{"id":"F2007L04142","name":"AD/B727/207 - Aft Pressure Bulkhead Web","slug":"ad-b727-207-aft-pressure-bulkhead-web","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":70239,"registerId":"commonwealth-F2007L04142-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 727 Series Aeroplanes","sectionType":"division","heading":"Boeing 727 Series Aeroplanes","content":"### Boeing 727 Series Aeroplanes\n\n| AD/B727/207 | Aft Pressure Bulkhead Web | 13/2007 DM |\n| ----------- | ------------------------- | ---------- |\n\n| Applicability: | All Boeing Model 727, 727C, 727-100, 727-100C, 727-200, and 727-200F series aircraft.                                                                                                                                                                                                                                                 |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2007-21-04.Note: Boeing Special Attention Service Bulletin 727-53-0230, dated 8 January 2007, refers.                                                                                                                                                                  |\n| Compliance:    | In accordance with Requirement document, with a revised effective date of16 November 2007.                                                                                                                                                                                                                                            |\n|                | This Airworthiness Directive becomes effective on 16 November 2007.                                                                                                                                                                                                                                                                   |\n| Background:    | This Airworthiness Directive results from reports of cracking in the aft pressure bulkhead web. Cracking of this type may result in rapid decompression of the aircraft.This Airworthiness Directive requires an initial inspection for cracks in the aft pressure bulkhead web, as well as rectification action if cracks are found. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n15 October 2007","sortOrder":0},{"sectionNumber":"AD/B727/207","sectionType":"part","heading":"AD/B727/207","content":"## AD/B727/207","sortOrder":1},{"sectionNumber":"Aft Pressure Bulkhead Web","sectionType":"part","heading":"Aft Pressure Bulkhead Web","content":"## Aft Pressure Bulkhead Web","sortOrder":2},{"sectionNumber":"13/2007 DM","sectionType":"part","heading":"13/2007 DM","content":"## 13/2007 DM","sortOrder":3}],"analysis":{"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument applies to all Boeing 727-series aircraft and directs compliance with FAA AD 2007-21-04 and Boeing SB 727-53-0230. The only amendment shown in the text is a revised effective date (16 November 2007); there is no change to the population of affected aircraft or the substantive inspection/repair requirement."},"complexity_factors":["Applicability covers all Boeing Model 727, 727C, 727-100, 727-100C, 727-200, and 727-200F series aircraft (source: Applicability).","Direct cross-reference to an external mandatory instrument: FAA AD 2007-21-04 (source: Requirement), which requires operators to follow another regulator's technical mandates rather than reproducing procedures in full.","Reference to a manufacturer's service bulletin for technical detail: Boeing Special Attention Service Bulletin 727-53-0230, dated 8 January 2007 (source: Note in Requirement).","Compliance timing specified and an explicit effective date (revised effective date 16 November 2007) creates an administrative deadline for operators (source: Compliance).","Operational burden: requires initial inspection and corrective action if cracks are found, implying labour, downtime and potential parts/repair costs for operators (source: Background & Requirement).","Technical assessment and rectification rely on maintenance organisations' judgement and access to Boeing/FAA procedures—some implementation discretion lies with those organisations but within the AD's mandatory frame (source: Requirement/Note)."],"plain_english_summary":"Requires operators of all Boeing 727-series aeroplanes to inspect the aft pressure-bulkhead web for cracks and to carry out repairs if cracks are found, by following FAA AD 2007-21-04 and Boeing Special Attention Service Bulletin 727-53-0230. It targets an identified safety risk (possible rapid decompression) and matters because it imposes inspection and repair obligations on aircraft owners/operators."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive addressing a specific safety issue (cracking in a structural component). It has not expanded beyond its original purpose of ensuring the airworthiness of Boeing 727 aircraft."},"complexity_factors":["Very short document (under 300 words)","Only one substantive requirement: inspect and repair if needed","Single cross-reference to FAA AD 2007-21-04 and Boeing Service Bulletin 727-53-0230","No defined terms section","No conditional logic or nested exceptions — straightforward applicability to all listed models","Standard AD format with clear compliance date"],"plain_english_summary":"This AD mandates inspection of the aft pressure bulkhead web on all Boeing 727 series aircraft in Australia and requires repair if cracks are found. It targets airlines, cargo operators and private owners to prevent dangerous rapid decompression. Actions must follow FAA AD 2007‑21‑04 and Boeing service instructions; the directive took effect 16 November 2007."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-207-aft-pressure-bulkhead-web","history":"/api/acts/ad-b727-207-aft-pressure-bulkhead-web/history","analysis":"/api/acts/ad-b727-207-aft-pressure-bulkhead-web/analysis","conflicts":"/api/acts/ad-b727-207-aft-pressure-bulkhead-web/conflicts","importantCases":"/api/acts/ad-b727-207-aft-pressure-bulkhead-web/important-cases","documents":"/api/acts/ad-b727-207-aft-pressure-bulkhead-web/documents"}}