The instrument relies on a small set of technical and procedural concepts drawn from the AD text.

1. Applicability by model and serial number: The AD lists specific models and serial number ranges to which it applies: 210G; 210H; 210J (SN 21058819 through 21059199); 210M; 210N (SN 21062274 through 21063025); T210G; T210H; T210J (SN T210-0198 through T210-0454 and 21058140); T210M; T210N (SN 21062274 through 21063025); and P210N (SN P21000001 through P21000141) (Applicability). Compliance is therefore not universal across all Cessna 210 variants, but linked to enumerated serial ranges.

2. Record-based compliance gate: The first required action is a documentary review of maintenance records to determine whether the aircraft already complies with specified prior directives (Requirement 1). If the records show compliance with FAA AD 78-26-12 (as in force from time to time) or the historical CASA AD/CESSNA 210/35 as it existed prior to its cancellation, then no further action is required (Note 3). The AD therefore uses the maintenance log as the primary compliance determinant.

3. Delegated technical content: The substantive technical remedy (what must be done if records do not show compliance) is not set out in full in the CASA AD text; instead the CASA AD requires operators to carry out the actions detailed in FAA AD 78-26-12 (Requirement 2). The CASA instrument therefore imports technical steps from that FAA AD, and makes those steps binding by reference, including an ongoing obligation to follow that FAA AD “as in force from time to time” (Note 2).

4. Limited scope of on-aircraft action allowance: The AD allows a ferry flight solely to reach a location where the inspection/actions may be accomplished, provided the pilot visually verifies that adequate fuel is available via the fuel filler neck (Note 5). The AD does not authorise unrestricted flights prior to compliance; it authorises a constrained single-purpose relocation.

5. Registered operator certification: The AD explicitly allows the registered operator to perform and certify the documentary determination in Requirement 1 if they hold at least a private pilot’s licence (Note 1). That narrows who may lawfully sign the compliance finding.

6. Reference materials: The AD cross-references FAA AD 78-26-12 and Cessna Service Letter SE78-69. The Background records that FAA AD 78-26-12 and Cessna Service Letter SE78-69 remain current, while CASA’s earlier AD/CESSNA 210/35 had been cancelled in 1980 with no available justification (Background). That creates a reliance on documents external to the CASA AD text for technical specifics and historical context.

Together these concepts create a two-step compliance mechanism: (a) a documentary check within a short deadline; and (b) where that check fails, the application of an external FAA AD’s maintenance actions prior to further flight. The CASA AD therefore privileges maintenance records as the compliance switch and channels technical remediation to the FAA AD and Cessna Service Letter.

The AD identifies the following affected parties directly in its text:

• Registered operators of the specified Textron Aviation (Cessna) 210-series aeroplanes whose model and serial numbers fall within the enumerated ranges (Applicability). Those operators are subject to the Requirement provisions and associated compliance timeframes.
• The registered operator may carry out and certify the records determination only if the registered operator holds at least a private pilot’s licence (Note 1). That creates a limited qualification for who may legally certify compliance under Requirement 1.
• Pilots who may perform a ferry flight to move an aircraft to a location where the inspection or remedial actions may be carried out, on the condition that they visually verify through the fuel filler neck that adequate fuel is available to complete the flight (Note 5). The AD therefore imposes a practical constraint on pilots who may be asked to relocate an aircraft for compliance purposes.

The AD does not state specific obligations for maintenance organisations, engineers, or other legal entities beyond the operator duty to make the records determination and, where necessary, to carry out the FAA AD actions. However, operators will in practice need to engage maintenance providers or follow their internal procedures to carry out the technical actions that the FAA AD prescribes (Requirement 2), because the CASA AD does not list technical steps itself but imports them. The AD also references Cessna Service Letter SE78-69 as relating to the subject, which may be material for owners or maintainers to consult (Requirement 1 Note 4; Background).

The AD affects only aircraft within the specific model and serial number ranges listed. Aircraft outside those ranges are not covered by this AD text as provided. The AD also affects the administrative process of compliance: it creates a short-term documentary review obligation (within 28 days of commencement) and a potential immediate technical obligation (prior to further flight) for aircraft without prior documented compliance.

The AD was signed by the CASA delegate (David Punshon) on 24 August 2021 and commenced on 3 September 2021 (Commencement; signature). Those dates set the compliance schedule for affected operators.

The AD establishes narrow, documentable duties and a few rights or limited permissions. These are stated in the AD text.

