{"id":"F2006B03032","name":"AD/B747/130 Amdt 1 - Thrust Reverser Control System Modification","slug":"ad-b747-130-amdt-1-thrust-reverser-control-system-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42391,"registerId":"commonwealth-F2006B03032-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/130 Amdt 1 - Thrust Reverser Control System Modification","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation 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\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B747/130 and issues the following AD under subregulation 39.1 (1) of CAR 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\nBoeing 747 Series Aeroplanes\n\nAD/B747/130\n\nAmdt 1\n\n  \nThrust Reverser Control System Modification 7/2002\n\nApplicability: All Boeing 747-100, \\-200, and \\-300 aircraft fitted with Pratt & Whitney JT9D series engines.\n\nRequirement: 1: Incorporate a solenoid-operated shut-off valve into the thrust reverser control system in accordance with Boeing Service Bulletin 747-78-2052, either Rev.3 dated 27 August 1987 or Rev.4 dated 23 March 1989.\n\n2: When engine replacement is required, only engines modified in accordance with Requirement 1 are to be installed on an affected aircraft.\n\nNote: FAA AD 94-10-10 Amdt 39-8917 refers.\n\nCompliance: For Requirement 1: No later than 18 August 1997.\n\nFor Requirement 2: After the effective date of this Directive. This Amendment becomes effective on 11 July 2002.\n\nBackground: This amendment makes no technical changes to the contents of the Directive.\n\nTherefore, no further action is required for aircraft/engines already in compliance with the original Directive. The Directive was prompted by incidents being reported of in- flight deployment of the engine fan thrust reverser. The actions contained in this Directive are intended to prevent such a deployment, which could result in reduced controllability of the aeroplane.\n\nThe original issue of this Airworthiness Directive became effective on 18 August 1994.\n\n![Signature of James Coyne, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nJames Coyne\n\n![](image.001.png)Delegate of the Civil Aviation Safety Authority 28 May 2002\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 19 June 2002.\n\n  \n\nPage 1 of 1","sortOrder":0}],"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 amendment states explicitly that it \"makes no technical changes to the contents of the Directive.\" The Directive's substantive requirements, applicability, and compliance obligations remain as originally issued; the amendment updates the effective/notification dates (effective 11 July 2002; notified in Gazette 19 June 2002) without expanding or narrowing scope."},"complexity_factors":["Technical retrofit requiring maintenance/engineering work to incorporate the solenoid-operated shut-off valve per Boeing Service Bulletin 747-78-2052 (Rev.3 or Rev.4).","Narrow applicability: only Boeing 747-100/ -200/ -300 airframes fitted with Pratt & Whitney JT9D engines — tracking affected fleet and serials is required.","Operational constraint on future engine installations: only modified engines may be installed on affected aircraft, affecting logistics and parts pools.","Fixed compliance timeline for retrofit (no later than 18 August 1997) and an effective amendment date (11 July 2002), requiring retrospective compliance tracking.","Regulatory cross-reference to FAA AD 94-10-10, creating inter-jurisdictional compliance considerations for operators and maintainers."],"plain_english_summary":"This directive requires installing a solenoid-operated shut-off valve into the thrust-reverser control system on Boeing 747‑100/‑200/‑300 aeroplanes with Pratt & Whitney JT9D engines, and bars fitting replacement engines unless they have the same modification. CASA (through its delegate) issues and enforces the rule; aircraft operators pay for and arrange the modification and must meet the directive’s deadlines to reduce the risk of in‑flight fan-thrust-reverser deployment that could impair controllability."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment explicitly states it makes 'no technical changes to the contents of the Directive.' It is purely administrative, updating the effective date and revoking the previous version without expanding the scope beyond the original safety modification requirement for thrust reverser systems on specific Boeing 747 variants."},"complexity_factors":["Single page document with minimal text","Only 2 substantive requirements (modification installation and engine replacement restriction)","Clear applicability section limiting scope to specific aircraft models and engine types","Simple compliance timeline with fixed dates","No defined terms section or complex cross-referencing within the instrument itself","Single external reference to FAA AD (informational only)","Amendment makes no technical changes - purely administrative update"],"plain_english_summary":"This safety order mandates adding a solenoid-operated shut-off valve to the thrust-reverser control system on Boeing 747-100/200/300s with Pratt & Whitney JT9D engines to prevent accidental in-flight reverser deployment, and limits future engine swaps to engines carrying the same modification. It affects operators and maintenance providers of those aircraft; no further action is needed if the original 1994 modification was already completed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-130-amdt-1-thrust-reverser-control-system-modification","history":"/api/acts/ad-b747-130-amdt-1-thrust-reverser-control-system-modification/history","analysis":"/api/acts/ad-b747-130-amdt-1-thrust-reverser-control-system-modification/analysis","conflicts":"/api/acts/ad-b747-130-amdt-1-thrust-reverser-control-system-modification/conflicts","importantCases":"/api/acts/ad-b747-130-amdt-1-thrust-reverser-control-system-modification/important-cases","documents":"/api/acts/ad-b747-130-amdt-1-thrust-reverser-control-system-modification/documents"}}