AD/GC-1/1 State of Design Airworthiness Directives

State of Design Airworthiness Directive: This AD is sub-titled “State of Design Airworthiness Directives”. The concept derives from Australia’s bilateral airworthiness arrangements with the United States. Because the GC-1A and GC-1B were designed and type-certificated in the US, the FAA is the state-of-design authority. CASA, as the state-of-registry authority, issues this AD to adopt the FAA’s mandatory continuing airworthiness requirements. The concept avoids duplication; CASA does not independently evaluate the engineering of each FAA AD but relies on the FAA’s original safety finding.

FAA AD: The instrument references fourteen specific FAA ADs by number and short title, listed in Table 1. These date from the 1940s (e.g. AD 46-33-02) through to the 1950s (AD 56-16-04). Each FAA AD addresses a discrete airframe or system item, such as landing gear torque knees, fuselage reinforcement rework, asbestos cloth removal, carburettor flexible air duct, landing gear washers and elevator cable collars. The AD does not reproduce the content; the user must fetch the text from the FAA’s Regulatory and Guidance Library at the URL provided.

As in force from time to time: Note 2 of the AD states that the words “as in force from time to time” require compliance with the most recent version of the referenced document. This is a dynamic incorporation mechanism. It means that if the FAA later amends, supersedes or rescinds any of the fourteen ADs, the Australian compliance obligation shifts accordingly without a new CASA instrument. This is efficient for the regulator but places a continuing monitoring burden on the aircraft owner or maintainer. There is no “grandfathering” clause; a change in the FAA AD automatically changes the Australian duty.

Once-only actions: The background paragraph explains that each FAA AD in Table 1 requires a one-time action (inspection, replacement, rework, modification, etc.) for which the original FAA compliance date has already passed. The AD does not create recurring inspection intervals. However, if an FAA AD required additional follow-up actions at intervals (which does not appear to be the case for these vintage ADs), those would also be captured by the dynamic reference. The concept is important because it tells the owner that the work is not ongoing , once accomplished and recorded, the AD is satisfied for the life of the aircraft, unless the FAA later amends it to add further steps.

Determination of applicability: The AD places the onus on the person involved , typically the aircraft owner, operator or LAME , to determine whether each FAA AD applies to their specific aircraft. CASA provides a caveat that due to date of manufacture, configuration and modification status, some ADs will not be applicable. This puts a significant research burden on the private party. There is no centralised applicability register or CASA approval required for the determination; the person must consult the aircraft’s records, the manufacturer’s data and the FAA AD text to decide.

The AD applies primarily to the owners and operators of Australian-registered Swift Museum Foundation GC-1A and GC-1B aeroplanes. These are vintage, single-engined, two-seat monoplanes originally designed in the 1940s, mostly used by private owners, historical aircraft operators and some flying schools. The population in Australia is likely very small , perhaps a few dozen airframes at most. The AD also affects licensed aircraft maintenance engineers (LAMEs) and approved maintenance organisations (AMOs) who perform the required work. CASA itself is affected as the issuing authority, though its role is minimal after publication; it must monitor any FAA amendments to the listed ADs, though the dynamic incorporation shifts that monitoring cost to the regulated party.

The AD does not mention any exemptions for owners based on usage, such as private recreational versus commercial operations. It applies universally to all aircraft of the designated types holding an Australian certificate of airworthiness. An owner who has already performed the required actions in the past (for example, when the aircraft was previously US-registered) may need to verify that the work meets the current version of the FAA AD and that records are available. The AD does not contain a “previously accomplished” grace period; it says “has not been previously accomplished” but leaves verification of adequacy to the person.

The AD indirectly affects spare parts suppliers and specialist repair facilities, because some of the required actions may involve hard-to-find components for these old aircraft (asbestos cloth was mandated for removal by FAA AD 51-02-02, requiring a replacement material). The cost of sourcing parts for a 1940s aircraft may be substantial relative to its market value. There is no provision for cost-sharing or financial assistance from CASA.

