CASA 29/18 — Civil Aviation (Fuel Requirements) Instrument 2018

The instrument organises fuel regulation around a small number of operationally meaningful concepts. These are defined terms used throughout the instrument and they determine what must be carried, how it is calculated and how pilots and operators must act during flight.

Key defined concepts

• Usable fuel required for flight. Determination requires aircraft‑specific fuel consumption data and operating conditions, including potential for deviations from planned flight (s 4). The data sources may be a fuel consumption monitoring system, manufacturer data, or other defined sources referenced in later provisions such as s 10.
• Components of required fuel. The instrument breaks required fuel into discrete components: taxi fuel, trip fuel, holding fuel, variable fuel reserve, fixed fuel reserve, alternate fuel and additional fuel (s 5(2)-(4); definitions in s 2). Each component has a functional purpose. For example fixed fuel reserve is expressly calculated for a 1 500 foot holding period in ISA conditions and must be usable fuel remaining until final landing (definition of fixed fuel reserve in s 2).
• Decision point. A point en route at which the aircraft can either continue to destination if adequate fuel remains or divert to an en‑route alternate if not (definition in s 2). The instrument prescribes what fuel components apply from a decision point (s 5(3)).
• Variable fuel reserve. For many operations this is a percentage of trip fuel specified in Table 1. For RPT/charter aeroplane flights the variable fuel reserve is the higher of the percentage or an amount to fly for 5 minutes at holding speed at 1 500 feet over destination in ISA (definition in s 2 and note to Table 1).
• Alternate fuel and alternate aerodromes. Alternate fuel is calculated as a sequence allowing a missed approach at destination, the routing to the destination alternate, approach and landing there (definition in s 2). Alternate aerodrome is defined with specific criteria including availability of necessary services and that aircraft performance requirements can be met (definition in s 2). The instrument specifically warns that its meaning of alternate aerodrome differs from the meaning in regulation 2 of CAR (note in definition of alternate aerodrome).
• Additional fuel. A supplementary amount to allow the aircraft, if engine failure or loss of pressurisation at the most critical point, to proceed to an alternate, hold for 15 minutes at 1 500 feet in ISA, and land (definition in s 2). The definition includes an express note that planning to minimal levels may place the aircraft in a fuel emergency if such an event occurs.

Table 1 and classification

• The instrument uses a single table to align fixed reserve and variable reserve by aircraft category, flight rules and class of operation (s 5(6) Table 1). Categories include small aeroplane (≤5 700 kg), large aeroplane (>5 700 kg), turbojet or large turboprop, helicopters, and airships. Class of operation separates RPT and charter from other operations, with higher variable reserves in many RPT/charter entries.
• Table 1 outcomes are prescriptive. Example entries include small piston/turboprop aeroplane day VFR fixed reserve 30 minutes with no variable reserve, and for RPT/charter piston aeroplanes the fixed reserve is 45 minutes and variable reserve 10 per cent (Table 1).

Operational variation concept

• A pathway for AOC and Part 141 operators to adopt alternative calculation methods for taxi, trip, variable reserve, alternate fuel and additional fuel, and in a limited case fixed fuel reserve for aerial work with only flight crew. The variation must be documented in the operator’s operations manual and supported by evidence that safety is maintained or improved (s 8(1)-(5)).
• Required evidence is either documented in‑service experience or the results of a specific safety risk assessment. The latter must include flight fuel calculations and demonstrate capabilities including a data‑driven fuel consumption monitoring programme, sophisticated alternate selection techniques and specific risk mitigations (s 8(4)-(5)).
• Where evidence is provided, the operations manual prevails over inconsistent provisions of this instrument to the extent of the inconsistency (s 8(6)-(7)). There is a transitional concession for pre‑existing operational variations until AOC expiry or 12 months after commencement (s 8(8)-(9)).

Pilot and operator procedural framework

• Pre‑flight: the pilot in command must ensure a pre‑flight determination of usable fuel is conducted (s 6(1)). Certificate holders must record pre‑flight fuel quantities and keep procedures for recording checks during flight (s 6(3)).
• In‑flight: pilots must perform interval fuel checks, compare planned consumption with actual and determine whether remaining fuel suffices to meet s 5(3) and s 5(4) standards (s 6(2)).
• If expected arrival fuel falls below specified thresholds, the pilot must take prescribed actions including consulting ATC about delays, diverting to ensure landing with at least the fixed reserve, advising ATC of minimum fuel when appropriate, and declaring emergency fuel when remaining predicted fuel at the nearest safe landing aerodrome is less than the fixed reserve (s 7(1)-(5)).

Sector and special rules

• EDTO operations remain subject to CAO 82.0 Appendix 5 clause 6 in addition to this instrument (s 9).
• Remote island passenger and medical transport flights have special minimum safe fuel rules, including direct references to data source hierarchies and flight manual/performance data for transport category and other aeroplanes (s 10).
• Sailplane charter operators must ensure engine operation whenever out of gliding range of departure aerodrome (s 11).