Duties:

• Records review duty: Within 28 days after the commencement date (commencement on 3 September 2021), the registered operator must review the aircraft’s maintenance records to determine whether those records show compliance with either FAA AD 78-26-12 (as in force from time to time) or CASA AD/CESSNA 210/35 as in force on the day prior to its cancellation (Requirement 1; Compliance: within 28 days after commencement). This is an affirmative documentary duty; the AD makes the records assessment the first compliance step.
• Remediation duty where records are lacking: For aircraft where records do not show compliance with either of those prior instruments, the operator must carry out the actions detailed in FAA AD 78-26-12 (Requirement 2). The AD couples the lack of documentary evidence to a mandatory technical remedy.
• Timing duty for remediation: The actions required by Requirement 2 must be completed before further flight of the aircraft (Requirement 2; Compliance: before further flight). That means an aircraft without documented prior compliance is not permitted to fly (except as allowed under the ferry provision) until the FAA AD actions have been satisfied.

Rights and limited permissions:

• Right to certify records determination: The AD permits the registered operator to accomplish and certify the determination required by Requirement 1, provided that person holds at least a private pilot’s licence (Note 1). This explicitly allows non-licenced maintenance engineers or other parties not meeting that threshold to be excluded from certifying the records review, and allows owners/operators with a private pilot’s licence to sign their own compliance finding.
• Ferry movement permission: The AD permits the aircraft to be flown to a location where the inspection or remedial action may be accomplished, subject to a pilot visually verifying through the fuel filler neck that adequate fuel is available to complete the flight (Note 5). The AD therefore authorises a constrained relocation flight in support of compliance work.

Imported obligations:

• Ongoing reference to FAA AD as in force: The phrase “as in force from time to time” attached to FAA AD 78-26-12 (Requirement 1 and Note 2) binds operators to the current version of the FAA AD at the time of compliance. That creates a duty to track the FAA AD’s status; the AD does not freeze the FAA AD to a particular snapshot, but imports future amendments insofar as they become the FAA AD’s current form.

References and informational items:

• The AD notes that Cessna Service Letter SE78-69 relates to the subject of this AD (Note 4; Background). While the CASA AD does not itself mandate the Service Letter, it points to it as relevant material for operators to consult when addressing the fuel quantity transmitter issue.

The AD does not specify administrative forms, fees, or further certification procedures in its text. It sets a short documentary deadline and a before-flight technical requirement, while permitting limited self-certification and constrained ferrying for compliance purposes.

The AD text provided contains specific compliance obligations and deadlines, but it does not set out express penalties, enforcement procedures, or sanctioning mechanisms within the text reproduced. The instrument requires documentary review within 28 days and remediation, where necessary, before further flight; it permits limited ferrying to achieve compliance (Requirements; Compliance; Notes). Beyond these operational commands, the AD does not list monetary fines, suspension provisions, or detailed enforcement steps in the material supplied.

Because the AD requires that actions from FAA AD 78-26-12 be carried out where records do not show prior compliance (Requirement 2), compliance is conditional and immediate for those aircraft without records. The phrase “before further flight” is a compliance standard that, in practice, freezes operations until remedial actions are complete or verified. The AD therefore creates an immediate operational constraint as a form of enforcement: aircraft without documented compliance must not be flown, except for a permitted ferry movement under Note 5. The ferry movement is strictly conditional on the pilot verifying adequacy of fuel visually through the filler neck for the relocation flight only.

The AD does not specify which CASA office or official is the point of enforcement, nor does it list the evidentiary standard for compliance records beyond the requirement to determine whether records show compliance with the referenced ADs. The AD also does not include a process for appeal, extension, or alternative compliance within the reproduced text. If an operator believes an alternative method provides an equivalent level of safety, the AD text supplied does not set out an approval pathway; the AD simply imports FAA AD actions and binds operators to their execution where records are absent.

In short, the AD imposes operationally consequential obligations (documentary review with a short deadline and a before-flight fixation on remediation) but does not, within the provided text, enumerate civil penalties, criminal sanctions, or administrative enforcement steps beyond its substantive compliance commands. The Background section documents the safety rationale for the requirement , the risk of incorrect fuel quantity indications due to excessive friction at the transmitter float arm pivot , which is the declared ground for the AD’s imposition (Background).

This CASA AD explicitly interacts with two external aviation safety instruments and a manufacturer service letter. The AD does not otherwise reference statutory provisions in the material provided.