Duty to determine applicability: The first requirement is that the responsible person determine whether each FAA AD in Table 1 is applicable to the aircraft. The AD does not say who that person is. By implication, it is the registered operator or owner, who often delegates to a LAME. The determination involves reviewing the aircraft’s serial number, modification status, and the applicability paragraphs of each FAA AD (which are not reproduced in the AD). The duty is not a one-off event; because the incorporation is dynamic, if an FAA AD is later amended to cover additional serial numbers or configurations, the determination must be revisited.

Duty to perform actions: If an FAA AD is found applicable and has not been previously accomplished (with appropriate records), the person must perform all actions required by that FAA AD. The actions may include inspections (with conditional follow-up), parts replacements, rework, or design changes. The AD does not prescribe a method of compliance beyond what the FAA AD requires. The person must follow the FAA AD to the letter, including any parts specifications, torque values, test procedures and required hardware.

Right to rely on prior accomplishment: The AD only requires action if the FAA AD “has not been previously accomplished”. There is no definition of what constitutes prior accomplishment, but the standard aviation practice is a logbook entry or approved data showing the work was done in compliance with the relevant AD at the time. Because the FAA ADs have existed for decades, many aircraft may already have compliance records. The risk arises if the records are incomplete or if the FAA AD was later amended to require additional steps; the dynamic reference means that a previous accomplishment may not satisfy the current version.

Compliance timeframes: For uncertified aircraft, the duty is triggered before issue of the certificate of airworthiness. For certified aircraft, compliance must be achieved within six months after 17 September 2020 , meaning by 17 March 2021. Note that this AD was published in 2020; the compliance date has now passed. For an aircraft that was already certified at that date, any overdue compliance means the aircraft is likely unairworthy. For an aircraft that acquires a certificate of airworthiness after the AD’s commencement, the duty applies before issue regardless of when that occurs.

Right to seek alternative means of compliance: The AD itself does not mention alternative means of compliance or CASA approvals for deviations. However, the parent regulatory framework (Civil Aviation Act 1988 and Civil Aviation Regulations 1988) typically permits an operator to apply to CASA for an alternative means of compliance to an AD, if it provides an equivalent level of safety. Nothing in this AD precludes that, but the operator should expect a higher burden of proof given the FAA’s original safety determination.

The AD does not specify penalty amounts, but failure to comply with an Airworthiness Directive is an offence under the Civil Aviation Act 1988 and associated regulations. Under regulation 42ZC of the Civil Aviation Regulations 1988, a person must not operate an aircraft if an applicable AD has not been complied with. The maximum penalty for a breach can include fines (currently up to 50 penalty units for an individual, or 250 for a body corporate, per offence, with each day a continuing offence). In practice, CASA enforcement may range from a warning letter, a direction to ground the aircraft, through to suspension or cancellation of the certificate of airworthiness. Repeated or deliberate non-compliance could result in prosecution.

Because this AD adopts FAA ADs by reference, an operator might incorrectly conclude that the FAA AD is merely advisory or relates only to United States-registered aircraft. That is incorrect; the AD makes the FAA ADs mandatory for Australian-registered aircraft. An enforcement case could arise if an operator fails to determine applicability and an FAA AD turns out to be relevant. The AD’s dynamic “as in force from time to time” clause also means that if the FAA revises an AD mid-cycle, an operator who complied with the old version but not the new one could be in breach.

The AD also has implications for the issue of certificates of airworthiness. Before issuing a CofA, CASA or an authorised person must be satisfied that all applicable ADs have been complied with. If an FAA AD in Table 1 is applicable and not accomplished, the CofA cannot be issued. For existing CofAs, an inspector could issue a direction to ground the aircraft until compliance is shown, or revoke the CofA under regulation 47 of the Civil Aviation Regulations if the aircraft is no longer airworthy.

AD/GC-1/1 is one of many airworthiness directives issued under the Civil Aviation Act 1988 (Cth), section 98 (power to issue directions). It sits within a hierarchy: the Act and regulations establish the general duty to maintain aircraft in an airworthy condition; ADs are specific mandatory instructions. Compliance with this AD is also likely relevant to the Airworthiness Management Framework under CASR Part 42 and Part 43 (though those regulations may not have applied at the time of issue for these vintage aircraft operating under CAR 1988). The AD does not explicitly reference other CASA instruments.