Taken together, these concepts establish a structured, componentised approach to fuel planning and monitoring, with operator manualisation and CASA oversight as the primary compliance mechanisms, and clear in‑flight decision rules vested in the pilot in command.

The instrument applies broadly to all Australian aircraft subject to limited, express exceptions. The primary affected parties are:

• Operators. Defined to include certificate holders such as Part 141 operators and holders of an AOC, and other operators of Australian aircraft. Operators have obligations under multiple provisions: to ensure flights carry the fuel required by s 5; to ensure usable fuel determinations are made using the matters listed in s 4; to incorporate procedures and, where relevant, operational variations into their operations manual; and to provide CASA with evidence supporting operational variations (s 4; s 5; s 6(3); s 8).
• Pilots in command. The instrument places a number of duties directly on the pilot in command. These include ensuring pre‑flight fuel determinations are made (s 6(1)); carrying specified fuel components at flight commencement and after decision points (s 5(2)-(4)); performing regular in‑flight fuel checks and evaluating remaining usable fuel against the requirements of s 5(3) and s 5(4) (s 6(2)); reanalysing and adjusting plans when fuel is used for other purposes post‑commencement (s 5(5)); and following prescribed procedures when fuel is below specified levels including diversion and the declaration of MINIMUM FUEL and emergency fuel states (s 7).
• AOC and Part 141 certificate holders. These entities are afforded the option to include operational variations in their operations manual for certain fuel calculations (s 8(1)-(2)). They must demonstrate to CASA how such variations maintain or improve safety by providing evidence such as documented in‑service experience or a specific safety risk assessment (s 8(4)-(5)). They are subject to special transitional rules if they had pre‑existing variations before commencement (s 8(8)-(9)).
• Flight crew engaged in aerial work operations. There is a narrow allowance for an operational variation to calculate fixed fuel reserve where the only occupants are flight crew members (s 8(2)). This affects operators and their flight crews conducting aerial work where weight and range trade‑offs are common.
• Passenger‑carrying and medical transport aeroplane operators to remote islands. AOC holders conducting these operations must either follow their operations manual’s minimum safe fuel provision or, if none is provided, follow the prescribed calculation method in s 10. The instrument names four remote islands where the special rule applies: Christmas Island, Cocos (Keeling) Islands, Lord Howe Island and Norfolk Island (s 10(1) and definition of remote island in s 2).
• Sailplane operators on charter operations. Power‑assisted and powered sailplane charter operators and pilots are subject to a specific duty to carry enough fuel to operate the engine whenever out of gliding range of the aerodrome of departure (s 11). There is an exemption for private operations in sailplanes that comply with CAO 95.4 (s 3(2)-(3)).

Indirectly affected parties

• Air traffic control. The instrument places an obligation on pilots to request delay information from ATC when unforeseen factors may cause shortages (s 7(2)) and to advise ATC of MINIMUM FUEL states (s 7(4)). The instrument’s notes make clear that a MINIMUM FUEL call is not an emergency request for priority handling and that ATC is likely only to advise or coordinate expected delays (note to s 7(4)).
• CASA. The regulator is the recipient of evidence for operational variations and the arbiter of whether an operations manual can prevail to the extent of inconsistency with the instrument (s 8(4), (6)-(7)). CASA’s role is structural to the instrument even though enforcement mechanisms are found elsewhere in the civil aviation legislative framework.
• Maintenance and engineering. Operators must factor the effects of deferred maintenance items and configuration deviations into fuel planning (s 4(b)(v)). Maintenance choices can therefore have downstream fuel planning and operational implications.

Who does not bear the instrument’s obligations

• Private sailplane operations that comply with CAO 95.4 are excluded from application (s 3(2)). Charter sailplane operations are excluded from the instrument, other than s 11 (s 3(3)). These narrow carve‑outs limit some sailplane activities from the instrument’s scope.

In short, the instrument sets operator‑facing and pilot‑facing duties across the domestic aviation sector, with heightened procedural and evidentiary obligations for certificate holders, special provisions for certain island operations and narrow exemptions for specific sailplane activities.

The instrument allocates duties primarily to operators and pilots in command. It also creates limited procedural rights, notably the ability of AOC and Part 141 operators to pursue operational variations.

Operator duties

• Ensure aircraft carry the fuel required by the instrument. Operators must ensure flights carry the sum of the components specified at flight commencement: taxi fuel, trip fuel, holding fuel where required, variable fuel reserve if specified by Table 1, alternate fuel if required, fixed fuel reserve and additional fuel where applicable (s 5(1)-(2)).
• Use appropriate data and consider operational factors in planning. The operator must base usable fuel determinations on current aircraft‑specific fuel consumption data (monitoring systems if available, or manufacturer data) and consider operating conditions such as weight, NOTAMs, meteorological forecasts, ATC procedures and deferred maintenance effects, as well as the potential for unforeseen deviations (s 4).
• For AOC/Part 141 holders, maintain operations manuals that contain instructions and procedures for recording fuel quantities before flight and after in‑flight checks. The operations manual is the locus of procedural compliance (s 6(3); s 8(1)).
• If relying on an operational variation, provide CASA with evidence showing the variation maintains or improves safety. Evidence may be documented in‑service experience or a specific safety risk assessment meeting the criteria in s 8(5). The specific safety risk assessment must include flight fuel calculations and demonstrable organisational capabilities such as a data‑driven fuel consumption monitoring programme (s 8(4)-(5)).

