{"id":"F2006B02702","name":"AD/B727/178 - Main Deck Cargo Door Hinge, Cargo Door System and Cargo Barrier - 2","slug":"ad-b727-178-main-deck-cargo-door-hinge-cargo-door-system-and-cargo-barrier-2","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42018,"registerId":"commonwealth-F2006B02702-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/178 - Main Deck Cargo Door Hinge, Cargo Door System and Cargo Barrier - 2","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\nBoeing 727 Series Aeroplanes\n\nAD/B727/178 Main Deck Cargo Door Hinge, Cargo Door System\n\nand Cargo Barrier - 2\n\n  \n11/2002\n\nApplicability: Model 727 series aircraft that have been converted from a passenger to a cargo- carrying (“freighter”) configuration in accordance with Supplemental Type Certificate (STC) SA1368SO, SA1797SO, or SA1798SO.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 2002-16-20 Amdt 39-12859.\n\nNote: Accomplishment of the actions in accordance with Aeronautical Engineers Incorporated (AEI) Service Bulletin AEI01-01, Revision B, dated 26 October 2001, constitutes compliance with the requirements of paragraphs (b) and (c) of the Requirement document.\n\nCompliance: As specified in the Requirement document with a revised effective date of 31 October 2002.\n\nThis Airworthiness Directive becomes effective on 31 October 2002.\n\nBackground: The FAA has determined that the main deck cargo door hinge installed on conversion from a passenger carrying to a cargo carrying aircraft configuration, is not fail- safe; that certain main deck cargo door control systems do not provide an adequate level of safety; and that the main deck cargo barrier is not structurally adequate during an emergency landing.\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 11 September 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 9 October 2002.\n\n  \nPage 1 of 1","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope: addressing specific airworthiness defects in Boeing 727 freighter conversions. It has not expanded beyond its original safety purpose."},"complexity_factors":["Short, single-page document with clear structure","Only 3 defined technical references (the STC numbers and FAA AD reference)","Single compliance pathway with one alternative method (AEI Service Bulletin)","No nested exceptions or conditional logic — straightforward applicability test (specific aircraft models + specific conversion certificates)","Cross-references only to external technical documents (FAA AD and AEI Service Bulletin), not to other legislative provisions","Plain language background section explaining the safety rationale"],"plain_english_summary":"CASA requires owners/operators of Boeing 727 freighters converted under STCs SA1368SO, SA1797SO, or SA1798SO to correct three dangerous defects: a non‑fail‑safe main deck cargo door hinge, insufficient cargo door control protections, and an inadequate cargo barrier. Compliance with FAA AD 2002‑16‑20 or AEI Service Bulletin AEI01‑01 Rev B is mandated by 31 October 2002. The fixes prevent explosive decompression and protect crew survivability."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD remains focused on correcting three specific unsafe conditions identified for Boeing 727 aircraft converted to freighters under the listed STCs (hinge, cargo door system, cargo barrier). It does not materially broaden the group of affected aircraft or add unrelated requirements; it instead adopts FAA AD 2002-16-20 as the technical remedy and specifies an effective date. Therefore the scope has not grown beyond the instrument’s original safety‑remediation purpose."},"complexity_factors":["Short, single‑subject AD (one page)","Narrow applicability (3 specific STCs)","Primary reliance on an external technical document: FAA AD 2002-16-20","Secondary reliance on AEI Service Bulletin AEI01-01 Revision B as an alternative means of compliance","Legal formality: compliance date revision and statutory issuance under CAR 1998 subregulation 39.1(1)","No extensive definitions or nested exceptions within the AD itself"],"plain_english_summary":"**What this instrument does (mechanically)**\n\n- This Airworthiness Directive (AD) orders operators to carry out the inspections, modifications or repairs specified in FAA AD 2002-16-20 for Boeing 727 aeroplanes that have been converted from passenger to cargo configuration using one of three specified Supplemental Type Certificates (STCs).  The AD makes compliance with those FAA-mandated actions mandatory in Australia.  It also states that carrying out the work described in Aeronautical Engineers Incorporated (AEI) Service Bulletin AEI01-01, Revision B (26 Oct 2001) satisfies particular paragraphs of the FAA AD.\n- The AD sets the legal compliance date (revised effective date) as 31 October 2002.