The AD interacts with the bilateral airworthiness agreement between Australia and the United States. By adopting state-of-design ADs, CASA avoids duplicative rulemaking. However, this also means that Australian requirements are determined by a foreign regulator without Australian parliamentary or ministerial oversight. The AD’s dynamic reference means that changes to FAA ADs take effect domestically without a new Australian instrument, which may raise administrative law considerations about delegation of legislative power. The AD itself contains no statement on this.

There is no interaction with state or territory work health and safety laws directly, though the performance of the AD actions (e.g. removal of asbestos cloth in AD 51-02-02) must comply with state asbestos removal regulations. A maintenance engineer must coordinate both the FAA AD requirement and local hazardous materials handling laws.

For imported aircraft previously on the US register, compliance with the FAA ADs may already be recorded. The AD does not automatically accept FAA compliance; the person must satisfy themselves that the work was done. If the US-registered aircraft had an FAA Form 337 or logbook entry for the AD, that should suffice, but only if the records match the current AD version. Because the AD uses dynamic incorporation, a US compliance record for a 1953 version of AD 51-02-02 might not cover a 1964 amendment.

The source instrument is AD/GC-1/1, issued on 25 August 2020 and commencing 17 September 2020. There is no indication in the source text that it has ever been amended. The numbering suggests it is the first AD for the GC-1 type (GC-1/1). The AD does not contain a history table or reference to previous versions. Because this is a single-issue instrument, the amendment history is effectively nil at the date of the source.

However, the dynamic incorporation of the FAA ADs “as in force from time to time” means that the content of the Australian obligation can change without amendment to the AD itself. For example, if the FAA issues a new airworthiness directive number that supersedes one of the listed ADs, the Australian requirement automatically refers to the superseding AD. Or if the FAA rescinds a listed AD (e.g. because the modification is no longer needed due to fleet attrition), the Australian requirement also disappears. This is a form of automatic amendment by external instrument. The AD does not require CASA to publish a notice when such changes occur, so the regulated community must monitor the FAA website. The practical risk is that an owner relying on an old printout of the FAA AD may miss a later amendment that adds a new inspection step.

The source text does not mention any litigation related to AD/GC-1/1, and given the very small fleet size of GC-1A and GC-1B aircraft in Australia, it is unlikely that any court proceeding has involved this specific AD. No Australian administrative appeals or judicial review on this AD are known. More generally, airworthiness directives have been challenged in the Administrative Appeals Tribunal or the Federal Court on grounds such as unreasonableness or procedural error, but the vintage nature of this AD and its limited impact make a challenge improbable. Any legal dispute would more likely concern an enforcement action for non-compliance, where the operator argues that an FAA AD was inapplicable or that compliance was impossible due to unavailability of parts. No such case is recorded in the instrument.

The most common trap is the dynamic “as in force from time to time” clause. An owner who complies with an FAA AD that was current on 17 September 2020 may believe the obligation fulfilled, only to discover later that the FAA subsequently amended the AD to require additional work. Because the AD does not restate the FAA AD text, the owner cannot simply file the CASA AD and forget it; they must periodically check the FAA website for changes. The URL provided in the AD goes to the FAA’s Regulatory and Guidance Library AD search page, which can be updated. There is no automatic notification system.

Another trap is the requirement to “determine applicability” of each of the fourteen FAA ADs. An owner might assume that because the aircraft has a valid certificate of airworthiness at commencement, all ADs must have been done already. That is not necessarily true. The original issue of a CofA might have predated the inclusion of some of these FAA ADs in Australian requirements. Or the aircraft may have undergone modifications that negate the applicability of certain ADs. The AD places the burden on the person to make that determination; a failure to do so is a breach even if the actual risk is negligible.