Pilot in command duties

• Pre‑flight determination. The pilot in command must ensure a determination of usable fuel on board is conducted before flight commencement (s 6(1)).
• Carry required fuel components. At flight commencement, from a decision point and at any time to continue safely, the pilot must ensure the aircraft carries the components specified in s 5(2)-(4).
• Perform in‑flight checks. During flight the pilot must ensure fuel quantity checks are performed at regular intervals, compare planned versus actual consumption, determine whether remaining fuel suffices to complete the planned flight in accordance with s 5(3) and s 5(4), and determine expected usable fuel on arrival (s 6(2)).
• Reanalyse when fuel is used for unplanned purposes. If fuel is used for a purpose other than planned after commencement, the pilot must reanalyse and, if applicable, adjust the planned flight (s 5(5)).
• Implement contingency procedures. If during an in‑flight check the predicted fuel on arrival is less than alternate plus fixed reserve or less than fixed reserve, the pilot must consider operational conditions and select appropriate alternates or divert to ensure a safe landing with not less than fixed fuel reserve remaining (s 7(1), (3)).
• Communicate fuel states. The pilot must request delay information from ATC when unforeseen factors may result in landing with less than required reserves, advise ATC of MINIMUM FUEL when appropriate and declare emergency fuel by broadcasting MAYDAY FUEL where predicted usable fuel at the nearest safe landing aerodrome is less than fixed reserve (s 7(2), (4)-(5)).

Rights and flexibilities

• Operational variation pathway. AOC and Part 141 operators have the right to propose operational variations for specified fuel calculations, subject to evidentiary requirements. If the operator meets those requirements, the operations manual may prevail where there is an inconsistency with the instrument (s 8(1), (4)-(7)). This creates a structured right to regulatory tailoring for sophisticated operators who can provide the required safety evidence.
• Transitional relief. Operators with existing operational variations in their operations manual immediately before commencement are taken to have met the evidence requirement until their AOC or Part 141 certificate expires or for 12 months after commencement, whichever occurs earlier (s 8(8)-(9)). This preserves continuity for pre‑existing practices while requiring future compliance or evidence.
• Choice of data sources for remote island flights. For passenger and medical transport flights to remote islands, operators have an ordered choice of data sources for fuel performance and consumption data, prioritising flight manual performance data for transport category aeroplanes and listing alternative acceptable sources for non‑transport category aeroplanes including manufacturer data, flight manual, operations manual, pilot operating handbook, or engine manufacturer data, with an option for approved flight testing where none of those sources apply (s 10(3)-(7)).

Prohibitions and limits

• No operational variations for holding fuel or fixed fuel reserve except a narrow exception. A certificate holder’s operations manual must not include an operational variation for holding fuel or fixed fuel reserve, except for a prescribed aerial work case where fixed reserve variations are permitted if only flight crew are on board (s 8(2)-(3)).
• Mandatory recording for certificate holders. AOC and Part 141 certificate holders must include instructions for recording pre‑flight and in‑flight fuel checks in their operations manual (s 6(3)).

Overall, duties are structured to place tactical flight decisions with the pilot in command, planning and procedural obligations on the operator, and to offer a conditional, evidence‑based right for certificate holders to vary certain numerical calculations where they can demonstrate equivalent or better safety.

The instrument is a legislative instrument made under regulation 234 of the Civil Aviation Regulations 1988, as stated in the making clause and the signature block. It prescribes mandatory duties and minimum standards for fuel planning, monitoring and in‑flight action. However, the instrument itself does not set out civil or criminal penalties, nor does it describe detailed enforcement steps such as infringement notices or suspension mechanisms.

What the instrument does establish

• Legal obligations. The instrument creates binding requirements on operators and pilots, including duties to carry specified fuel components, to conduct and record fuel determinations and checks, to follow specified in‑flight procedures when fuel states fall below defined thresholds, and for certificate holders to supply evidence to CASA for operational variations (s 4-8).
• CASA’s evidentiary gateway. The instrument formally channels operational variation applications through CASA by requiring certificate holders to give CASA evidence of documented in‑service experience or results of a specific safety risk assessment to demonstrate that the variation will maintain or improve aviation safety (s 8(4)). This is a regulatory mechanism for CASA oversight.

