{"id":"F2006B02815","name":"AD/B737/111 Amdt 1 - Seat Track Alignment","slug":"ad-b737-111-amdt-1-seat-track-alignment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42157,"registerId":"commonwealth-F2006B02815-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/111 Amdt 1 - Seat Track Alignment","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)  \nBoeing 737 Series Aeroplanes\n\nAD/B737/111\n\nAmdt 1\n\n  \nSeat Track Alignment 6/98\n\nApplicability: Model 737 series aircraft equipped with non-powered IPECO pilot’s seats; and having line position numbers 1 through 2836.\n\nRequirement: Perform a one-time operational test of the pilot’s seats and the seat locks to determine that the lock pin of the seat track fully engages in all lock positions of the seat track, in accordance with Boeing Service Bulletin 737-25-1334, or Revision 1, dated\n\n15 January 1998.\n\n    If the seat lock pin fully engages in all lock positions of the seat track, no further action is required.\n\n    b. If the seat lock pin does not fully engage in all positions of the seat track, re-align the seat tracks in accordance with Boeing Service Bulletin 737-25-1334, or Revision 1, dated 15 January 1998.\n\nNote: FAA AD 98-03-10 Amdt 39-10302 refers.\n\nCompliance: Unless already accomplished, before 21 August 1998\\. This amendment becomes effective on 21 May 1998.\n\nBackground: The FAA received reports indicating that a pilot’s seat slid from the forward position to the aft-most position during acceleration and take-off of the aircraft due to misalignment of the seat tracks. Such misalignment of the seat tracks, if not corrected, could result in uncommanded movement of the pilots’ crew seats, and consequent reduced controllability of the aircraft.\n\nAmendment 1 is issued in response to a new FAA AD which revises the applicability of the existing FAA AD.\n\nThe original issue of this Airworthiness Directive became effective on 6 November 1997.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"This amendment expands the scope of the original directive. The original AD became effective on 6 November 1997, and this amendment was issued specifically to revise the applicability (which aircraft are covered) in response to a new FAA AD. The description states 'Amendment 1 is issued in response to a new FAA AD which revises the applicability of the existing FAA AD,' indicating the coverage was broadened from the original intent."},"complexity_factors":["Single, discrete safety requirement with binary outcome (pass/fail)","Only 2 defined applicability criteria (seat type and line position numbers)","Simple conditional structure: one test with two possible results","No cross-references to other legislation beyond a single note about the related FAA directive","Clear, specific compliance deadline","Short document (approximately 250 words) with straightforward technical language"],"plain_english_summary":"This safety order requires operators of certain Boeing 737s fitted with IPECO pilot seats (S/N 1–2836) to perform a one‑time check that seat lock pins engage in all positions and, if they don’t, re‑align the seat tracks per Boeing’s instructions. It addresses incidents of seats sliding rearward during take‑off that impair control. The check was required by 21 Aug 1998; this amendment (effective 21 May 1998) expands affected aircraft per FAA information."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 revises the applicability of the original AD to address a new FAA AD’s applicability. The core requirement (one-time operational test and re‑alignment if necessary per Boeing Service Bulletin 737-25-1334) remains, but the set of affected aircraft is clarified (Applicability). The AD retains the original safety action and adds the revised applicability and dates."},"complexity_factors":["Narrow technical applicability: specific to Boeing 737 series with non-powered IPECO pilot seats and defined line numbers (Applicability).","Dependence on external OEM document: mandates procedures in Boeing Service Bulletin 737-25-1334 or Revision 1.","Binary one-time action: operational test with conditional remedial work (test → possibly re-align), reducing procedural complexity but requiring skilled maintenance.","Regulatory timeline: fixed compliance date (before 21 August 1998) and effective date (21 May 1998) creating a short implementation window.","Safety-critical outcome: potential flight‑safety consequences mean work must be documented and performed to maintenance standards.","Amendment provenance: this is Amendment 1 responding to a revised FAA AD, requiring cross-reference and tracking of related ADs."],"plain_english_summary":"This Airworthiness Directive requires operators of Boeing 737 aircraft fitted with non-powered IPECO pilot seats (line numbers 1–2836) to carry out a one-time operational check of pilot seats and seat locks and, if a lock pin does not fully engage, to re-align the seat tracks using Boeing Service Bulletin 737-25-1334 (Requirement). The aircraft operator pays for inspection/repairs, CASA enforces the AD, and compliance must occur by 21 August 1998 to address reports of uncommanded seat movement that could reduce aircraft controllability."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-111-amdt-1-seat-track-alignment","history":"/api/acts/ad-b737-111-amdt-1-seat-track-alignment/history","analysis":"/api/acts/ad-b737-111-amdt-1-seat-track-alignment/analysis","conflicts":"/api/acts/ad-b737-111-amdt-1-seat-track-alignment/conflicts","importantCases":"/api/acts/ad-b737-111-amdt-1-seat-track-alignment/important-cases","documents":"/api/acts/ad-b737-111-amdt-1-seat-track-alignment/documents"}}