AD/A330/55 - Pilot and Co-pilot Powered Seats

The central concept of this directive is the mandatory management of a continuing airworthiness deficiency arising from a manufacturing non‑compliance. The deficiency is not a failure in service but a latent defect: the rotor shaft hardness of certain actuators was below specification, leading to accelerated gear wear that could cause uncommanded powered seat movement. The concept of “actuator” is critical here. The directive does not require removal of entire seats but specifically targets the actuator component, which is the electromechanical device controlling horizontal seat movement. The part numbers for actuators are narrower than the seat part numbers listed in the applicability table; the actuators identified for mandatory removal are exactly two: P/N 4136290004 and P/N 4136290005, both with serial numbers below 5080. The directive also uses the concept of a “service bulletin” - Sogerma SB TAAI1‑25‑617 - as the approved corrective action for actuators not falling into the mandatory removal category. That service bulletin is likely an engineering instruction for inspection, repair or replacement of the actuator gear or rotor shaft. The directive imported the French DGAC AD F‑2005‑164 (EASA Approval 2005‑6252), making it an Australian requirement via CASA’s delegated authority. This reflects the international nature of airworthiness regulation and the reliance on the state of design for foreign‑manufactured aircraft. The concept of “return to Sogerma” for spare kits is unusual: it requires not merely disposal or quarantine but physical return of the kits to the original manufacturer. That imposes a logistics cost and potentially a loss of inventory value on the operator. The compliance deadline of 31 May 2010 - more than four years after the effective date - reflects that the wear is not immediate but progressive, and that the service bulletin and removal actions require planning and part availability. The directive also contains a “safe harbour” concept: seats on which SB TAAI1‑25‑617 has already been accomplished are exempt from further action, indicating that the directive’s purpose is to ensure that the corrective action has been done, not to require repetition. Finally, the carve‑out for seats with serial number 792 or higher (with no actuator replacement) suggests that later‑production seats incorporated the corrected rotor shaft and do not require action unless the actuator was swapped with an earlier unaffected unit.

The directive directly affects any person or entity that operates, owns, maintains or has continuing airworthiness responsibility for an Airbus A330 series aeroplane equipped with the specified powered cockpit seats. In Australia, that primarily includes commercial airlines (such as Qantas, Virgin Australia and other operators of A330 aircraft), charter operators, leasing companies that retain airworthiness control, and maintenance organisations holding a CASA‑approved Part 145 or equivalent maintenance certificate. The directive also affects Sogerma itself (now part of Safran) as the seat manufacturer, because the spare kits must be returned to it. The compliance obligation falls on the “operator” - the entity registered as the operator of the aircraft under Civil Aviation Regulations - but it may also be picked up by the airworthiness‑management contractor or the holder of the air operator’s certificate. The directive imposes no direct obligations on flight crew (pilots and co‑pilots) as individuals, but they are the end users of the seat system and may be affected by the directive’s outcome: seats with properly functioning actuators reduce the risk of uncommanded movement. The directive does not apply to aircraft that do not carry the listed seat part numbers, nor to aircraft whose seats are of the specified later production series with high serial numbers. It does not apply to spare seats or actuators that are not installed on an aircraft (except the spare kits that must be returned). The directive applies extraterritorially to the extent that the aircraft is registered in Australia or operated by an Australian operator, even if the aircraft is overseas at the time of compliance. Maintenance organisations are affected because they must source the service bulletin, obtain any necessary parts (if the actuator must be replaced), and ensure the identification task is performed correctly. The compliance dates give a long lead time, which reduces the immediate operational disruption but creates a risk that the directive may be overlooked or forgotten, especially as aircraft may be leased, sold or transferred before 2010. The directive also affects the secondary market for the affected seats and actuators: after 31 May 2010, it is prohibited to re‑install the identified actuators, which effectively writes off that inventory unless it can be overhauled or the rotor shaft replaced outside the scope of this directive (though the directive does not explicitly prohibit repair). The requirement to return spare kits to Sogerma forces operators to incur shipping costs and lose the value of those kits, which may be a non‑trivial expense for a fleet operator holding several of them.