Where enforcement and sanctions are located

• Enabling law reference. The instrument is made under CAR reg 234, and it cross‑references other instruments and orders such as CAO 82.0 for EDTO (s 9). The instrument therefore operates within the broader Commonwealth aviation regulatory regime. Specific enforcement remedies, sanctions, offences and administrative actions are provided in the Civil Aviation Act 1988, the Civil Aviation Regulations 1988 and related legislative instruments and orders rather than in this instrument itself.
• Administrative oversight expected. Because the instrument requires operators to provide evidence to CASA and to include procedural material in operations manuals, CASA is placed in an administrative oversight role, with authority to assess compliance and evidence. The instrument does not specify how CASA will exercise that authority or the procedural steps and timelines it will use in approving or rejecting operational variations.

Practical implications

• Non‑compliance is an obligation breach. Because the instrument imposes duties on operators and pilots, failure to meet those duties will give rise to non‑compliance with a legislative instrument made under CAR reg 234. The instrument does not itself enumerate penalties, but failure to comply is likely to invoke enforcement mechanisms available under the Civil Aviation Act or CAR as applicable. The instrument’s text does not identify specific penalties, infringement amounts, or administrative processes.
• Evidence submission is a compliance step. For AOC and Part 141 operators seeking operational variations, compliance includes preparing and submitting either documented in‑service experience or a specific safety risk assessment that satisfies the requirements at s 8(4)-(5). The instrument sets minimum content for the assessment and therefore creates an enforceable standard for what CASA will examine.
• Recordkeeping and manual content as supervisory levers. The instrument makes an operator’s operations manual a compliance instrument. Certificate holders must include specific recording procedures and may have their operations manual prevail where acceptable evidence has been provided (s 6(3); s 8(7)). CASA’s review of manuals and evidence is a practical compliance point where regulatory oversight is exercised.

Limitations in the instrument

• No explicit penalty schedule. The instrument does not itself list numeric fines, demerits or suspension processes. Users seeking detail on sanctions must therefore consult the Civil Aviation Act 1988 and the Civil Aviation Regulations 1988 for how contraventions of legislative instruments and regulatory obligations are treated.
• Discretion and enforcement practice outside the instrument. The instrument establishes duties and evidentiary gateways but leaves the practical contours of enforcement , such as inspection regimes, notices to remedy, suspension of certificates, or prosecutions , to the broader statutory and administrative framework.

In summary, the instrument creates clear legal duties and an administrative interface with CASA for operational variations. It does not itself contain a penalty regime. Enforcement and sanctions will therefore depend on the wider civil aviation legislation and administrative enforcement practices not set out in this text.

This instrument sits within the Australian civil aviation legislative architecture and makes multiple explicit cross‑references to other instruments and definitions. The interaction points determine where obligations stack, where primacy may arise and which documents or standards are to be used as primary data sources for fuel calculations.

Legal basis and cross‑references

• Enabling regulation. The instrument is made under regulation 234 of the Civil Aviation Regulations 1988, as stated on its face. That places it as a legislative instrument subordinate to the Civil Aviation Regulations and the Civil Aviation Act 1988 in the legislative hierarchy (instrument header and signature block).
• Definition cross‑references. Section 2 expressly states that other expressions used in this instrument have the same meaning as in the Civil Aviation Act 1988, CAR and CASR. For example, AOC is defined in section 3 of the Civil Aviation Act, and I.F.R. and V.F.R. are defined in CAR regulation 2 (see notes 1 and 2 to s 2). This aligns the instrument’s defined terms with the broader framework.
• CAO interaction. The instrument explicitly cross‑references CAO 82.0 in two ways. First, it adopts the EDTO definition from CAO 82.0 and makes AOC holders carrying out EDTO subject to clause 6 of Appendix 5 to CAO 82.0 in addition to this instrument (s 2 definition of EDTO; s 9). Second, the instrument includes an operational variation carve‑out that references CAO provisions for certain sailplane definitions (s 2 definitions where applicable).
• Operational manual primacy. Section 8(7) creates an interactional rule: if a certificate holder’s operations manual contains an operational variation and the holder has met the evidentiary requirement, and there is an inconsistency between the instrument and the operations manual, the operations manual provision prevails to the extent of the inconsistency. That creates a legal relationship where, for compliant certificate holders, their manual can operate as the practical standard in place of the instrument for specified calculations.
• CAO authorisation conditions. Section 10 contains a note pointing out that AOCs authorising certain operations are subject to a condition that passengers must not be carried on flights to remote islands unless the aeroplane is carrying not less than the minimum safe fuel for the flight, citing paragraph 3A.1 of CAO 82.0. This demonstrates that the instrument’s requirements for remote island operations operate alongside CAO conditions on AOCs.

Data and performance standards cross‑references

• Flight manuals and POH. For remote island flights, the instrument mandates the use of performance data and fuel consumption data from the flight manual for transport category aircraft (s 10(3)). For other aeroplanes it lists acceptable data sources including manufacturer performance data, flight manual, operations manual/exposition, pilot operating handbook or engine manufacturer data (s 10(4)-(5)). If none of those apply, approved flight testing is the residual method (s 10(7)). Thus the instrument links its calculations to established airworthiness and operational documents.
• ICAO standard atmosphere. The instrument operationalises the ISA concept and requires calculation of holding and fixed reserve against ISA conditions as described in ICAO Document 7488 , Manual of the ICAO Standard Atmosphere (s 2 definition of ISA). This ties certain numeric requirements to an internationally referenced standard.

