{"id":"F2006B03129","name":"AD/B747/230 Amdt 1 - Thrust Reverser Checks","slug":"ad-b747-230-amdt-1-thrust-reverser-checks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42501,"registerId":"commonwealth-F2006B03129-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 747 Series Aeroplanes","sectionType":"part","heading":"Boeing 747 Series Aeroplanes","content":"# Boeing 747 Series Aeroplanes\n\nAD/B747/230 Amdt 1 (continued)\n\n    4. If Requirement 3 operational check cannot successfully be carried out in accordance with the procedures in Appendix 1 of FAA AD 2000-02-22, or if any discrepancy is detected during any operational check, repair in accordance with procedures specified in approved maintenance data.\n\n    5. Repeat Requirement 3 operational checks if any discrepancies have been corrected under Requirement 4 during compliance with Requirement 3 or 6.\n\n    6. Repeat and successfully accomplish operational checks required by Requirement 3.","sortOrder":0},{"sectionNumber":"Terminating Action","sectionType":"part","heading":"Terminating Action","content":"# Terminating Action\n\nAccomplishment of Requirement 1 and 2, or installation of an additional locking system during production in accordance with production equivalent PRR 81000- 39, is terminating action for the inspections and tests required by Requirement 3 of AD/B747/277.\n\nNote: FAA AD 2000-02-22 Amendment 39-11540 refers.\n\nCompliance: For Requirement 1: Within 36 months time in service from 13 July 2000 (the effective date of original issue of this Directive).\n\nFor Requirement 2: Prior to or concurrent with Requirement 1 compliance.\n\nFor Requirement 3: Within 3,000 flight hours after accomplishment of Requirement 1 or within 1,000 flight hours from 13 July 2000 (the effective date of original issue of this Directive), whichever occurred later.\n\nFor Requirement 4: Prior to further flight. For Requirement 5: Prior to further flight.\n\nFor Requirement 6: At intervals not exceeding 3,000 flight hours time in service. This Amendment becomes effective on 5 September 2002.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"This amendment adds an explicit requirement to repeat operational checks after maintenance and sets a repeating inspection interval (Requirement 6), and it identifies a terminating action for part of AD/B747/277. These are incremental, targeted changes to the original directive—they refine and extend the inspection regime and provide a specified terminating action, but they do not materially broaden the class of affected aircraft or create a new regulatory programme beyond the original safety purpose."},"complexity_factors":["Cross-reference to FAA AD 2000-02-22 (Appendix 1) for required operational procedures","Reference to another Australian AD (AD/B747/277) and a production document (PRR 81000-39) for terminating action","Multiple conditional requirements (e.g. repeat checks only if discrepancies corrected; repair if check cannot be completed)","Several different compliance time windows and triggers (36 months, 3,000 flight-hours, 1,000 flight-hours, and 'prior to further flight')","Need to use 'approved maintenance data' for repairs (introduces external approval requirement rather than in-text technical procedure)","Terminology and effect concentrated in a small number of numbered requirements (3–6) but with external dependencies"],"plain_english_summary":"**What this directive does (mechanics)\n\n- Applies to: operators and maintenance organisations responsible for Boeing 747 series aeroplanes.  \n\n- Requires: operational checks of the thrust reverser system and follow-up actions when discrepancies are found. Specifically:  \n  - If an operational check called for by Requirement 3 cannot be completed, or finds a problem, the operator must repair the aircraft using approved maintenance data (Requirement 4).  \n  - If a discrepancy is corrected during those checks, the operational checks must be repeated (Requirement 5).  \n  - Operational checks required by Requirement 3 must be repeated successfully at intervals not exceeding 3,000 flight-hours (Requirement 6).  \n\n- Timing (key compliance windows):  \n  - Requirement 1 must be done within 36 months time-in-service from 13 July 2000.  \n  - Requirement 2 must be done prior to or at the same time as Requirement 1.  \n  - Requirement 3 must be done within 3,000 flight-hours after Requirement 1 is done or within 1,000 flight-hours from 13 July 2000, whichever is later.  \n  - Repairs required by Requirement 4 and repeated checks required by Requirement 5 must be completed prior to further flight.  \n  - Ongoing repeat checks (Requirement 6) every 3,000 flight-hours.  \n\n- Terminating action: completing Requirement 1 and 2, or installing an additional locking system during production in accordance with production-equivalent PRR 81000-39, ends the need for the inspections and tests required by Requirement 3 of AD/B747/277 (see \"Terminating Action\").