\n\n**Who is affected**\n\n- Owners/operators of Boeing 727 series aeroplanes that were converted from passenger to freighter using STC SA1368SO, SA1797SO, or SA1798SO (see “Applicability” section).  Maintenance organisations and engineers who perform the work are also affected because they must follow the referenced FAA AD or the AEI service bulletin.\n\n**Why the AD matters (safety problem being addressed)**\n\n- The AD responds to identified safety deficiencies: the main deck cargo door hinge fitted during those conversions may not be fail‑safe; some cargo door control systems may not provide adequate safety; and the main deck cargo barrier may not meet structural requirements during an emergency landing (see “Background” section).  The AD requires corrective technical action to address those specific risks.\n\n**How it works in practice**\n\n- The Civil Aviation Safety Authority (CASA) delegate has issued the AD under the aviation safety regulation authority.  The AD does not itself set out detailed technical steps — instead it requires compliance with the FAA AD 2002-16-20 (the FAA document contains the technical requirements).  The AEI service bulletin is cited as an alternative means of compliance for particular paragraphs of the FAA AD.\n- Compliance means operators must schedule and complete the mandated inspections/modifications/repairs within the timeframes specified in the FAA AD, and retain evidence of compliance as required by civil aviation regulations.\n\n**Who pays and what changes for operators**\n\n- Aircraft owners/operators bear the direct costs: engineering time, parts, shop labour, and aircraft downtime while work is done.  Maintenance organisations will perform the work and bill operators under normal contracting arrangements.\n\n**Costs, incentives and trade‑offs**\n\n- Immediate costs are concentrated on the small group of operators who have 727s converted under the listed STCs.  Benefits (reduced risk of door or barrier failure) are diffuse — they accrue to the flying public and the operator in the form of improved safety and continued legal ability to operate the aircraft.\n- The AD removes the option for operators to defer or ignore the FAA-referenced fixes: compliance is mandatory to keep the aircraft airworthy.  That creates a clear safety incentive, but also an opportunity cost in maintenance resources and aircraft availability.\n\n**Implementation and compliance risks**\n\n- The AD depends on external technical documents (FAA AD and an AEI service bulletin).  Operators must obtain those documents and ensure their maintenance providers follow them correctly.  Potential implementation frictions include availability of approved parts, access to skilled maintenance personnel, and scheduling downtime.\n\n**Bureaucratic discretion and legal mechanism**\n\n- The AD is issued under CASA’s delegated power (subregulation 39.1(1) of CAR 1998).  The AD delegates the technical detail to the FAA AD and the AEI service bulletin; CASA enforces compliance by making those external documents mandatory for Australian-registered aircraft within the listed applicability.\n\n**Concrete references in the text**\n\n- “Applicability”: restricts the AD to B727s converted under STC SA1368SO, SA1797SO or SA1798SO.\n- “Requirement”: mandates action in accordance with FAA AD 2002-16-20.\n- “Note”: AEI Service Bulletin AEI01-01 Revision B constitutes compliance with specific paragraphs of the FAA AD.\n- “Compliance”: sets the effective date as 31 October 2002.\n- “Background”: lists the unsafe conditions that prompted the AD (hinge not fail-safe, inadequate control system safety margin, and inadequate cargo barrier strength).\n\n**Bottom line**\n\n- If you operate a Boeing 727 converted to a freighter under one of the three STCs listed, you must carry out the FAA AD’s required inspections/repairs (or the AEI service bulletin steps where noted) by the times specified, or your aircraft will not meet Australian airworthiness requirements. The AD enforces a narrowly targeted safety fix; it shifts the direct costs to the operators while aiming to reduce the specific failure risks described in the Background section."},"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-b727-178-main-deck-cargo-door-hinge-cargo-door-system-and-cargo-barrier-2","history":"/api/acts/ad-b727-178-main-deck-cargo-door-hinge-cargo-door-system-and-cargo-barrier-2/history","analysis":"/api/acts/ad-b727-178-main-deck-cargo-door-hinge-cargo-door-system-and-cargo-barrier-2/analysis","conflicts":"/api/acts/ad-b727-178-main-deck-cargo-door-hinge-cargo-door-system-and-cargo-barrier-2/conflicts","importantCases":"/api/acts/ad-b727-178-main-deck-cargo-door-hinge-cargo-door-system-and-cargo-barrier-2/important-cases","documents":"/api/acts/ad-b727-178-main-deck-cargo-door-hinge-cargo-door-system-and-cargo-barrier-2/documents"}}