Limits and special relationships

• Different meaning for alternate aerodrome. The instrument includes a note that its definition of alternate aerodrome is different from the meaning of that expression as defined in CAR regulation 2 (note to definition of alternate aerodrome in s 2). This is a specific qualification that users must attend to when reconciling obligations between instruments.
• Narrow carve‑outs. The instrument excludes private sailplane operations that comply with CAO 95.4 and excludes charter sailplane operations from its requirements except for s 11 (s 3(2)-(3)). This establishes boundaries between CAO 95.4 and this instrument for certain sailplane activities.
• CAO Appendix link for EDTO. The instruction that AOC holders conducting EDTO must comply with CAO 82.0 Appendix 5 clause 6 as in force from time to time creates a standing link that imports evolving CAO requirements into the operator’s obligations under this instrument (s 9).

Operational impact of interactions

• Operations manual as a compliance hub. Because the instrument requires operations manuals to carry procedures and allows an approved operations manual to prevail in certain cases, operators must ensure that their manuals align with CAO 82.0, the Flight Manual and other referenced materials. Manuals therefore become the practical point of intersection for multiple instruments.
• Regulatory layering for RPT, charter and EDTO. RPT and charter operations encounter heightened variable reserves in Table 1 and may face additional CAO requirements. EDTO flights must satisfy both this instrument and CAO 82.0 technical EDTO standards. Operators in those sectors must manage layered compliance obligations.
• Data hierarchy for remote islands. The specific data source hierarchy in s 10 ensures that fuel performance for remote island flights aligns with manufacturer and flight manual data where available, but provides alternative options where the ideal source is not available, and a flight test fallback where none of the listed sources exist. This mitigates regulatory gaps but requires operators to document their chosen data source and, where relevant, test results.

In sum, the instrument operates as part of an integrated regulatory architecture. It sets stand‑alone fuel obligations but expects operators to coordinate those obligations with operations manuals, CAOs, flight manuals and other statutory instruments. Where conflicts arise and an approved operational variation exists, the operations manual may displace the instrument to the limited extent described.

The instrument as provided records its making date and commencement linkage but does not show subsequent amendments within the provided text. The documentary facts in the instrument are the following:

• Made by. The instrument is identified as CASA 29/18 , Civil Aviation (Fuel Requirements) Instrument 2018 and was made by Graeme Mills Crawford, Acting Director of Aviation Safety on behalf of CASA, signed and dated 17 May 2018. The face of the instrument includes the standard making clause that it is made under regulation 234 of the Civil Aviation Regulations 1988.
• Commencement. Section 1A provides the commencement rule: the instrument commences immediately after the commencement of the Civil Aviation Amendment (Fuel and Oil Requirements) Regulations 2018. This ties the effective date to the commencement of the amending regulations, rather than to the instrument’s own signature date.
• Transitional provisions. Section 8 contains transitional treatment for pre‑existing operational variations: if an operations manual contained an operational variation immediately before commencement, the certificate holder is taken to have met the evidentiary requirement for that variation until the earlier of the holder’s current AOC or Part 141 certificate expiry or 12 months after commencement (s 8(8)-(9)). This is an explicit transitional clause preserving continuity for holders with pre‑existing policy settings.
• No subsequent amending schedules present. The text provided contains no Schedule of amendments or a history table identifying subsequent amendments or revocations. It does not contain a repeal clause or express savings beyond the transitional rule in s 8.

Implications for researching amendments

• External amendment tracking required. To determine whether the instrument has been amended since its 2018 making, or whether the linked Civil Aviation Amendment (Fuel and Oil Requirements) Regulations 2018 or CAO 82.0 have been amended subsequently in ways that affect this instrument, a practising lawyer or compliance professional must consult the Federal Register of Legislation, CASA registers, and current versions of the Civil Aviation Regulations and CAOs. The instrument text itself does not include later amending material.
• CAO and CAR changes relevant. Because the instrument cross‑references other instruments that are updated from time to time (for example CAO 82.0 is referenced in s 9 as applying "as in force from time to time"), amendments to those instruments will change compliance obligations without amending this instrument. Tracking those instruments is therefore essential.
• Operations manual transitions. The transitional 12 month relief for pre‑existing operational variations means there was an implementation window after commencement for certificate holders. That window may have closed unless later amended. Operators should confirm whether any additional transitional arrangements have been issued by CASA post‑commencement.

Records to keep for amendment history purposes

• Original instrument date and commencement linkage should be recorded for compliance tracing.
• Documentation of any evidence submitted to CASA under s 8, and any CASA acceptance or correspondence, should be maintained to demonstrate whether an operations manual variation was accepted and hence whether operations manual provisions prevail (s 8(4), (6)-(7)).
• Any updated editions of CAO 82.0, flight manuals or the Civil Aviation Regulations that post‑date this instrument and alter referenced provisions should be tracked and annotated.

