{"id":"F2006B06099","name":"AD/PC-12/36 - Passenger Seat Identification and Pedestal Leg Installation","slug":"ad-pc-12-36-passenger-seat-identification-and-pedestal-leg-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46839,"registerId":"commonwealth-F2006B06099-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PC-12/36 - Passenger Seat Identification and Pedestal Leg Installation","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \n\nAIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nPilatus PC-12 Series Aeroplanes\n\nAD/PC-12/36 Passenger Seat Identification and Pedestal Leg\n\nInstallation\n\n  \n2/2003\n\nDM\n\nApplicability: All PC-12 and PC-12/45 aircraft, manufacturing serial numbers 101 through 436, with passenger seat vendor part numbers listed in Effectivity Part 1.A. of Pilatus Aircraft Service Bulletin 25-025, dated 27 September 2002.\n\nRequirement: Action in accordance with Pilatus Aircraft Mandatory Service Bulletin 25-025.\n\nNote: Switzerland FOCA AD HB 2002-658 refers.\n\nCompliance: Before 31 December 2002, unless already accomplished.\n\nThis Airworthiness Directive becomes effective on 11 December 2002.\n\nBackground: The forward and aft facing seats identification tags incorrectly identify the Pilatus part number although the ERDA Vendor Part Number is correct. Additionally, the forward pedestal legs have not been assembled correctly, and legs installed in reverse order do not meet conformity requirements and may not perform as intended under emergency landing conditions.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.jpeg)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 6 December 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 11 December 2002.\n\n  \nPage 1 of 1","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope. It addresses a specific safety defect in a limited production run of PC-12 aircraft (serial numbers 101-436) regarding seat identification and pedestal leg installation. There is no evidence of scope creep; the directive remains tightly focused on the original safety issue identified in the background section."},"complexity_factors":["Single, specific aircraft type and serial number range (101-436)","Only two technical issues addressed (mislabelled tags and reversed pedestal legs)","Single compliance action (follow manufacturer's Service Bulletin 25-025)","No nested exceptions or conditional logic","Clear, fixed compliance deadline (before 31 December 2002)","Minimal cross-referencing (only to Pilatus SB 25-025 and Swiss FOCA AD HB 2002-658 as a note)"],"plain_english_summary":"This safety order requires owners/operators of Pilatus PC-12 and PC-12/45 aircraft (serial numbers 101–436) to correct mislabeled seat identification tags and verify/repair potentially reversed pedestal legs on forward and aft-facing passenger seats. Compliance must follow Pilatus Mandatory Service Bulletin 25-025 by 31 December 2002 (unless already corrected). The fixes prevent seat failure in a hard landing or crash, protecting occupant safety."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD is narrowly targeted to correct two related defects (incorrect seat identification tags and incorrectly assembled forward pedestal legs) on a specific range of PC-12 serial numbers and only where specific vendor part numbers apply. It does not broaden the instrument beyond that technical safety purpose; it requires compliance with a manufacturer service bulletin and sets a short compliance deadline. There is no indication in the text that the instrument grew beyond that original corrective intent."},"complexity_factors":["Single-issue AD with short text (one page)","Applicability limited to specific serial numbers (101–436) with further narrowing by vendor part numbers referenced in the external service bulletin","Primary requirement is entirely by reference to an external document (Pilatus Mandatory Service Bulletin 25-025) which contains the technical detail","Fixed compliance deadline (before 31 December 2002) and an effective date (11 December 2002) — simple temporal requirement","Minor cross-reference to foreign authority (Switzerland FOCA AD HB 2002-658)"],"plain_english_summary":"**What this instrument does (mechanically)**\n\n- This is an Airworthiness Directive (AD) that orders specific corrective work on certain Pilatus PC-12 and PC-12/45 aeroplanes. (See “Applicability” and “Requirement”.)\n- It requires operators of the affected aeroplanes to carry out the actions described in Pilatus Aircraft Mandatory Service Bulletin 25-025 (dated 27 September 2002). (See “Requirement”.)\n- The deadline for completing the work was set as before 31 December 2002; the AD became effective on 11 December 2002. (See “Compliance” and front matter.)