\n\n- Cross-references and standards: the operational check procedures are those in Appendix 1 of FAA AD 2000-02-22, and repairs must follow approved maintenance data.\n\nWhy this was introduced (official rationale, then practical implications)\n\n- Officially: the amendment was added after a safety review that showed an in-flight thrust reverser deployment could greatly reduce aircraft controllability. The directive aims to maintain the fail-safe features of the thrust reverser system and prevent failure modes that could cause inadvertent in-flight deployment (Background).  \n\n- Practical implications for operators and maintenance providers:  \n  - Who pays: aircraft operators pay for the checks, any required repairs, and the operational downtime.  \n  - Who decides how to comply: maintenance organisations must follow the FAA Appendix 1 procedures and any approved maintenance data for repairs; the Civil Aviation Safety Authority enforces compliance.  \n  - Behavioural change required: operators must schedule one‑off compliance checks within the set time windows, repair any faults found, and perform ongoing 3,000 flight‑hour interval checks (Requirement 6). Some operators may choose to pursue the terminating action (if applicable to their airframes) to stop the recurring Requirement 3 inspections.  \n\nCosts, incentives and trade-offs (mechanisms, not opinions)\n\n- Direct costs and time: repeated operational checks and any necessary repairs consume labour, parts and aircraft downtime.  \n- Concentrated vs diffuse effects: the costs fall directly on 747 operators (concentrated); the safety benefit accrues to passengers, crew and the broader flying public (diffuse).  \n- Compliance choices and substitution effects: operators can either comply with the recurring checks or, when eligible, accomplish the terminating action (Requirements 1 and 2 or production-installation per PRR 81000-39). The terminating action may be operationally preferable but is only available in the ways specified (for example, production installation).  \n- Administrative discretion and implementation risk: repairs must be to \"approved maintenance data,\" which requires authorised maintenance organisations or approval from the regulator; this creates a gating role for certificated maintainers and potential scheduling bottlenecks.  \n- Effect on independent businesses: certificated independent maintenance organisations can perform the work if they hold the relevant approvals and data; the AD does not preclude competition among compliant engineers and workshops.  \n\nKey legal references within the directive: Requirement 3 (operational checks), Requirements 4–6 (repairs, repeats, intervals), Terminating Action (relationship to AD/B747/277 and PRR 81000-39), and cross-reference to FAA AD 2000-02-22 (Appendix 1) for the check procedures.\n\n(Sections cited: Requirements 3–6; \"Terminating Action\"; Background; compliance timing statements.)"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This amendment stays within the original scope of addressing thrust reverser safety on Boeing 747 aircraft. It refines and adds procedural requirements (repeated checks after maintenance, terminating action provisions) but does not expand to new aircraft types or unrelated systems. The background explicitly states this amendment does not add aircraft or require additional work on already-modified aircraft."},"complexity_factors":["Multiple cross-references to other directives (AD/B747/277, FAA AD 2000-02-22, PRR 81000-39) requiring external knowledge","Interdependent requirements with conditional logic (Requirements 4, 5, and 6 trigger based on findings in Requirement 3)","Complex compliance timeline with multiple deadlines and alternative calculations ('whichever occurred later')","Technical aviation terminology requiring domain knowledge (thrust reversers, fail safe features, production equivalent PRR)","Nested conditions: Requirement 5 applies only if Requirement 4 was triggered during compliance with Requirement 3 or 6","Terminating action concept requires understanding of relationship between this and previous directive"],"plain_english_summary":"This AD requires Australian operators of Boeing 747s to fit a thrust-reverser locking system, perform initial and recurring operational checks (and repair if checks fail), and repeat checks every 3,000 flight hours. It amends a 2002 directive to add repeated post‑maintenance checks and allows prior inspections to be terminated once the locking system is installed. It aims to prevent accidental in‑flight thrust reverser deployment, a hazard that can cause catastrophic loss of control."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-230-amdt-1-thrust-reverser-checks","history":"/api/acts/ad-b747-230-amdt-1-thrust-reverser-checks/history","analysis":"/api/acts/ad-b747-230-amdt-1-thrust-reverser-checks/analysis","conflicts":"/api/acts/ad-b747-230-amdt-1-thrust-reverser-checks/conflicts","importantCases":"/api/acts/ad-b747-230-amdt-1-thrust-reverser-checks/important-cases","documents":"/api/acts/ad-b747-230-amdt-1-thrust-reverser-checks/documents"}}