In the absence of further amendment text in the instrument supplied, the instrument stands as initially made on 17 May 2018 with the transitional provisions noted. Users should consult consolidated legislative sources for any changes since that date.

The instrument as provided does not include any judicial material or references to case law. It names no decisions, and there is no litigation history recorded within its text.

What the instrument records relevant to litigation potential

• Regulatory obligations without penalty clauses. The instrument imposes duties on operators and pilots but does not itself set out penalties or enforcement mechanisms. Any litigation or tribunal proceedings arising from alleged contraventions would therefore be brought under the Civil Aviation Act 1988, the Civil Aviation Regulations 1988, or other applicable statutory instruments and common law, rather than under an internal penalty schedule in this instrument. The instrument’s text does not include a declaratory clause about remedies or dispute resolution.
• CASA evidentiary gateway and potential review. Because the instrument requires certificate holders to give CASA evidence when proposing operational variations and because operations manuals may prevail where evidence is accepted (s 8(4), (6)-(7)), disputes could arise about the adequacy of evidence, the scope of an operator’s operations manual, or CASA’s administrative decisions. Any administrative decisions by CASA in this area may be reviewable under administrative law, but the instrument does not record any judicial treatment of such disputes.
• Aviation‑specific CAO and CAR references. The instrument imports CAO and CAR meanings and obligations. Litigation involving interpretation of the instrument may therefore require judicial consideration of how it interacts with CAR definitions and CAO content. The instrument includes an explicit note that the expression "alternate aerodrome" has a different meaning here than in regulation 2 of CAR, which could be a point of legal argument where operational or enforcement outcomes depend on that meaning (note to definition of alternate aerodrome in s 2).

Practical caution for researchers

• No named cases. Because the instrument does not name cases and contains no internal litigation history, researchers should search judicial and administrative review databases, and CASA enforcement records, to find any decisions involving the instrument post‑2018.
• Administrative decisions likely to be first instance. Challenges to CASA decisions about operational variations, approvals, or interpretations of the instrument will likely be administrative in character and may proceed to merits review or judicial review depending on the nature of the decision. The instrument does not itself set out a dispute resolution mechanism.

In short, the instrument’s text contains no litigation history. Any litigation or review relating to its obligations will be found in external case law or administrative review records that are not reproduced in the instrument.

Several features of the instrument are easy to misread or to overlook in practice. These are points where practical application commonly generates compliance risk or operational friction.

1. Operations manual can prevail where an operator has satisfied CASA. Section 8(7) provides that if a certificate holder’s operations manual includes an operational variation and the holder meets the evidence requirement, then where there is an inconsistency between the instrument and the manual, the operations manual provision prevails to the extent of the inconsistency. It is a two‑step gate: the manual must contain the variation and the holder must have given CASA the required evidence that demonstrates safety equivalence or improvement (s 8(6)-(7)). Operators who assume their manual automatically overrides the instrument without CASA evidence will be mistaken.

2. Narrow limits on operational variations. Not all fuel components may be varied. Subsection 8(3) prohibits operational variations relating to holding fuel or fixed fuel reserve, except for a narrow aerial work case in s 8(2). Operators seeking to reduce required fixed reserves or holding fuel will generally not be permitted to do so by means of an operational variation.

3. Table 1 specifics and RPT/charter differences. Table 1 increases variable reserves and fixed reserves for RPT and charter operations in many cases. For example, a piston aeroplane used for RPT/charter requires a 45 minute fixed reserve and a 10 per cent variable reserve, whereas a non‑RPT small piston aeroplane by day VFR requires only 30 minutes fixed and no variable reserve (Table 1). Misclassifying an operation can therefore materially understate required reserves.

4. Different legal meaning of "alternate aerodrome". The instrument explicitly warns that its meaning of alternate aerodrome differs from CAR regulation 2 (note to definition of alternate aerodrome in s 2). Operators and pilots must use the instrument’s definition when applying its requirements, not the CAR definition, to avoid miscalculation of alternate requirements.

5. The variable fuel reserve for RPT/charter aeroplanes is the higher of two measures. The instrument’s definition of variable fuel reserve states that for RPT and charter aeroplane operations it is the higher of the percentage in Table 1 and an amount to fly for 5 minutes at holding speed at 1 500 feet above destination in ISA conditions. Practically, this means that for short trips with small trip fuel, the 5 minute holding floor can exceed the percentage‑based reserve, so the percentage alone is not sufficient to assess required carry.

6. "Additional fuel" safety note. The definition of additional fuel explicitly warns that planning in accordance with s 5(2)-(4) may place the aircraft in a fuel emergency if an engine failure or loss of pressurisation occurs at the most critical point. The instrument therefore recognises that compliance with the minimum components can still produce a fuel emergency under certain failure scenarios, and provides the additional fuel concept to cover those contingencies. Operators should not assume that carrying the minimum list necessarily ensures avoidance of an emergency in all failure modes.