\n\n**Who this affects**\n\n- Owners and operators of Pilatus PC-12 and PC-12/45 aeroplanes with manufacturing serial numbers 101 through 436 and with passenger seat vendor part numbers listed in Part 1.A of the Pilatus service bulletin. (See “Applicability”.)\n- Maintenance organisations and technicians who perform the mandated work (they must follow the Pilatus Mandatory Service Bulletin).\n- The Civil Aviation Safety Authority (CASA) as the regulator enforcing the AD; the AD was issued by a CASA delegate under subregulation 39.1(1) of the Civil Aviation Regulations. (See front matter and signature.)\n\n**Exactly what must be done**\n\n- Inspect and correct passenger seat identification tags that incorrectly show the Pilatus part number (the ERDA vendor part number is correct). (Background + Requirement.)\n- Check the forward pedestal leg assemblies for correct installation and, where legs have been installed in the reverse order, rectify them so they conform to the required assembly and performance standards. (Background + Requirement.)\n- All corrective work must be done in accordance with the procedures and instructions given in Pilatus Mandatory Service Bulletin 25-025. (Requirement.)\n\n**Why the AD was issued (stated reason)**\n\n- The AD states the problem: some seat identification tags incorrectly show the Pilatus part number (risking misidentification) and some forward pedestal legs were assembled in reverse order and therefore may not meet conformity or perform as intended in an emergency landing. The AD references the Swiss FOCA AD HB 2002-658. (Background + Note.)\n\n**Who pays, who decides, and what behaviour changes**\n\n- Aircraft owners/operators pay the direct costs (inspection labour, corrective work, any replacement parts, and aircraft downtime). (Implicit in the requirement to carry out the work.)\n- CASA (through its delegate) decides the mandatory compliance and enforces the AD under CAR subregulation 39.1(1). (Front matter and signature.)\n- Behaviour change: operators must inspect affected seats and pedestal leg assemblies and perform corrective work according to the manufacturer’s mandatory service bulletin rather than relying on routine maintenance practice. Maintenance providers must follow the specified Pilatus procedures.\n\n**Costs, incentives and trade-offs (practical effects)**\n\n- Direct costs: time in the hangar, technician hours, and any parts needed. These are concentrated on owners/operators of affected serial-numbered aircraft. (See Applicability + Compliance.)\n- Safety benefit: the AD aims to reduce risk of incorrect parts identification and possible pedestal leg failure in hard/emergency landings by ensuring correct labelling and correct assembly — a benefit concentrated on occupants and operators of the affected aeroplanes. (Background.)\n- Implementation channels work through the manufacturer’s mandatory service bulletin. That concentrates the procedural specification on Pilatus’ instructions (Requirement); this makes compliance straightforward but also means the corrective method is the manufacturer’s chosen approach, which may affect who supplies parts or has the required procedures.\n- Operational impact: compliance can cause aircraft downtime and scheduling costs until the work is completed by the compliance date. The AD does not itself specify costs or who supplies parts; those are commercial matters for operators and maintenance providers.\n\n**Compliance and enforcement notes**\n\n- The AD points operators to a single external document (Pilatus Mandatory Service Bulletin 25-025) for all technical instructions; obtaining and following that document is mandatory under the AD. (Requirement.)\n- CASA enforces compliance with the AD; failure to comply would be a breach of airworthiness requirements. (Front matter: issued under CAR subregulation 39.1(1).)\n\n**Implementation risks and practical points**\n\n- Reliance on the service bulletin means clarity and completeness of technical instructions rest with the manufacturer’s document. If the bulletin is ambiguous, operators may need clarification from Pilatus or CASA.\n- Where parts must be replaced or re-ordered, logistics and supplier lead times can increase downtime.\n\n(References in AD: “Applicability”, “Requirement”, “Compliance”, “Background”, and signature block.)"},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-12-36-passenger-seat-identification-and-pedestal-leg-installation","history":"/api/acts/ad-pc-12-36-passenger-seat-identification-and-pedestal-leg-installation/history","analysis":"/api/acts/ad-pc-12-36-passenger-seat-identification-and-pedestal-leg-installation/analysis","conflicts":"/api/acts/ad-pc-12-36-passenger-seat-identification-and-pedestal-leg-installation/conflicts","importantCases":"/api/acts/ad-pc-12-36-passenger-seat-identification-and-pedestal-leg-installation/important-cases","documents":"/api/acts/ad-pc-12-36-passenger-seat-identification-and-pedestal-leg-installation/documents"}}