The directive imposes four main duties, all mandatory under the Civil Aviation Act 1988 and the regulations that empower CASA to issue airworthiness directives. Duty one: the operator must identify the actuator part number on each affected cockpit seat and, where the actuator is not an already‑removed type or already corrected per the service bulletin, accomplish corrective action per Sogerma SB TAAI1‑25‑617. Duty two: actuators with P/N 4136290004 or 4136290005 and S/N below 5080 must be removed from service by 31 May 2010. Duty three: after 31 May 2010, those same actuators shall not be re‑installed on any aircraft; this is an ongoing prohibition that applies regardless of whether the actuator was removed earlier or still in inventory. Duty four: spare kits with P/N TAAI2‑426000‑03 and TAAI2‑426000‑04 must be returned to Sogerma by 31 May 2010. There is no explicit duty to report compliance to CASA, but standard practice under CASA’s Continuing Airworthiness Regulations requires the operator to maintain records of AD compliance, and CASA may audit or require evidence. The duty to return spare kits to Sogerma is unusual: it effectively disposes of the operator’s property ownership for those parts. The directive does not provide for compensation or reimbursement for the cost of removal, replacement, or shipping. The operator bears all compliance costs. The directive does not grant a right to request an alternative method of compliance (AMOC), but the source text does not preclude it; under general CASA practice, an operator may apply for an AMOC if the alternative achieves an equivalent level of safety. However, the directive does not mention any such process, so the operator must assume that only the literal instructions in the service bulletin or removal are acceptable. The directive also creates a kind of entitlement: if the service bulletin has already been accomplished on a seat, no further action is required. This rewards prior compliance. The directive does not create a right to continue using the affected actuators beyond the deadline; any continued operation beyond 31 May 2010 with the prohibited actuators would be a breach of the AD and potentially grounds for enforcement or grounding. The operator also has a duty to ensure that the maintenance organisation performing the work is appropriately authorised and understands the applicability of the directive to the specific aircraft.

The source text of this directive does not itself state penalties. However, under the Civil Aviation Act 1988 (Cth) and the Civil Aviation Safety Regulations 1998, failure to comply with an airworthiness directive is a serious breach. An airworthiness directive is a direction issued under regulation 39 (or equivalent provisions) and is legally enforceable. Non‑compliance can lead to CASA taking enforcement action including suspension or cancellation of the air operator’s certificate, the aircraft’s certificate of airworthiness, or the maintenance organisation’s approval. CASA may also issue a direction to ground the aircraft until the directive is complied with. Civil penalties can apply under the Act, such as fines for operating an aircraft that does not meet the conditions of its airworthiness certificate. Criminal penalties are possible if the breach is wilful or reckless, and could include imprisonment under s 20A of the Civil Aviation Act for reckless operation causing danger. The practical risk for an operator is that CASA inspectors audit AD compliance as part of routine surveillance; discrepancies may result in a non‑compliance report and a demand for immediate action. Because the compliance deadline was 31 May 2010, any current operator of an A330 that had not complied by that date would have been in breach. If the directive is still relevant for later‑manufactured seats (where the actuator was replaced with an earlier unit), the obligation continues indefinitely for specific actuator serial numbers. The requirement not to re‑install certain actuators (requirement 3) is ongoing and does not expire. Therefore, if an operator inadvertently installs a prohibited actuator today, they would be in breach. Enforcement could also extend to the person who performed the maintenance or the engineer who certified the aircraft. The directive does not impose a record‑keeping duty explicitly, but regulation 42 of CASR requires AD compliance to be recorded in the aircraft’s continuing airworthiness records. Failure to keep such records is an independent regulatory breach. There is no private right of action for passengers or third parties under this directive; enforcement is entirely public.

This directive sits within the hierarchy of Australian aviation safety regulation. It is issued under the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 (or earlier Civil Aviation Regulations 1988, depending on the transition). It supplements the type certificate data sheet and the approved maintenance program for the A330. The directive is additional to, not a replacement for, any other airworthiness limitations. The directive specifically references DGAC AD F‑2005‑164 (EASA Approval 2005‑6252), which is the foreign counterpart. For A330 aircraft registered in Australia, this CASA AD gives legal force to that foreign AD; for aircraft operated by an Australian operator but registered elsewhere, the foreign AD may be directly applicable, but the Australian AD may also apply if the operator’s certificate requires compliance with CASA directives. The directive interacts with the Civil Aviation Safety Regulations governing continuing airworthiness, particularly Part 42 (if the aircraft is operated under Part 121 or 135) or Part 91 for general aviation. Maintenance organisations must comply with Part 145 or equivalent; the service bulletin referred to may require component repair that must be performed by an appropriately rated organisation. The directive also interacts with the supplier’s liability and product quality: if the actuator was defective due to non‑conforming hardness, the operator may have a contractual or tort claim against Sogerma, but the directive does not address that. In Federal Court or state court, a failure to comply with this AD could be used as evidence of negligence if an accident occurs. The directive does not override any contractual provisions, but it imposes a statutory duty that cannot be contracted out of. The requirement to return spare kits to Sogerma may conflict with an operator’s property rights, but the directive authorises CASA to require such return as a condition of continuing airworthiness. The directive also has an international dimension: because it is based on a DGAC AD, it implies that the European Aviation Safety Agency (now EASA) has already considered the safety case. Australian operators must satisfy both national and international obligations. The directive does not mention other CASA directives (such as AD/A330/54 or 56), but those would be independent requirements; there is no consolidation. The interaction with crew licensing or training is indirect: if a seat moves uncommanded, crew procedures may address it, but the directive seeks to prevent the condition rather than train for it.

