{"id":"F2006B02908","name":"AD/B737/211 - Forward Pressure Bulkhead - 2","slug":"ad-b737-211-forward-pressure-bulkhead-2","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42250,"registerId":"commonwealth-F2006B02908-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\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 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","sortOrder":0},{"sectionNumber":"AD/B737/211 Forward Pressure Bulkhead - ","sectionType":"part","heading":"AD/B737/211 Forward Pressure Bulkhead - 2 6/2003","content":"# AD/B737/211 Forward Pressure Bulkhead \\- 2 6/2003\n\nApplicability: Model 737-300, \\-400, and \\-500 series aircraft; as listed in Boeing Alert Service Bulletin 737-53A1208.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 2001-02-01 Amdt 39-12085.\n\nCompliance: As specified in the Requirement document, with a revised effective date of 12 June 2003.\n\nThis Airworthiness Directive becomes effective on 12 June 2003.\n\nBackground: The FAA requires certain actions intended to prevent fatigue cracking on critical areas of the forward pressure bulkhead, which could result in rapid decompression of the aircraft fuselage.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.jpeg)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 2 May 2003\n\n![](image.001.png)","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD does not expand substantive technical obligations beyond those in FAA AD 2001-02-01. It adopts the FAA requirements for the listed 737 models and only sets a revised effective date (Requirement; Compliance). There is no indication in the text supplied that the set of affected aircraft or the nature of required actions was broadened."},"complexity_factors":["Reference to an external instrument (FAA AD 2001-02-01) rather than standalone text increases dependency on another document for full technical requirements (Requirement).","Technical subject matter (fatigue inspection and repair of a critical structural component) requires specialist maintenance actions and engineering judgement.","Limited applicability to specific aircraft models and a particular Boeing service bulletin narrows scope but requires operators to cross-check multiple documents (Applicability).","Compliance timing is set by the referenced FAA AD but the AD here revises the effective date, creating a minor procedural coordination point (Compliance).","Legal basis delegated under CASR 1998 subreg 39.1(1) centralises decision authority in the CASA delegate, reducing ambiguity about who may mandate corrective action.","Potential operational and cost burden falls on aircraft operators to schedule inspections, ground aircraft if repairs needed, and document compliance."],"plain_english_summary":"This Airworthiness Directive requires operators of Boeing 737-300, -400 and -500 series aircraft listed in Boeing Alert Service Bulletin 737-53A1208 to carry out the inspections and corrective actions set out in FAA AD 2001-02-01 to detect and repair fatigue cracking in the forward pressure bulkhead. It is issued under CASR 1998 subreg 39.1(1) and takes effect 12 June 2003. Operators must follow the FAA AD’s procedures and timing; they bear the cost and responsibility for compliance (Applicability; Requirement; Compliance; Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive. It addresses exactly what it purports to address: a specific structural defect in specific aircraft models. There is no scope creep — it adopts external technical standards by reference and applies them to a clearly defined fleet subset."},"complexity_factors":["Extremely short document (under 300 words)","Only 3 defined elements: applicability (specific aircraft models), requirement (reference to external FAA document), and compliance (single date)","No nested conditions or exceptions — straightforward 'if you have this aircraft, do this action'","Single cross-reference to external FAA directive rather than internal legislative machinery","No interpretation section, no definitions, no penalty clauses, no appeal mechanisms"],"plain_english_summary":"This directive makes the FAA’s AD 2001-02-01 mandatory in Australia: operators of Boeing 737-300/-400/-500 aircraft must inspect and repair the forward pressure bulkhead per the FAA instructions.  \n\nIt addresses fatigue cracking that could cause rapid decompression, and thus prevents a catastrophic loss of cabin pressure. Effective 12 June 2003."},"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-b737-211-forward-pressure-bulkhead-2","history":"/api/acts/ad-b737-211-forward-pressure-bulkhead-2/history","analysis":"/api/acts/ad-b737-211-forward-pressure-bulkhead-2/analysis","conflicts":"/api/acts/ad-b737-211-forward-pressure-bulkhead-2/conflicts","importantCases":"/api/acts/ad-b737-211-forward-pressure-bulkhead-2/important-cases","documents":"/api/acts/ad-b737-211-forward-pressure-bulkhead-2/documents"}}