{"id":"F2006B03171","name":"AD/B747/275 - Thrust Reverser Inspections, Modifications and Tests","slug":"ad-b747-275-thrust-reverser-inspections-modifications-and-tests","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42543,"registerId":"commonwealth-F2006B03171-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Spares","sectionType":"part","heading":"Spares","content":"# Spares\n\nIf, after incorporation of the modification required by Requirement 1(b) of this Directive, it becomes necessary to install a thrust reverser assembly that does not have the TRAS locks installed, the aeroplane may be dispatched in accordance with the conditions and limitations specified in the MEL approved for that aeroplane by registration mark, provided that the thrust reverser assembly that does not have the TRAS locks installed is deactivated in accordance with approved maintenance data.\n\nNo more than one thrust reverser on any aeroplane may be deactivated under the provisions of this paragraph. Within 10 days after deactivation of the thrust reverser, install a thrust reverser assembly that has the TRAS locks installed, reactivate the thrust reverser and functionally test in accordance with the appropriate approved maintenance data. Repair in accordance with the procedures specified in the appropriate approved maintenance data if any discrepancy is detected while carrying out the tests.","sortOrder":0},{"sectionNumber":"Terminating Action","sectionType":"part","heading":"Terminating Action","content":"# Terminating Action\n\nAccomplishment of the actions contained in Requirement 1(b) terminates the repetitive inspections required by Requirement 1(a) and 5 of this AD.\n\nAccomplishment of the installation specified in Boeing SB 747-78-2150, dated 20 March, 1997, terminates the requirement to comply with the installation contained in Requirement 1(b) of this AD.\n\nNote: FAA AD 2000-14-11 Amdt 39-11821 refers\n\nCompliance: For Requirement 1(a) OR (b): Prior to the issue of a Certificate of Airworthiness.\n\nFor Requirement 2: At intervals not exceeding 1,500 flight hours until accomplishment of Requirement 1(b).\n\nFor Requirement 3: Within 3,000 flight hours after accomplishment of Requirement 1(b) modifications.\n\nFor Requirement 4(a): At intervals not exceeding 3,000 flight hours. For Requirement 4(b) and (c): Prior to further flight.\n\nFor Requirement 5: Prior to the issue of a Certificate of Airworthiness.\n\nFor Requirement 6: At intervals not exceeding 18 months until accomplishment of Requirement 1(b).\n\nFor Requirement 7(a) or (b): Prior to further flight.\n\nFor Requirement 7(c): Within 10 days after thrust reverser deactivation in accordance with the provisions of Requirement 7(b).\n\nFor Requirement 7(d) and (e): Prior to further flight.\n\nThis Airworthiness Directive becomes effective on 11 July 2002.","sortOrder":1}],"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":5,"scope_assessment":{"changed":false,"description":"The instrument itself does not indicate any change from its original scope. It prescribes required inspections, modifications, tests, temporary dispatch conditions for non‑compliant spares, and specified terminating actions limited to thrust reverser assemblies and associated maintenance/certification steps."},"complexity_factors":["Multiple, staggered compliance intervals and deadlines (e.g. 1,500 flight hours, 3,000 flight hours, 18 months, 10 days; see 'Compliance').","Conditional temporary dispatch governed by the operator's approved MEL and a requirement that the spare be deactivated per approved maintenance data ('Spares').","Operational limit that no more than one thrust reverser may be deactivated under the Spares provision ('Spares').","Dependence on approved maintenance data for deactivation, reactivation, functional testing and repair (Spares; test/repair instructions referenced throughout).","Terminating actions reference both accomplishment of Requirement 1(b) and installation via Boeing SB 747-78-2150, creating dependency on an external service bulletin ('Terminating Action').","Cross-references between multiple Requirements and to an FAA AD increase interpretive complexity (various 'Requirement' cross-references; note referencing FAA AD 2000-14-11).","Mix of action types to manage (inspections, modifications, tests, deactivations/reactivations, repairs) requiring coordination between maintenance and certification processes.","Several actions are mandated 'prior to further flight' or 'prior to issue of a Certificate of Airworthiness', imposing scheduling constraints on operators and certifying authorities (see 'Compliance')."],"plain_english_summary":"This Airworthiness Directive requires installation of TRAS locks on Boeing 747 thrust reversers and sets inspections, tests, temporary dispatch limits, and terminating actions. It affects aircraft operators, maintenance organisations and certificating authorities: operators pay for parts and work, may temporarily dispatch an aeroplane with one deactivated reverser under their approved MEL (Spares), must reinstall a compliant assembly within 10 days, and follow the prescribed inspection and interval requirements until termination (Terminating Action)."},"kimi_summary":{"content_quality":"ok","complexity_score":6,"scope_assessment":{"changed":false,"description":"This appears to be a focused aviation safety directive addressing a specific technical issue (Boeing 747 thrust reverser systems). The scope remains tightly constrained to its original purpose of mandating inspections and modifications for this particular aircraft system. No evidence of scope creep into broader operational areas."},"complexity_factors":["Multiple interdependent requirements (Requirements 1-7) with cross-references between them (e.g., Requirement 1(b) terminates Requirements 1(a) and 5)","Nested conditional logic: temporary dispatch permitted only if MEL approved by specific registration mark AND only one reverser deactivated AND 10-day replacement deadline met","Multiple compliance timeframes using different metrics: flight hours (1,500; 3,000), calendar time (18 months, 10 days), and event-based triggers (prior to Certificate of Airworthiness, prior to further flight, after deactivation)","Reference to external documents without full reproduction: Boeing SB 747-78-2150, FAA AD 2000-14-11 Amdt 39-11821, and undefined \"approved maintenance data\"","Undefined technical acronyms assumed to be known: TRAS (Thrust Reverser Actuation System), MEL (Minimum Equipment List), SB (Service Bulletin)","Fragmentary structure with apparent formatting errors (duplicate headers: \"Spares Spares\", \"Terminating Action Terminating Action\") suggesting this is an excerpt rather than complete instrument"],"plain_english_summary":"This mandatory Airworthiness Directive orders operators of Boeing 747s in Australia to inspect, modify, test and fit special TRAS locks to thrust reversers on a set schedule to prevent mechanical failures. It imposes strict compliance deadlines, limited short-term allowances for using unequipped spares, and stops some repetitive inspections once modifications are complete. It targets airlines, maintenance teams and safety inspectors to eliminate a risk that has caused fatal accidents."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-275-thrust-reverser-inspections-modifications-and-tests","history":"/api/acts/ad-b747-275-thrust-reverser-inspections-modifications-and-tests/history","analysis":"/api/acts/ad-b747-275-thrust-reverser-inspections-modifications-and-tests/analysis","conflicts":"/api/acts/ad-b747-275-thrust-reverser-inspections-modifications-and-tests/conflicts","importantCases":"/api/acts/ad-b747-275-thrust-reverser-inspections-modifications-and-tests/important-cases","documents":"/api/acts/ad-b747-275-thrust-reverser-inspections-modifications-and-tests/documents"}}