1. Importation of FAA AD content: The AD requires compliance with FAA AD 78-26-12 “as in force from time to time” (Requirement 1; Note 2). By reference, CASA’s AD thereby imports the technical content and any future amendments of that FAA AD into the compliance obligations of Australian operators of the affected aircraft. This creates an operational cross-reference: the FAA AD’s current text will determine the technical steps required where an operator’s records do not show prior compliance. The CASA AD therefore depends on a foreign airworthiness directive for technical remediation.

2. Historical CASA AD: The AD also offers an alternative documentary path by asking whether maintenance records show compliance with “CASA AD/CESSNA 210/35, as in force on the day prior to its cancellation” (Requirement 1). The AD notes that AD/CESSNA 210/35 was cancelled in 1980 with no justification available (Background). The CASA AD therefore recognises the historical domestic AD as a potential basis for demonstrating compliance but does not rely on it as a live instrument.

3. Manufacturer communication: The AD notes that Cessna Service Letter SE78-69 “relates to the subject of this AD” (Note 4; Background). The CASA AD does not itself mandate the Service Letter’s actions, but references it as relevant. Operators and maintainers are directed by the AD to consult or be aware of that service letter for context.

4. Effect of “as in force from time to time”: The AD language that requires compliance with a document “as in force from time to time” creates an obligation to track changes in the referenced foreign instrument. Practically, that means if FAA AD 78-26-12 is amended at any point after the CASA AD’s commencement, the amended FAA AD becomes the current technical standard for operators compelled by the CASA AD’s cross-reference. The CASA AD therefore imports an adaptive technical standard, rather than a fixed snapshot.

The AD text does not itself describe how operators should reconcile conflicts between the FAA AD and any other domestic instrument beyond the two instruments it cites. It also does not set out a formal mechanism for CASA to accept alternative means of compliance or to grant exemptions , no such provision is contained in the provided text. Interactions with other regulatory instruments not cited in the AD (for example, national licensing or maintenance standards) are not described in the reproduced material and therefore cannot be asserted from this source.

The material supplied contains limited explicit amendment history, but it does provide discrete temporal markers and references to prior actions which together form the AD’s immediate historical context.

• The AD itself is identified as AD/CESSNA 210/76 , Fuel Quantity Transmitter, AD number 17/2021 (header). It was signed by David Punshon, Delegate of the Civil Aviation Safety Authority, on 24 August 2021 and commenced on 3 September 2021 (signature; Commencement). Those are the issuing dates for this AD.
• The Background section records that CASA previously addressed the potential unsafe condition via AD/CESSNA 210/35 , Fuel Quantity Transmitter , Inspection and Replacement. That earlier CASA AD was cancelled in 1980; the AD text states that “AD/CESSNA 210/35 was cancelled in 1980 with no justification available” (Background). The CASA AD/CESSNA 210/76 therefore reintroduces a documentary review and reference to the FAA AD as the mechanism of addressing the same underlying subject matter.
• The CASA AD references FAA AD 78-26-12 and states that it is to be followed “as in force from time to time” (Requirement 1; Note 2). That language means the CASA AD incorporates the FAA AD’s current form at any later point, rather than fixing the requirement to a single past version. The AD thus creates a continuing link to the FAA AD’s amendment history, making any future FAA amendments automatically relevant to CASA-regulated operators to the extent the FAA AD remains the imported instrument.
• The AD notes that Cessna Service Letter SE78-69 “relates to the subject of this AD” and that FAA AD 78-26-12 and Cessna Service Letter SE78-69 “remain current” (Background; Note 4). That statement locates the contemporary technical materials the AD relies upon.
• The AD cancels no other ADs itself within the provided text; instead it references the prior cancellation of CASA AD/CESSNA 210/35. The AD thus updates the regulatory posture by reasserting a compliance obligation via documentary review and cross-reference to a foreign AD, but it does not contain a record of earlier amendments to AD/CESSNA 210/76 (there are none as it is the issuing instrument).

Taken together, the supplied material sets out a narrow amendment narrative: a prior CASA AD existed and was cancelled decades earlier; FAA and manufacturer materials addressing the issue have persisted; CASA issues AD/CESSNA 210/76 to require operators to confirm compliance with those external instruments or to carry out the FAA AD actions. The AD’s “as in force from time to time” wording makes the FAA AD’s subsequent amendment history relevant to Australian operators without further amendment to the CASA AD text itself.