The six-month compliance period from commencement has now lapsed. For an aircraft that was registered in Australia after 17 September 2020 and already held a CofA from overseas, the six-month rule applies from its first Australian CofA? The AD says “if a certificate of airworthiness has been issued for the aircraft , within 6 months after the commencement date of this Directive”. That is a one-time deadline; any aircraft with a CofA at commencement should have complied by 17 March 2021. If an aircraft had no CofA at commencement, the obligation is “before issue of the certificate of airworthiness”. So an aircraft imported and first certificated in Australia in 2023 must comply before that CofA is issued. Owners who purchased an already-certified aircraft after 2020 inherit the compliance obligation; it does not reset with change of ownership.

The AD does not state that compliance with an FAA AD can be delegated to a person without a CASA licence. Some of the required actions may involve aircraft maintenance that must be performed or supervised by an appropriately rated LAME under CAR 42 or CASR Part 66. The FAA AD may require engineering data or parts approval that is not recognised in Australia. The owner must ensure that the maintenance organisation holds the necessary approvals and that the method of compliance is acceptable under Australian regulations.

The asbestos cloth removal AD (51-02-02) presents a special compliance hazard: the presence of asbestos in old aircraft components requires specialised handling, disposal, and personal protective equipment under state and Commonwealth health and safety laws. Simply following the FAA AD’s removal instructions may not satisfy Australian asbestos regulations. The owner must coordinate two separate legal regimes.

Compliance requires a systematic approach. Step one: locate the aircraft’s complete maintenance history, including any previous compliance records for FAA ADs. If the aircraft was previously on the US register, request copies of FAA Form 337 entries for each AD. If it has always been Australian-registered, check logbooks for “AD Fulfilled” stamps or CASA correspondence.

Step two: obtain the current text of each of the fourteen FAA ADs listed in Table 1. Use the URL provided in the AD (the FAA Regulatory and Guidance Library) or the FAA’s current AD search tool. Check the issue dates: although the table shows no issue dates (blank cells), the AD numbers are historic. It is essential to get the current version because the AD requires compliance “as in force from time to time”.

Step three: for each FAA AD, read its applicability paragraph carefully. The applicability may refer to serial number ranges, modifications, or equipment fit. Some ADs may be superseded by later ADs that still show under the same number; if the FAA shows a later AD as “supersedes”, the superseding AD becomes the requirement. If an FAA AD has been rescinded, the Australian obligation ceases.

Step four: for each FAA AD that applies, verify if it has been previously accomplished. The evidence must be clear: a logbook entry stating the AD number, the serial number of the part or aircraft, the date, and the person who performed the work. If the entry is vague (e.g. “AD complied with” without specifying which version), obtain further records. If the prior accomplishment was under an older version of the FAA AD and the AD has since been amended, the newer version’s requirements must be met.

Step five: for any applicable and unaccomplished FAA AD, arrange for the required action. This will involve sourcing parts, gaining access to the relevant airframe areas, and performing the work in accordance with the FAA AD’s instructions. Depending on the AD, it may require a design change (e.g. fuselage bulkhead rework) that may need engineering approval if it deviates from the type design data. The FAA AD itself is considered approved data for the purpose of Australian maintenance regulations, but any deviation (e.g. using an alternative material) requires separate approval.

Step six: after completion, make a detailed logbook entry recording the FAA AD number, a summary of the action, the date, the person and their authorisation, and a reference to the applicable version of the FAA AD. Retain copies of the FAA AD text used, and any shipping receipts, parts certificates, or test results. This record is essential for future sales, insurance claims, and CASA inspections.

Step seven: because the AD incorporates future amendments, set up a periodic check (e.g. annually) to verify that no changes have been made to any of the fourteen FAA ADs. The FAA’s website allows you to bookmark each AD’s page. If a revision is issued, re-evaluate applicability and redo the accomplishment if necessary.

Step eight: if any part of compliance becomes impossible , for example, a required part is no longer manufactured , consider applying to CASA for an alternative means of compliance or an exemption under regulation 132 of the Civil Aviation Regulations. The AD does not provide an automatic dispensation; proactive engagement with CASA is essential to avoid operating an aircraft in a state of non-compliance.