The source text of this directive provides no amendment history. The document is the original AD/A330/55, numbered 13/2005, effective 22 December 2005. There is no indication in the source that it has been superseded, amended, or withdrawn. In practice, CASA issues a Notice of Proposed Amendment or a variation if new information emerges. However, this directive does not contain any amendment log or reference to previous versions. It is possible that later directives superseded this one, but that is not present in the source and must not be assumed. The directive itself is a single page with a table, a signature block, and a background paragraph. It does not include any revision bars, effective dates for amendments, or a list of changeable parts. The absence of amendment history is notable: it means the directive is a one‑off instrument. The compliance date of 31 May 2010 suggests that the action was intended to be completed by that date, and after that, the directive remains in effect for the ongoing prohibition on re‑installation. However, it is common for CASA airworthiness directives to be superseded by a later directive that includes the same requirements or updates them based on new service bulletin revisions. Without source evidence, we cannot claim any such supersession. The directive also incorporates by reference a service bulletin (Sogerma SB TAAI1‑25‑617). If that service bulletin is later revised, the directive does not automatically update; a new directive or an alternative means of compliance would be needed to adopt the revised bulletin. The operator must ensure they use the exact revision referenced in the original directive unless CASA approves otherwise. This is a potential trap: an operator may mistakenly use a later revision of the service bulletin that differs in scope, and that may not satisfy the directive’s requirement. The directive’s amendment history therefore effectively consists of whatever changes occur to the incorporated service bulletin, but those changes are not part of the directive itself.

The source text contains no reference to any court or tribunal proceedings. Airworthiness directives are rarely the subject of litigation in Australia. The typical avenue for challenge would be an application for judicial review under the Administrative Decisions (Judicial Review) Act 1977 or under the ADJR Act, arguing that the directive was ultra vires, procedurally unfair, or based on irrelevant considerations. However, such challenges are uncommon because the safety case is usually well supported, and the economic cost of compliance is small relative to the cost of grounding or losing an aircraft. No reported Federal Court or Administrative Appeals Tribunal decisions specifically on AD/A330/55 have been identified (and the source does not name any). It is improbable that this directive provoked litigation: the defect was identified by the French authority, the directive gave a long compliance window, and the affected actuators are discrete components. The directive does not impose economically crippling costs. The only conceivable litigation might be between an operator and Sogerma over the cost of replacement or the return of spare kits. But that would be a private contractual dispute, not a challenge to the validity of the directive. The directive itself is a legislative instrument, and under s 9 of the ADJR Act, it may be reviewable if it is a decision of an administrative character. However, legislative instruments are generally not reviewable; the line between legislative and administrative may be argued. The lack of litigation history suggests that the directive was accepted as reasonable and necessary. It also reflects the general compliance culture in aviation: operators rarely risk enforcement action by failing to meet AD deadlines, and the only way to get a court ruling is to breach the AD and then defend enforcement proceedings, which is unattractive. For the purpose of this deep dive, the litigation history is zero.