7. Pilot declaration semantics. The instrument distinguishes between MINIMUM FUEL and emergency fuel. The MINIMUM FUEL declaration informs ATC of a fuel‑tight situation but is not a request for priority handling and does not equate to an emergency. By contrast, the emergency fuel declaration, communicated by broadcasting MAYDAY FUEL, is a distress message and indicates that landing with less than fixed reserve at the nearest safe aerodrome is likely (s 7(4)-(5) and notes). Misusing these terms can lead to miscommunication with ATC and inappropriate expectations.

8. Remote island calculation hierarchy. For passenger‑carrying and medical transport flights to the enumerated remote islands, the instrument gives priority to the operations manual’s minimum safe fuel if it exists. Only where the manual does not provide a calculation does the instrument prescribe a fallback calculation using flight manual or manufacturer data, or flight tests if no data sources are available (s 10). Operators who assume the instrument’s numerical fallback always applies may miss the fact that their own operations manual may be the controlling source.

9. Recording duties for certificate holders. AOC and Part 141 certificate holders must include in their operations manual instructions and procedures for recording pre‑flight fuel quantities and post‑check fuel quantity evaluations (s 6(3)). Failure to embed these processes in the manual is not a technicality; it undermines the instrument’s recordkeeping expectations and any operational variation claims.

10. Transitional relief expiry trap. Certificate holders with pre‑existing operational variations are deemed to have met the evidence requirement until AOC/Part 141 expiry or 12 months after commencement, whichever occurs earlier (s 8(8)-(9)). After that date, operators must have substantive evidence on file. Relying on the transitional deeming past its expiry can expose the holder to non‑compliance.

11. EDTO overlay. If a flight is an EDTO, the AOC holder must also comply with CAO 82.0 Appendix 5 clause 6 as in force from time to time (s 9). EDTO imposes independent technical requirements which can affect fuel planning and equipment mandates. Failing to integrate CAO EDTO rules with this instrument can create an incompletely compliant fuel plan.

12. Fuel monitoring capability requirement for variation. The specific safety risk assessment required to support an operational variation must include a data‑driven fuel consumption monitoring programme and sophisticated techniques for selecting alternates (s 8(5)). Operators without such technical capability should not expect their assessments to meet the instrument’s content mandate.

These items are practical traps or frequently overlooked interactions that can lead to operational non‑compliance or regulatory friction. Operators should treat the instrument as setting minimum numeric rules plus procedural and evidentiary obligations that tie closely to operations manual content and CASA oversight.

Compliance with the instrument is operational and document driven. The following is a practical, source‑grounded compliance checklist organised by actor: AOC/Part 141 certificate holders, other operators, and pilots in command. Each step cites the relevant provisions.

For all operators

1. Understand the scope. Confirm whether the operation is within the instrument’s application. The instrument applies to all Australian aircraft subject to narrow exceptions for private sailplane operations that comply with CAO 95.4 (s 3(1)-(3)). For charter sailplane operations, s 11 applies even where the instrument otherwise does not.

2. Base fuel calculations on required data. Use current aircraft‑specific fuel consumption data or manufacturer data and account for operating conditions such as anticipated weight, NOTAMs, meteorology, ATC procedures, deferred maintenance effects and potential deviations (s 4). Document the data sources used for each flight.

3. Plan to carry the components required at flight commencement and from decision points. At flight commencement the aircraft must carry taxi fuel, trip fuel, holding fuel as required, variable fuel reserve if Table 1 specifies it, alternate fuel if required, fixed fuel reserve and additional fuel if applicable (s 5(2)). From decision points and at any time to continue safely, apply the analogous component list in s 5(3)-(4).

4. Apply Table 1 to determine fixed and variable reserves. Consult s 5(6) Table 1 to determine the fixed fuel reserve and the applicable percentage variable reserve by aircraft type, flight rules and class of operation. For RPT/charter aeroplane operations, remember the variable reserve is the higher of the percentage and a 5 minute holding floor in ISA at 1 500 feet (note to Table 1 and definition of variable fuel reserve in s 2).

5. Perform pre‑flight and in‑flight checks per s 6. Ensure a pre‑flight determination of usable fuel is completed before flight commencement (s 6(1)). During flight conduct interval checks to compare planned versus actual consumption, determine sufficiency against s 5(3) and s 5(4) and estimate expected fuel on arrival (s 6(2)). Record checks as required.

For AOC and Part 141 certificate holders

1. Update operations manual. Include instructions and procedures for recording pre‑flight fuel quantities and the evaluation after each in‑flight fuel check (s 6(3)). If intending to use an operational variation, document the variation in the operations manual (s 8(1)).

