{"id":"F2006L02841","name":"AD/B737/33 Amdt 1 - Forward and Aft Cargo Compartments","slug":"ad-b737-33-amdt-1-forward-and-aft-cargo-compartments","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":60074,"registerId":"commonwealth-F2006L02841-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 737 Series Aeroplanes","sectionType":"division","heading":"Boeing 737 Series Aeroplanes","content":"### Boeing 737 Series Aeroplanes\n\n| AD/B737/33 Amdt 1 | Forward and Aft Cargo Compartments | 10/2006 |\n| ----------------- | ---------------------------------- | ------- |\n\n| Applicability: | Model 737 series aircraft, line numbers 1 through to 967, excluding cargo aircraft.                                                                                                                                                                                                                                                                                                                      |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with Boeing Service Bulletin 737-53A1027 Revision 7, dated 14 December 1989.Note 1: The FAA has approved the inspection, modification, and repair procedures contained in the Requirement document as an alternative to the earlier service bulletin issue specified in this Directive.Note 2: FAA AD 89-11-06 R1 Amdt 39-6515 refers.                                              |\n| Compliance:    | As specified in the Requirement document.                                                                                                                                                                                                                                                                                                                                                                |\n|                | This Amendment becomes effective on 28 September 2006.                                                                                                                                                                                                                                                                                                                                                   |\n| Background:    | Reports were received of extensive cracking of cargo compartment frames, including one aircraft with three adjacent frames completely severed, on aircraft with between 29,300 and 50,300 flight cycles and 21,600 to 32,600 flight hours.Amendment 1 is issued to introduce a Requirement note that specifies FAA approval of work accomplishment in accordance with the latest service bulletin issue. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n28 July 2006","sortOrder":0},{"sectionNumber":"AD/B737/33 Amdt 1","sectionType":"part","heading":"AD/B737/33 Amdt 1","content":"## AD/B737/33 Amdt 1","sortOrder":1},{"sectionNumber":"Forward and Aft Cargo Compartments","sectionType":"part","heading":"Forward and Aft Cargo Compartments","content":"## Forward and Aft Cargo Compartments","sortOrder":2},{"sectionNumber":"10/2006","sectionType":"part","heading":"10/2006","content":"## 10/2006","sortOrder":3}],"analysis":{"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"},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"Amendment 1 adds a Requirement note accepting FAA approval of work accomplished in accordance with the latest service bulletin issue. The set of affected aircraft and the core requirement to act per the Boeing service bulletin remain the same, but the amendment changes acceptable compliance pathways by explicitly permitting FAA‑approved procedures (see Requirement and Background)."},"complexity_factors":["Technical nature: structural inspections, modifications and repairs to cargo compartment frames require specialist engineering and maintenance (high technical competence).","External references: compliance depends on Boeing Service Bulletin 737‑53A1027 Rev 7 and an FAA Airworthiness Directive (cross‑jurisdictional documents).","Document coupling: 'Requirement' document sets the compliance schedule and methods rather than the AD itself, increasing dependency on another instrument.","Applicability constraints: precise applicability limited to line numbers 1–967 and excludes cargo aircraft, requiring accurate fleet identification.","Operational impacts: inspections/repairs imply aircraft downtime and direct operator cost (parts, labour, ferry flights).","Regulatory acceptance: amendment allows FAA‑approved procedures as alternatives, introducing regulatory discretion and potential variation in accepted work scope."],"plain_english_summary":"AD/B737/33 Amdt 1 requires operators of Boeing 737 series aeroplanes (line numbers 1–967, excluding freighters) to inspect, modify and repair forward and aft cargo compartment frames in accordance with Boeing Service Bulletin 737‑53A1027 Revision 7 (14 Dec 1989). The action responds to reports of extensive frame cracking. Operators pay for inspections and repairs, must follow the Requirement document for timing and methods, and may use FAA‑approved procedures in the latest service bulletin issue as an alternative."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of the Airworthiness Directive. It is a minor administrative update that allows use of a later revision of the referenced Boeing Service Bulletin (Revision 7 dated 1989) rather than restricting compliance to an earlier issue. The safety issue (cargo compartment frame cracking) and affected aircraft population remain unchanged."},"complexity_factors":["Very short document (approximately 250 words)","Only 1 defined term implicitly used ('line numbers' — aircraft manufacturing sequence numbers)","No cross-referencing to other legislation or complex conditional logic","Single straightforward requirement: comply with specified Boeing Service Bulletin","Simple applicability test based on model number and line number range","No nested exceptions or complex compliance calculations"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspections and repairs for cracking in the forward and aft cargo-compartment frames of passenger Boeing 737s (line numbers 1–967) to prevent structural failure. It affects airlines, owners and maintenance crews and adopts Boeing’s service bulletin (now permitting Revision 7 per FAA approval) as the approved repair method."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-33-amdt-1-forward-and-aft-cargo-compartments","history":"/api/acts/ad-b737-33-amdt-1-forward-and-aft-cargo-compartments/history","analysis":"/api/acts/ad-b737-33-amdt-1-forward-and-aft-cargo-compartments/analysis","conflicts":"/api/acts/ad-b737-33-amdt-1-forward-and-aft-cargo-compartments/conflicts","importantCases":"/api/acts/ad-b737-33-amdt-1-forward-and-aft-cargo-compartments/important-cases","documents":"/api/acts/ad-b737-33-amdt-1-forward-and-aft-cargo-compartments/documents"}}