Several features of this directive can catch out an unwary operator or maintenance engineer. First, the applicability is deceptively complex. The table lists numerous seat part numbers, but the directive does not apply to all seats with those numbers: it has a carve‑out for seats with P/N ending in TAAI3‑03PE00‑01, etc., provided the seat serial number is 792 or higher and the actuator has never been replaced. If the actuator has been replaced at any time since delivery, the exception is lost and the seat becomes subject to the directive. That means an operator must know the complete service history of the actuator, not just the seat serial number. If an actuator replacement occurred but was not properly documented, the operator may wrongly assume exemption. Second, the directive requires the operator to “identify the cockpit seats actuator P/N installed on the seats”. This is not the same as the seat part number. The actuator P/N is a separate component. Some maintenance manuals may not list the actuator P/N prominently. The operator must disassemble or access the actuator to read its tag. This is a physical labour cost that might be overlooked when budgeting. Third, the compliance date of 31 May 2010 is long past. For any operator acquiring a second‑hand A330 today, they must verify that the historical actions were taken. If the previous operator failed to comply, the new operator inherits the breach. There is no statute of limitations on AD non‑compliance; CASA could take enforcement action even years later. Fourth, the requirement to return spare kits to Sogerma is unusual and may be missed. An operator might simply discard or sell the spare kits, but the directive explicitly requires return to Sogerma. Failure to return is a breach. The directive does not specify who pays for shipping, so the operator bears that cost. Fifth, the prohibition on re‑installation after 31 May 2010 applies even if the actuator has since been overhauled and the gear wear corrected. The directive does not accept post‑removal repair; it permanently bans those specific serial numbers. If an engineer inadvertently re‑uses an actuator that was removed earlier, that is a breach even if the actuator now has a replacement shaft. Sixth, the directive does not mention any requirement to mark the removed actuators as destroyed or quarantined. If not clearly tagged, they could be left in inventory and mistakenly re‑installed. Seventh, the directive references Sogerma SB TAAI1‑25‑617. That service bulletin may have itself been revised or superseded by later bulletins. The operator must ensure they use exactly the revision that the directive mandates, and not a later revision unless CASA explicitly approves it. Using a later revision that changes the required actions may result in non‑compliance with the directive. Finally, the directive includes a note stating “DGAC AD F‑2005‑164 (EASA Approval 2005‑6252) refers.” That is a cross‑reference but not an incorporation. If an operator relies solely on the French AD without checking the CASA AD for any differences, they might miss the return‑of‑spare‑kits requirement, which is specific to the Australian version. The CASA AD also adds a signature and effective date; the operator must comply with the Australian version as published.

Compliance is a series of concrete actions, most of which should have been completed by 31 May 2010. For an operator still flying A330 aircraft equipped with the listed seats, the first step is to determine whether the aircraft is within the applicability. Check the aircraft’s configuration records for the cockpit seat part numbers. If the aircraft has seats bearing one of the listed P/Ns, and the seat is not of the exempted high‑serial‑number type with unreplaced actuator, then proceed. The best evidence of compliance is a documented record showing that Sogerma SB TAAI1‑25‑617 was accomplished on that seat before 31 May 2010. Look for an engineering log entry, a maintenance release, or a yellow tag from the seat. If that record exists, no further action is needed for that seat. If the SB accomplishment is not documented, the operator must then inspect the actuator to get its P/N and S/N. This will require physical access: either removal of the seat cushions or access panels. For actuators with P/N 4136290004 or 4136290005 and S/N below 5080, they must have been removed from service by 31 May 2010. Verify that the removal occurred and that the actuator was not later re‑installed. Re‑installation is prohibited, so any such actuator still on the aircraft today would be a breach. The current operator must remove it immediately if found. For other actuators, the corrective action per SB TAAI1‑25‑617 must have been done. If not done, the operator must accomplish it now (even though the deadline has passed) to come into compliance; that may require obtaining the service bulletin from Sogerma, procuring any necessary parts, and performing the work at an appropriately rated maintenance organisation. The operator must also locate any spare kits with P/N TAAI2‑426000‑03 or TAAI2‑426000‑04 that are in inventory. These must be returned to Sogerma. The operator should contact Sogerma (now Safran Seats) for the return logistics and shipping instructions. Retain proof of return (e.g., courier receipt, email confirmation) as part of the AD compliance record. Finally, ensure that the aircraft’s continuing airworthiness records clearly note the compliance with this directive, including identification of the actuator P/Ns and the actions taken. If the operator is a new owner of an A330, conduct a full audit of past compliance with all CASA airworthiness directives, including this one. If compliance cannot be verified, the operator should treat the aircraft as non‑compliant and carry out the required identification and corrective actions as soon as possible. Engage with CASA regional offices if any ambiguity exists; they may accept alternative means of compliance if the intent of the directive can be met by a different method (e.g., replacement of the entire seat). However, such alternative means are not mentioned in the source, so the safest course is to follow the directive literally.