{"id":"F2009L01841","name":"AD/B767/251 - Aft Pressure Bulkhead","slug":"ad-b767-251-aft-pressure-bulkhead","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":78846,"registerId":"commonwealth-F2009L01841-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 767 Series Aeroplanes","sectionType":"division","heading":"Boeing 767 Series Aeroplanes","content":"### Boeing 767 Series Aeroplanes\n\n| AD/B767/251 | Aft Pressure Bulkhead | 6/2009 |\n| ----------- | --------------------- | ------ |\n\n| Applicability: | Model 767-200 and 767-300 series aircraft, as identified in Boeing Alert Service Bulletin 767-53A0147, dated 16 August 2007, or later FAA approved revision.                                                                                                                                                                                                                                                                                                                    |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2009-06-19Amdt 39-15856.                                                                                                                                                                                                                                                                                                                                                                                         |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of4 June 2009.                                                                                                                                                                                                                                                                                                                                                                                          |\n|                | This Airworthiness Directive becomes effective on 4 June 2009.                                                                                                                                                                                                                                                                                                                                                                                                                  |\n| Background:    | FAA AD 2009-06-19 results from analysis that indicates fatigue cracks of the web lap splice, tear strap splice, or super tear strap splice of the aft bulkhead are expected to occur on certain Model 767-200 and -300 series aircraft. Undetected fatigue cracking of the aft pressure bulkhead could result in rapid decompression of the aircraft and possible damage or interference with aircraft control systems, and consequent loss of controllability of the aircraft. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n17 April 2009","sortOrder":0},{"sectionNumber":"AD/B767/251","sectionType":"part","heading":"AD/B767/251","content":"## AD/B767/251","sortOrder":1},{"sectionNumber":"Aft Pressure Bulkhead","sectionType":"part","heading":"Aft Pressure Bulkhead","content":"## Aft Pressure Bulkhead","sortOrder":2},{"sectionNumber":"6/2009","sectionType":"part","heading":"6/2009","content":"## 6/2009","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":3,"scope_assessment":{"changed":false,"description":"The directive adopts the technical requirements of the cited FAA AD and identifies affected aircraft by reference to the Boeing service bulletin; the only explicit change noted in the instrument is a revised effective date (4 June 2009). It does not expand applicability or add obligations beyond those in the referenced FAA AD and Boeing service bulletin."},"complexity_factors":["Direct cross-reference to an external FAA AD (FAA AD 2009-06-19Amdt 39-15856) requires users to consult and follow another jurisdiction's mandatory text.","Applicability is defined by a specific Boeing Alert Service Bulletin (767-53A0147), creating dependency on a manufacturer document for aircraft identification and procedure details.","Technical nature of required work (inspections and repairs for aft pressure bulkhead web/tear strap splices) requires specialised maintenance, engineering judgment and possible non-routine structural repairs.","Administrative coordination due to a revised effective date (4 June 2009) and the need for operators to schedule inspections within specified timeframes.","Safety-critical consequences (rapid decompression, potential interference with control systems) raise enforcement and compliance priority despite the procedural simplicity of adoption.","Record-keeping and certification obligations for completed work impose ongoing compliance and audit risk for operators.","Operational impact risk: inspections and repairs can cause aircraft downtime and direct maintenance costs for owners/operators."],"plain_english_summary":"**This Airworthiness Directive requires operators of certain Boeing 767-200 and 767-300 aircraft to carry out the inspections and corrective actions set out in FAA AD 2009-06-19 (as amended) and Boeing Alert Service Bulletin 767-53A0147.**\n\nIt targets possible fatigue cracking in the aft pressure bulkhead that could cause rapid decompression or affect control systems; owners/operators must inspect, repair and record the work, creating maintenance costs and operational downtime."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive focused on a specific safety defect in specific aircraft. It has not expanded beyond its original purpose of addressing fatigue cracking in the aft pressure bulkhead of Boeing 767-200 and -300 series aircraft."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined applicability criterion (specific Boeing models)","Single cross-reference to external technical document (FAA AD 2009-06-19)","No nested conditions or exceptions — straightforward mandatory compliance","Technical content is 'incorporated by reference' rather than spelled out in the text itself"],"plain_english_summary":"This Airworthiness Directive requires operators of certain Boeing 767-200/-300 series to inspect and, if needed, repair the aft pressure bulkhead because the FAA found fatigue cracks can cause rapid decompression and damage flight controls. Affected operators listed in Boeing’s August 2007 bulletin must follow FAA AD 2009-06-19; this Australian AD took effect 4 June 2009."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-251-aft-pressure-bulkhead","history":"/api/acts/ad-b767-251-aft-pressure-bulkhead/history","analysis":"/api/acts/ad-b767-251-aft-pressure-bulkhead/analysis","conflicts":"/api/acts/ad-b767-251-aft-pressure-bulkhead/conflicts","importantCases":"/api/acts/ad-b767-251-aft-pressure-bulkhead/important-cases","documents":"/api/acts/ad-b767-251-aft-pressure-bulkhead/documents"}}