{"id":"F2006B03149","name":"AD/B747/250 Amdt 1 - Thrust Reverser","slug":"ad-b747-250-amdt-1-thrust-reverser","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42521,"registerId":"commonwealth-F2006B03149-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Terminating Action","sectionType":"part","heading":"Terminating Action","content":"# Terminating Action\n\nInstallation of the additional locking systems accomplished prior to the effective date of this Directive in accordance with Boeing SB 747-78-2155, Revision 1. dated 30 January 1997, satisfy the requirements of Requirement 1(a).\n\nInstallation of the additional locking systems accomplished prior to the effective date of this Directive in accordance with Boeing SB 747-78-2154, Revision 1. dated 2 November 1995 and Revision 2, dated 31 October 1996, satisfy the requirements of Requirement 1(d).","sortOrder":0},{"sectionNumber":"Boeing 747 Series Aeroplanes","sectionType":"part","heading":"Boeing 747 Series Aeroplanes","content":"# Boeing 747 Series Aeroplanes\n\nAD/B747/250 Amdt 1 (continued)\n\nFor aeroplanes having line numbers 1067 and higher on which the intent of Boeing SB 747-78- 2155, Revision 2. dated 5 November, 1998, was accomplished during production, accomplishment of the repetitive functional tests required by Requirement 4 of this Directive is terminating action for the repetitive inspections and functional tests required by Requirement 1 of AD/B747/277.\n\nAccomplishment of the requirements of this Directive is also terminating action for the repetitive inspections and functional tests required by Requirement 1 of AD/B747/277.\n\nNote: FAA AD 2001-12-21 Amendment 39-11799, and 94-15-05 Amendment 39-8976 refer.\n\nCompliance: For Requirement 1: Prior to issue of Certificate of Airworthiness. For Requirement 2: Prior to issue of Certificate of Airworthiness. For Requirement 3: Prior to further flight.\n\nFor Requirement 4: At intervals not exceeding 4000 hours time- in-service. This Amendment becomes effective on 5 September 2002.\n\nBackground: This amendment includes a number of editorial and technical changes to better represent the requirements of FAA AD 2000-12-21. This Directive was issued to prevent inadvertent deployment of the thrust reverser during flight and consequent reduced controllability of the aeroplane.\n\nThe original issue of this Airworthiness Directive became effective on 9 August 2001.\n\n![Signature of Eugene Paul Holzapfel, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 25 July 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 14 August 2002.","sortOrder":1}],"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":4,"scope_assessment":{"changed":false,"description":"The amendment primarily clarifies and aligns Australian requirements with FAA AD 2000-12-21 and recognises certain prior Boeing SB installations as terminating actions. Background: \"This amendment includes a number of editorial and technical changes to better represent the requirements of FAA AD 2000-12-21.\" The directive does not, on its face, expand the class of affected aircraft beyond the Boeing 747 series but refines compliance pathways and effective dates."},"complexity_factors":["Multiple cross-references to Boeing Service Bulletins (SB 747-78-2154 and SB 747-78-2155) with specific revision dates and acceptance as terminating action.","Links and dependency on prior Airworthiness Directives (AD/B747/277) and FAA ADs (FAA AD 2001-12-21 and 94-15-05) create layered compliance obligations.","Differentiated treatment by production line number (line numbers 1067 and higher) affects whether production accomplishment changes ongoing inspection obligations.","Varied compliance timings: some requirements due before Certificate of Airworthiness, others prior to further flight, and recurring tests at fixed flight-hour intervals (4000 hours).","Document includes editorial and technical amendments to align with FAA requirements, requiring operators to confirm which revision/version of service information applies."],"plain_english_summary":"This Airworthiness Directive requires Boeing 747 operators to fit additional thrust-reverser locking systems or to rely on prior installations done under specified Boeing service bulletins as terminating compliance. It also mandates recurrent functional tests at intervals not exceeding 4,000 flight hours and sets specific deadlines for compliance (e.g. before issue of a Certificate of Airworthiness or before further flight) (see \"Terminating Action\" and \"Compliance\").\n\nOperators and maintenance organisations bear the cost and operational impact of installations and recurring tests; the Civil Aviation Safety Authority enforces compliance. The stated purpose is to prevent inadvertent in-flight thrust-reverser deployment."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This amendment remains focused on its original purpose: preventing inadvertent thrust reverser deployment on Boeing 747 aircraft. The changes are editorial and technical updates to better align with FAA requirements, not an expansion of scope. The terminating action provisions and production line number distinctions are refinements to implementation, not scope creep."},"complexity_factors":["Multiple cross-references to other Airworthiness Directives (AD/B747/277) and FAA ADs (2001-12-21, 94-15-05)","Specific Boeing Service Bulletin references with multiple revision dates (SB 747-78-2155 Revisions 1 and 2; SB 747-78-2154 Revisions 1 and 2)","Conditional applicability based on aircraft production line numbers (\"line numbers 1067 and higher\")","Different compliance deadlines for four separate requirements","Terminating action provisions that stop earlier repetitive inspection requirements if certain conditions are met","Technical aviation terminology requiring domain knowledge (thrust reversers, Certificates of Airworthiness, time-in-service)"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Boeing 747s to install additional locking systems on thrust reversers and perform functional tests every 4,000 flight hours (with some actions due before further flight or before issuing a Certificate of Airworthiness). It updates the 2001 directive to align with FAA standards and clarifies compliance steps — preventing accidental in‑flight reverser deployment, a known cause of fatal accidents, and affecting operators and maintenance organisations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-250-amdt-1-thrust-reverser","history":"/api/acts/ad-b747-250-amdt-1-thrust-reverser/history","analysis":"/api/acts/ad-b747-250-amdt-1-thrust-reverser/analysis","conflicts":"/api/acts/ad-b747-250-amdt-1-thrust-reverser/conflicts","importantCases":"/api/acts/ad-b747-250-amdt-1-thrust-reverser/important-cases","documents":"/api/acts/ad-b747-250-amdt-1-thrust-reverser/documents"}}