{"id":"F2006B02991","name":"AD/B737/90 Amdt 2 - Main Deck Cargo Door","slug":"ad-b737-90-amdt-2-main-deck-cargo-door","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42350,"registerId":"commonwealth-F2006B02991-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/90 Amdt 2 - Main Deck Cargo Door","content":"![](image.001.png)\n\nAIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B737/90 Amdt 1 and issues the following AD under subregulation 39.1 (1) of CASR 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\n![](image.001.png)  \n\nBoeing 737 Series Aeroplanes\n\nAD/B737/90\n\nAmdt 2\n\n  \nMain Deck Cargo Door 4/2004\n\nApplicability: Model 737-200 and \\-300 series aircraft, equipped with a main deck cargo door installed in accordance with Supplemental Type Certificate (STC) SA2969SO.\n\nRequirement: 1. Action in accordance with the technical requirements of FAA AD 2001-09-15 Amdt 39-12222.\n\n2. Inspect in accordance with the technical requirements of FAA AD 2004-03-23 Amdt 39-13467.\n\nNote: Pemco Service Bulletins 737-52-0037 Revision 2, and 737-53-0003 refer.\n\nCompliance: As specified in the Requirement document(s) with a revised effective date of 15 April 2004.\n\nThis Amendment becomes effective on 15 April 2004.\n\nBackground: Reports were received of cracks in thirteen of the sixteen support angles in the lower jamb of the main deck cargo door due to fatigue. Cracks were also found in the lower frames and reinforcing angles of the main deck cargo door. Continued operation with such cracking could result in loss or opening of the cargo door, and loss of control of the aircraft.\n\nAmendment 1 was issued in response to two new main deck cargo door FAA airworthiness directives; which were prompted by the development of a modification that will provide better protection against the effects of structural fatigue, and an inspection and replacement of any lower frame or reinforcing angle of the main deck cargo door when it has reached its maximum life limit.\n\nAmendment 2 is issued in response to a new FAA AD which supersedes AD 2001-8-\n\n07. The new AD continues to require the existing actions, but corrects reference to an incorrect fuselage station. The one-time modification requirement of AD 2001-09-15 remains unchanged.\n\nBoeing 737 Series Aeroplanes\n\nAD/B737/90 Amdt 2 (continued)\n\nThe original issue of this Airworthiness Directive became effective on 20 July 1995.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 4 March 2004\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 24 March 2004.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Amendment 2 does not broaden the set of aircraft or add new types of obligations. It continues the existing inspection and one-time modification requirements and corrects an incorrect fuselage station reference from the earlier FAA-related ADs. The directive maintains the original safety focus (fatigue cracking of door structure) and keeps compliance tied to the same FAA ADs and Pemco service bulletins."},"complexity_factors":["Cross-reference to multiple FAA ADs (FAA AD 2001-09-15 and FAA AD 2004-03-23) rather than full technical text increases reliance on external documents.","Applicability limited to aircraft with main deck cargo door installed under STC SA2969SO requires operators to check STC status.","Involves both recurring inspections and a one-time modification plus possible part replacements (support angles, frames, reinforcing angles).","References to Pemco Service Bulletins (737-52-0037 Rev 2 and 737-53-0003) add layered technical instructions for maintenance providers.","Compliance deadline and revised effective date (15 April 2004) create scheduling and operational planning requirements for operators.","Amendment history (original AD, Amendment 1, Amendment 2) requires tracking of superseded vs current obligations and corrected fuselage-station references."],"plain_english_summary":"*AD/B737/90 Amdt 2* requires operators of Boeing 737-200 and -300 aircraft fitted with a main-deck cargo door under STC SA2969SO to perform inspections, replace worn parts and complete a one‑time modification by following specified FAA airworthiness directives and Pemco service bulletins. It responds to fatigue cracks found in door support angles, frames and reinforcing angles that could allow a door opening in flight. The obligation falls on aircraft owners/operators and their maintenance organisations, with compliance required by 15 April 2004."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"The legislation maintains its original narrow scope — safety oversight of a specific cargo door modification on Boeing 737-200/300 aircraft. Amendment 2 does not expand applicability to new aircraft types or introduce new categories of requirements; it merely updates technical references and corrects a fuselage station error in response to revised FAA guidance."},"complexity_factors":["Short, single-purpose document (2 pages) focused on one specific aircraft modification","Minimal defined terms — only standard aviation acronyms (AD, STC, FAA, CASR)","Heavy reliance on external documents — compliance requires reference to two separate FAA Airworthiness Directives (2001-09-15 and 2004-03-23) and two Pemco Service Bulletins, which are not reproduced in the text","Simple conditional structure: applicability → requirement → compliance → background","No nested exceptions or complex logical operators — requirements are straightforward 'inspect and modify' instructions","Amendment history is explained narratively rather than through technical revision tracking"],"plain_english_summary":"This AD requires Australian operators of Boeing 737-200 and -300 aircraft fitted with the main deck cargo door modification (STC SA2969SO) to inspect the door structure for fatigue cracks, perform mandated modifications from prior FAA directives, and replace life-expired parts. Compliance is mandatory and time‑critical, due by 15 April 2004.\n\nIt matters because fatigue cracks found in door frames could cause in‑flight door failure, depressurisation and loss of control; this amendment updates inspection requirements and corrects a fuselage location reference."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-90-amdt-2-main-deck-cargo-door","history":"/api/acts/ad-b737-90-amdt-2-main-deck-cargo-door/history","analysis":"/api/acts/ad-b737-90-amdt-2-main-deck-cargo-door/analysis","conflicts":"/api/acts/ad-b737-90-amdt-2-main-deck-cargo-door/conflicts","importantCases":"/api/acts/ad-b737-90-amdt-2-main-deck-cargo-door/important-cases","documents":"/api/acts/ad-b737-90-amdt-2-main-deck-cargo-door/documents"}}