{"id":"F2006B03186","name":"AD/B747/292 - BS 2360 Aft Pressure Bulkhead Outer Chord Bolts","slug":"ad-b747-292-bs-2360-aft-pressure-bulkhead-outer-chord-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42558,"registerId":"commonwealth-F2006B03186-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/292 - BS 2360 Aft Pressure Bulkhead Outer Chord Bolts","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Safety 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\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 747 Series Aeroplanes\n\nAD/B747/292 BS 2360 Aft Pressure Bulkhead Outer Chord\n\nBolts\n\n  \n8/2003\n\nApplicability: Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200F, 747-200C, 747-\n\n300, 747SR, and 747SP series aircraft, with line numbers 1 through 644.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 2003-11-25 Amdt 39-13185.\n\nNote: Boeing Alert Service Bulletin 747-53A2474 refers.\n\nCompliance: As specified in the Requirement document, with a revised effective date of 7 August 2003.\n\nThis Airworthiness Directive becomes effective on 7 August 2003.\n\nBackground: This Directive requires identification of all H-11 steel bolts on the outer chord of body station (BS) 2360 aft pressure bulkhead between stingers 12L and 12R; follow- on inspections of all remaining H-11 steel bolts, corrective actions, and eventual replacement of all H-11 steel bolts with Inconel bolts.\n\n![Signature of David Punshon, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nDavid Punshon\n\nDelegate of the Civil Aviation Safety Authority 27 June 2003\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 16 July 2003.\n\n  \nPage 1 of 1","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD implements the FAA AD and Boeing service bulletin for the same unsafe condition on BS 2360 outer chord bolts and limits applicability to Boeing 747 line numbers 1–644 (see Applicability; Requirement; Background). It does not expand the component or fleet scope beyond those referenced documents."},"complexity_factors":["Cross-reference to external FAA AD (2003-11-25) and Boeing Alert Service Bulletin 747-53A2474 — requires operators to follow another regulator's technical mandate rather than standalone text.","Technical identification of material type (H‑11 steel) on specific fasteners — may require metallurgical verification and detailed inspection procedures.","Requirement for follow‑on inspections, corrective actions and eventual replacement with Inconel bolts — introduces multi‑stage compliance scheduling.","Applicability spans multiple 747 variants and specific line numbers (1–644) — creates a non‑uniform fleet applicability and tracking complexity.","Operational impact: parts sourcing (Inconel bolts), maintenance man‑hours and aircraft downtime for affected operators.","Record‑keeping and regulatory compliance obligations tied to CASR subregulation 39.1(1) and the AD's Compliance timing.","Potential need for engineering authority approvals or Supplemental Type Certificates if work affects structural life limits or modifications.","Enforcement and verification rely on CASA delegation and inspection of maintenance records (Delegate signature noted)."],"plain_english_summary":"This Airworthiness Directive requires identification, inspection, corrective action and replacement of H‑11 steel bolts on the outer chord of the aft pressure bulkhead at body station 2360 for specified Boeing 747 models (line numbers 1–644). It mandates compliance with FAA AD 2003-11-25 and Boeing Alert Service Bulletin 747-53A2474 (Requirement; Compliance), effective 7 August 2003.\n\nOperators must carry out inspections, repairs and eventual replacement with Inconel bolts at their expense; this will create maintenance time, parts‑procurement needs and record‑keeping obligations."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope. It addresses a specific unsafe condition (potential failure of H-11 steel bolts on the aft pressure bulkhead) on specific aircraft models. The document does not show scope creep — it remains a targeted safety directive for a defined mechanical issue rather than expanding into broader operational or maintenance requirements."},"complexity_factors":["Short, single-page document with straightforward structure","Only 3 defined/model terms (line numbers, body station, stringers) — all standard aviation terminology","Single cross-reference to FAA AD 2003-11-25 and Boeing Service Bulletin 747-53A2474 (external technical documents contain the detailed procedures)","No nested exceptions or conditional logic — compliance is mandatory with clear effective date","Technical specificity limited to aircraft model applicability and bolt location; actual engineering instructions are incorporated by reference rather than included in the text"],"plain_english_summary":"This AD is a mandatory FAA safety order requiring operators of early-production Boeing 747s (P/Line 1–644, models -100 through -SP series listed) to find, inspect, and ultimately replace H‑11 steel bolts at the aft pressure bulkhead (BS 2360, between stringers 12L/12R). \n\nIt matters because failure of those bolts could cause rapid decompression or structural damage; compliance follows FAA AD 2003‑11‑25 and Boeing Alert Service Bulletin 747‑53A2474."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-292-bs-2360-aft-pressure-bulkhead-outer-chord-bolts","history":"/api/acts/ad-b747-292-bs-2360-aft-pressure-bulkhead-outer-chord-bolts/history","analysis":"/api/acts/ad-b747-292-bs-2360-aft-pressure-bulkhead-outer-chord-bolts/analysis","conflicts":"/api/acts/ad-b747-292-bs-2360-aft-pressure-bulkhead-outer-chord-bolts/conflicts","importantCases":"/api/acts/ad-b747-292-bs-2360-aft-pressure-bulkhead-outer-chord-bolts/important-cases","documents":"/api/acts/ad-b747-292-bs-2360-aft-pressure-bulkhead-outer-chord-bolts/documents"}}