The AD text supplied does not record any litigation history. It contains no references to judicial challenges, tribunal decisions, or other litigation outcomes relating to AD/CESSNA 210/76, to FAA AD 78-26-12, to CASA AD/CESSNA 210/35, or to Cessna Service Letter SE78-69. The Background notes that AD/CESSNA 210/35 was cancelled in 1980 “with no justification available,” but does not refer to any court or administrative review (Background).

Because the provided material contains no litigation references, there are no source-grounded cases, appeals, judicial interpretations, or enforcement proceedings to summarise for this AD from the supplied text. Any statements about legal challenges or precedent would therefore be outside the scope of the source material and cannot be asserted here.

Users requiring litigation history should consult CASA’s records, court databases, or other authoritative sources external to the AD text provided, since that information is not included in the instrument reproduced.

The AD text contains several operational and interpretive traps for owners, operators and maintainers; each item below is grounded in the supplied AD wording.

1. Narrow serial-number applicability: The AD applies only to specified models and discrete serial number ranges (Applicability). Operators must check serial numbers carefully. Aircraft of the same model but with serial numbers outside the listed ranges are not subject to this AD as worded. Failure to confirm the precise serial number could lead to unnecessary work or, conversely, non-compliance if a covered aircraft is mistakenly treated as out of scope.

2. Records-based pass/fail: Compliance hinges initially on the content of maintenance records (Requirement 1). If historical maintenance logs do not explicitly show compliance with FAA AD 78-26-12 (as in force from time to time) or the historical CASA AD/CESSNA 210/35 as it stood before cancellation, the aircraft is not considered compliant and must undergo the FAA AD actions (Requirement 2). Operators should not assume that an absence of an explicit reference equals compliance; the AD places the burden on verifying whether records show the required compliance.

3. Self-certification requires a private pilot’s licence: Note 1 permits the registered operator to accomplish and certify the records determination only if they hold at least a private pilot’s licence. Owners or corporate representatives without that licence cannot self-certify the records check under the AD’s terms; they must arrange for an appropriately qualified person to make and sign the determination.

4. “As in force from time to time” imports future changes: Note 2 requires compliance with the most recent version of FAA AD 78-26-12. Operators must therefore monitor that FAA AD for amendments; a records-based determination that references an earlier FAA AD snapshot could be insufficient if the FAA AD is later amended. The AD does not freeze the technical standard to a particular edition.

5. Ferry flight constraints: The AD allows a ferry flight to a location where the inspection/actions may be accomplished only if the pilot visually verifies adequate fuel through the fuel filler neck (Note 5). This is a narrow operational permission and not a general relief allowing further flight pending repair. Pilots must ensure the flight is limited to relocation for compliance work and that fuel adequacy is visually confirmed; the AD does not permit routine flight operations prior to completing FAA AD-prescribed actions.

6. Reliance on external documents for technical work: The AD does not itself reproduce the technical steps required; instead it requires operators to “carry out the actions detailed in FAA AD 78-26-12” (Requirement 2) and notes that Cessna Service Letter SE78-69 relates to the subject (Note 4; Background). Operators must obtain and follow the referenced FAA AD and consult the Cessna service letter. Not having those documents on hand or misinterpreting them could lead to non-compliance.

7. Historical cancellation ambiguity: The Background notes that CASA’s earlier AD/CESSNA 210/35 was cancelled in 1980 “with no justification available.” That statement suggests a gap in the administrative record , operators relying on historical CASA action should be cautious and ensure records actually show compliance in the sense the current AD requires.

8. No penalties or enforcement detail in text: The AD sets out obligations and timing but does not, in the provided content, identify the detailed enforcement mechanism or penalties. That omission can be a practical gotcha for operators who expect to find administrative processes, forms or appeal pathways in the AD text; these are not included in the reproduced material.

9. Multiple overlapping serial ranges: Note the serial-number ranges are repeated for some model groups (for example, 21062274 through 21063025 appears both under 210N and T210N). Operators must parse the applicability table carefully to avoid misapplication.

10. Documentation standard not specified: The AD requires that records “show compliance” but does not define precisely what form that evidence must take (e.g. a signed logbook entry, specific form citation, or referenced FAA AD number). Operators should preserve or create clear, traceable records demonstrating the link to FAA AD 78-26-12 or CASA AD/CESSNA 210/35 to avoid ambiguity.

Each of these points derives directly from the AD text and its Notes. Addressing the gotchas requires careful administrative processes: checking serial numbers, locating historical maintenance records, obtaining the FAA AD and Cessna service letter, ensuring the person signing a records determination holds at least a private pilot’s licence, and safely conducting any permitted ferry movement.

