{"id":"F2006B03173","name":"AD/B747/277 Amdt 2 - Thrust Reverser Inspections and Tests","slug":"ad-b747-277-amdt-2-thrust-reverser-inspections-and-tests","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42545,"registerId":"commonwealth-F2006B03173-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Alternative Means of Compliance (AMOC):","sectionType":"part","heading":"Alternative Means of Compliance (AMOC):","content":"# Alternative Means of Compliance (AMOC):\n\nFor aeroplanes on which the intent of Boeing SB 747-78- 2151 Revision 2, dated 13 January 2000, was accomplished during production, or retrofitted subsequently, and implementing the periodic checks of both the electro- mechanical brake/lock and Centre Drive Unit (CDU) cone brake as detailed in FAA Alternative Means of Compliance (AMOC) document, reference 99-140S- 295, dated 13 August 1999, is an alternative means of compliance to Requirement 2 of this Directive.\n\n    3. Rolls-Royce RB211-524G/H series engines:\n\n    Carry out inspections and functional tests of the thrust reverser control and indication systems in accordance with paragraphs III.D. to III.K. of the Accomplishment Instructions of Boeing Service Bulletin 747-78-2115, dated 28 October 1993; or paragraphs III.D. to III.L. of the Accomplishment Instructions of Boeing Alert Service Bulletin 747-78A2115 Revision 1, dated 4 March 1994.\n\n    b. Repeat the inspections and functional tests of Requirement 3(a).\n\nCompliance with AD/B747/230 Amdt 1 is terminating action for all of Requirement 3.\n\n    4. If any of the inspections and/or functional tests required by this Airworthiness Directive cannot be successfully carried out, or if any discrepancy is found during those inspections and/or functional tests, correct the discrepancy found in accordance with:\n\n    For Pratt & Whitney PW4000 series engines: Boeing Service Bulletin (SB) 747-78-2112, dated 11 November 1993, or Boeing Alert SB 747-78A2112 Revision 1, dated 7 March 1994.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":6,"scope_assessment":{"changed":false,"description":"This appears to be a focused technical amendment to an existing airworthiness directive. The scope remains tightly constrained to thrust reverser safety inspections for specific Boeing 747 engine configurations. The alternative compliance pathway and terminating action provisions are typical of aviation safety regulation and do not represent scope creep."},"complexity_factors":["Heavy reliance on external technical documents (Boeing Service Bulletins, FAA AMOC documents) that are not reproduced in the text","Multiple engine type variants with different compliance paths (Rolls-Royce vs Pratt & Whitney)","Nested conditional logic: alternative compliance paths depend on production history and prior modifications","Cross-references to terminating actions (compliance with AD/B747/230 Amdt 1 ends certain obligations)","Specific document versioning requirements (Revision 1, dated 4 March 1994, etc.)","Fragmentary structure — appears to be an excerpt rather than complete directive, missing introductory context and full requirement numbering"],"plain_english_summary":"This mandatory airworthiness directive orders operators of Boeing 747s to perform specified inspections and functional tests of thrust reverser control and indication systems, and to repair any defects following Boeing service instructions. It includes an alternative compliance path for certain modified aircraft.\n\nIt applies to 747s with Rolls‑Royce RB211‑524G/H or Pratt & Whitney PW4000 engines and matters because preventing uncommanded thrust‑reverser deployment is critical to flight safety."},"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":7,"scope_assessment":{"changed":true,"description":"The directive narrows application of Requirement 2 for aeroplanes where Boeing SB 747-78-2151 Rev 2 was implemented (production or retrofit) by permitting an FAA AMOC as an alternative (AMOC paragraph). It also makes Requirement 3 contingent on engine type and provides a terminating action—compliance with AD/B747/230 Amdt 1 cancels Requirement 3—thereby changing which aircraft/engines remain subject to the inspections (Requirement 3 note)."},"complexity_factors":["Cross-references to multiple external documents (Boeing service bulletins and an FAA AMOC) which must be consulted to comply (AMOC paragraph; Requirement 3; Requirement 4).","Alternative compliance path conditional on whether Boeing SB 747-78-2151 Rev 2 was implemented in production or retrofit (AMOC paragraph).","Engine-specific requirements: distinct instructions for Rolls-Royce RB211-524G/H versus Pratt & Whitney PW4000 series engines (Requirement 3; Requirement 4).","Terminating action cross-reference: compliance with AD/B747/230 Amdt 1 removes Requirement 3, creating inter-directive dependency (Requirement 3 note).","Technical operational obligations (inspections and functional tests of thrust reverser control/indication systems) requiring specialised maintenance skills and equipment (Requirement 3(a)).","Corrective-action references point to other service bulletins for repairs, so compliance depends on following those external procedures precisely (Requirement 4).","Conditional language and scope limits increase administrative burden for operators to determine which path applies to each aeroplane (AMOC paragraph; terminating action)."],"plain_english_summary":"This directive requires operators of certain Boeing 747 aeroplanes to carry out periodic inspections and functional tests of thrust reverser control and indication systems and to fix any discrepancies using specified Boeing service bulletins. An FAA Alternative Means of Compliance (AMOC) is allowed for aeroplanes with Boeing SB 747-78-2151 Rev 2 implemented in production or retrofit. The rule sets different documentary instructions by engine type (Rolls‑Royce RB211‑524G/H and Pratt & Whitney PW4000) and identifies a terminating action for Requirement 3 (AD/B747/230 Amdt 1)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-277-amdt-2-thrust-reverser-inspections-and-tests","history":"/api/acts/ad-b747-277-amdt-2-thrust-reverser-inspections-and-tests/history","analysis":"/api/acts/ad-b747-277-amdt-2-thrust-reverser-inspections-and-tests/analysis","conflicts":"/api/acts/ad-b747-277-amdt-2-thrust-reverser-inspections-and-tests/conflicts","importantCases":"/api/acts/ad-b747-277-amdt-2-thrust-reverser-inspections-and-tests/important-cases","documents":"/api/acts/ad-b747-277-amdt-2-thrust-reverser-inspections-and-tests/documents"}}