2. If seeking an operational variation, prepare evidence for CASA. Provide CASA with at least one of: documented in‑service experience or the results of a specific safety risk assessment that meets s 8(5). The safety risk assessment must include flight fuel calculations and demonstrate capabilities including a data‑driven fuel consumption monitoring programme, sophisticated alternate selection techniques and specific risk mitigations (s 8(4)-(5)).

3. Note scope limits. Do not include operational variations for holding fuel or fixed fuel reserve in the operations manual, except the narrow aerial work case where only flight crew are carried (s 8(2)-(3)).

4. Take advantage of transitional relief where applicable. If the operations manual already contained an operational variation immediately before commencement of the instrument, the certificate holder is treated as having met the evidence requirement until AOC or Part 141 certificate expiry or 12 months after commencement, whichever is earlier (s 8(8)-(9)). Do not rely on transitional relief past its expiry.

5. If evidence is accepted by CASA, understand manual primacy. Once the holder has met the evidentiary requirement, the operations manual provision prevails over inconsistent instrument provisions to the extent of the inconsistency (s 8(7)). Keep records of CASA correspondence and approvals to evidence this status.

For remote island operations (passenger‑carrying and medical transport)

1. Identify remote island status. The instrument identifies four remote islands: Christmas Island, the Cocos (Keeling) Islands, Lord Howe Island and Norfolk Island (definition of remote island in s 2). If conducting passenger or medical transport to any of these, follow s 10.

2. Use the operations manual calculation if present. The minimum safe fuel is the amount the operator’s operations manual requires for such a flight if the manual makes provision (s 10(1)(a)). Ensure the manual’s method is aligned with the instrument and CAO conditions.

3. If no manual provision exists, apply the instrument’s calculation. The instrument sets two alternative minimum amounts (s 10(2)(a)-(b)), including a performance‑based calculation for engine intact and a failure‑scenario calculation including 15 minutes holding at 1 500 feet in ISA. Use flight manual performance and fuel consumption data for transport category aircraft (s 10(3)). For other aeroplanes, follow the hierarchy in s 10(4)-(5) and perform flight testing if no data sources are available (s 10(7)). Document the chosen data source and calculations.

For pilots in command

1. Conduct pre‑flight fuel determination. Confirm usable fuel quantity before flight commencement as required by s 6(1). Retain or ensure the operator retains the record if the flight is under a certificate holder (s 6(3)).

2. Perform in‑flight fuel checks and act on them. During flight, check fuel at regular intervals and evaluate planned versus actual consumption and expected arrival fuel (s 6(2)). If expected usable fuel on arrival is less than required alternate fuel plus fixed reserve or less than fixed reserve, comply with the diversion and notification obligations in s 7(1)-(3).

3. Notify ATC appropriately. Request delay information from ATC where unforeseen factors may cause arrival with less than required reserves (s 7(2)). Advise ATC of MINIMUM FUEL when committed to land and a change could result in landing with less than fixed reserve (s 7(4)). Declare emergency fuel by broadcasting MAYDAY FUEL when calculated usable fuel to the nearest safe aerodrome is less than fixed reserve (s 7(5)).

4. Reanalyse when fuel is used for other purposes. If fuel is consumed for a purpose other than planned after flight commencement, reanalyse and adjust the planned flight accordingly (s 5(5)).

Documentation and audit readiness

• Retain the data sources used for fuel planning including fuel consumption monitoring outputs, manufacturer data, flight manual extracts, NOTAMs, meteorological forecasts, and ATC delay information used in decision making (s 4; s 6(3)).
• Ensure operations manuals reflect current practice and that any operational variation is documented with the evidence submitted to CASA. Keep the evidence package and CASA responses on file to demonstrate compliance in audits (s 8(4)-(7)).
• Maintain records of in‑flight fuel checks. For certificate holders, procedures must be in the operations manual for recording pre‑flight fuel and after each in‑flight check, and those records should be preserved according to the operator’s normal recordkeeping regime (s 6(3)).

Operational risk mitigations

• Invest in a fuel consumption monitoring programme if seeking operational variations. The instrument requires a data‑driven monitoring programme as part of the specific safety risk assessment for operational variations (s 8(5)(i)).
• Use conservative alternates selection. The instrument requires "sophisticated techniques" for determining alternate aerodromes as part of the assessment for operational variations (s 8(5)(ii)). Maintain documented criteria and decision tools.
• Train flight crew on MINIMUM FUEL versus emergency fuel semantics and the required communications with ATC to avoid miscommunications under s 7(4)-(5).

Integration with other compliance obligations

• Include EDTO compliance where relevant. If conducting EDTO, integrate CAO 82.0 Appendix 5 clause 6 obligations with this instrument’s fuel planning to avoid gaps (s 9).
• Align operations manual provisions with any CAO conditions, especially for remote island passenger flights where CAO 82.0 contains specific AOC conditions (s 10 note).

This compliance checklist operationalises the instrument’s textual duties. Operators and pilots should maintain contemporaneous records of planning data, manual content, evidence submitted to CASA and in‑flight checks to demonstrate compliance with the instrument’s requirements.