The AD provides a concise compliance path. The steps below follow the AD’s Requirements and Notes verbatim where possible and translate them into an operational checklist that is grounded in the AD text.

Step 1 , Confirm applicability

• Verify the aircraft model and serial number against the AD’s Applicability list: 210G; 210H; 210J (SN 21058819-21059199); 210M; 210N (SN 21062274-21063025); T210G; T210H; T210J (SN T210-0198-T210-0454 and 21058140); T210M; T210N (SN 21062274-21063025); and P210N (SN P21000001-P21000141). The AD applies only to aeroplanes within those enumerated ranges.

Step 2 , Documentary review (Requirement 1)

• Within 28 days after the AD commencement date (the AD commences 3 September 2021), perform a maintenance-records review to determine whether the aircraft’s records show compliance with either: a) FAA AD 78-26-12, “as in force from time to time”; or b) CASA AD/CESSNA 210/35, “as in force on the day prior to its cancellation” (Requirement 1; Compliance timeframe).
• This review may be carried out and certified by the registered operator provided that person holds at least a private pilot’s licence (Note 1). Ensure the person signing the determination meets that requirement.

Step 3 , Determine the outcome of the records review

• If maintenance records show compliance with either the FAA AD (current as applicable) or the historical CASA AD/CESSNA 210/35 as it stood pre-cancellation, no further action is required for the purposes of this AD (Note 3). Record and retain documentary evidence of the records review and the basis for the pass determination.
• If maintenance records do not show compliance with either instrument, proceed to Step 4.

Step 4 , Carry out the FAA AD actions (Requirement 2)

• For aircraft without records showing compliance, carry out the actions detailed in FAA AD 78-26-12, “as in force from time to time” (Requirement 2). Obtain the current text of FAA AD 78-26-12 and follow its mandated inspections, replacements, or other technical steps. The CASA AD imports the FAA AD’s technical requirements; compliance must be with the FAA AD in its current form per Note 2.
• Complete the FAA AD actions before further flight of the aircraft (Requirement 2; Compliance: before further flight). Do not operate the aircraft except as permitted under Step 5.

Step 5 , Ferry flight provision (Note 5)

• If the aircraft must be flown to a location where inspections or FAA AD actions can be performed, a ferry flight is permitted only if the pilot visually verifies, through the fuel filler neck, that adequate fuel is available to complete the flight. The ferry flight permission is therefore constrained to the single-purpose relocation to a maintenance-capable location.

Step 6 , Reference materials and documentation

• Obtain and retain copies of: a) The current FAA AD 78-26-12 (the CASA AD requires compliance with the FAA AD “as in force from time to time” , Note 2). b) Cessna Service Letter SE78-69 (the AD notes that this Service Letter “relates to the subject of this AD” , Note 4; Background). c) Documentary evidence of the maintenance-records review and of any FAA AD actions performed (work orders, logbook entries, signed certifications).
• Where an operator’s records are found sufficient under Requirement 1, document exactly which entries demonstrate compliance (e.g. specific logbook entries referencing FAA AD 78-26-12 actions or the CASA AD/CESSNA 210/35 actions as of the day prior to cancellation).

Step 7 , Maintain auditable records

• The AD’s compliance gate is documentary. Keep auditable records that clearly show the operator’s determination, the name and licence of the person certifying the determination (if the registered operator performs the check under Note 1), and the details of any FAA AD actions performed (dates, maintenance organisation, signatures, parts replaced).

Step 8 , Monitor FAA AD changes

• Because the AD requires compliance with FAA AD 78-26-12 “as in force from time to time” (Note 2), operators should adopt a process to monitor the FAA AD for amendments. Changes to the FAA AD may alter the technical steps required for future checks or rectifications.

Step 9 , Consult Cessna Service Letter SE78-69

• The AD notes that SE78-69 relates to the subject. Obtain and review that Service Letter to inform technical work, even though the CASA AD does not itself mandate it.

Practical considerations grounded in the AD text:

• Ensure the person certifying the records review holds at least a private pilot’s licence if the registered operator chooses to self-certify (Note 1).
• Do not rely on a generic statement of prior inspection unless the maintenance records specifically show compliance with the required instrument(s) (Requirement 1; Note 3).
• If an operator lacks a qualified person to certify the records determination, arrange for a suitably licensed pilot or an authorised maintenance organisation to perform the review and sign the record.

Following these steps will align operations with the AD’s documentary and technical requirements as stated in the instrument.

David Punshon Delegate of the Civil Aviation Safety Authority 24 August 2021