{"id":"F2006B03114","name":"AD/B747/214 Amdt 3 - Thrust Reverser Checks","slug":"ad-b747-214-amdt-3-thrust-reverser-checks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42486,"registerId":"commonwealth-F2006B03114-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/214 Amdt 3 - Thrust Reverser Checks","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\n \n\n \n\n![](image.001.png)\n\n![](image.001.png)  AIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B747/214 Amdt 2 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\n![](image.001.png)\n\n \n\nBoeing 747 Series Aeroplanes\n\n \n\nAD/B747/214\n\nAmdt 3\n\n\nThrust Reverser Checks 7/2002\n\n \n\nApplicability: Model 747-100B, -200, -300 and 747SP series aeroplanes, equipped with Rolls Royce RB211-524B2, C2 and D4 engines as listed in the following Service Bulletins:\n\nBoeing Alert Service Bulletin 747-78A2148 dated 1 June 1995; and Boeing Service Bulletin 747-78A2148, Revision 1 dated 20 July 1995; and Boeing Service Bulletin 747-78-2136 dated 11 May 1995; and\n\nBoeing Service Bulletin 747-78-2156 dated 31 October 1996.\n\n \n\nBoeing Service Bulletin 747-78-2156 Revision 1 dated 30 August 2001.\n\n \n\nRequirement: Unless already modified in accordance with Requirement 4, carry out all of the following requirements. Aeroplanes modified in accordance with Requirement 4 remain subject to the requirements and repeat inspections specified in Requirements 5, 6 & 7.\n\n \n\n1. Carryout and successfully accomplish the applicable inspections and tests of the thrust reverser control and indication system on each engine in accordance with Part III.A through III.G of the Accomplishment Instructions of Boeing Alert Service Bulletin 747-78A2148, or Boeing Service Bulletin 747-78A2148 Revision 1.\n\n\n \n\n2.        Repeat and successfully accomplish the inspections and tests of Requirement 1.\n\n \n\n3.        (a) If tests and inspections of Requirement 1 or 2 cannot be successfully carried out as specified in the referenced service bulletin, or if any discrepancy is detected during any inspection or test, repair the thrust reverser in accordance with Boeing Alert SB 747-78A2148 or Boeing SB747-78A2148 Revision 1.\n\n(b)     Any failed Requirement 1 or 2 inspection or test must be repeated and successfully accomplished.\n\n \n\n4.        Install an additional locking system on the thrust reversers in accordance with the Accomplishment Instructions in Boeing Service Bulletin 747-78-2156 initial revision or Revision 1. Prior to or concurrent with accomplishment of Boeing Service Bulletin 747-78-2156, accomplish Boeing Service Bulletin 747-78-2136, and Rolls Royce Service Bulletins RB211-71-B545, Revision 2, RB211-71- B551, Revision 1 and RB211-78-B552.\n\n \n\n5.        Carryout and successfully accomplish operational checks of the number 2 and number 3 gearbox locks and the air motor brake in accordance with the procedures described in Appendix 1 to FAA AD 2000-01-05 Amendment 39- 11502.\n\n6.        Repeat and successfully accomplish operational checks of Requirement 5.\n\n \n\n7.        (a) If any of the operational checks required by Requirement 5 or 6 cannot be successfully carried out as specified in Appendix 1 to FAA AD 2000-01-05, or any discrepancy is detected during any operational check, repair the thrust reverser in accordance with the procedures specified in the Boeing 747 airplane maintenance manual.\n\n \n\n(b)     Any failed Requirement 5 or 6 operational check must be repeated and successfully accomplished.\n\n \n\n# Terminating Action\n\n \n\nAccomplishment of Requirement 4 satisfies the inspections and test requirements in Requirements 1 & 2.\n\n \n\nNote: FAA AD 2000-01-05 Amendment 39-11502 refers which supersedes FAA AD 99-18-03 amendment 39-11269 (the FAA AD that caused the original AD/B747/214 to be raised).\n\n \n\nCompliance: For Requirement 1: Unless previously accomplished, within 90 days from 4 October\n\n2001.\n\n \n\nFor Requirement 2: At intervals not to exceed 18 months time in service until requirement 4 is accomplished.\n\nFor Requirement 3: (a)  Prior to further flight.\n\n(b) Prior to further flight.\n\nFor Requirement 4: Within 36 months from 4 October 2001.\n\nFor Requirement 5: Within 3000 flight hours after accomplishment of requirement 4 or 1000 flight hours after 4 October 2001, whichever occurs later.\n\n \n\nFor Requirement 6: At intervals not to exceed 3000 flight hours. For Requirement 7: (a)              Prior to further flight.\n\n(b) Prior to further flight.\n\n \n\nThis Amendment becomes effective on 11 July 2002.\n\n \n\nBackground: The original and Amendment 1 issue of this Directive was raised to ensure the integrity of the fail safe features of the thrust reverser system were maintained by preventing possible failure modes which could result in inadvertent deployment of a thrust reverser during flight. Amendment 2 was issued to reflect the latest issue of Boeing SB 747-78-2156 but did not add aircraft or require more work on aircraft changed in accordance with the original issue of the service bulletin. This amendment has been issued to include minor editorial changes and to transfer Note 1 into a positive terminating action paragraph.\n\n \n\nThe original issue of this Airworthiness Directive became effective on 2 December 1999.\n\nAmendment 1 of this Airworthiness Directive became effective on 13 July 2000. Amendment 2 of this Airworthiness Directive became effective on 4 Oct 2000.\n\n![Signature of James Coyne, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\n\n \n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 30 May 2002\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n![](image.001.png)  \n\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 19 June 2002.\n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":false,"description":"Amendment 3 performs minor editorial changes and converts a note into an explicit terminating‑action paragraph; it does not add aircraft or require additional work beyond earlier issues. Earlier amendments similarly updated referenced service bulletins but did not expand applicability or increase mandated work (Background). Therefore the substantive scope—inspections, repairs, and the terminating locking‑system installation—remains unchanged."},"complexity_factors":["Multiple, cross‑referenced service bulletins: Boeing Alert SB 747‑78A2148 (and Revision 1), SB 747‑78‑2136, SB 747‑78‑2156 (and Revision 1), plus Rolls Royce SBs RB211‑71‑B545 Rev 2, RB211‑71‑B551 Rev 1 and RB211‑78‑B552 (Applicability & Requirement 4).","Several distinct mandatory actions (Requirements 1–7): initial inspections/tests, repeat intervals, operational checks, repair procedures, and a terminating modification (Requirement 4).","Different compliance deadlines and interval metrics: 90 days, 18 months, 36 months, and flight‑hour triggers (e.g. 3000 or 1000 flight hours) (Compliance section).","Terminating action interplay: installing the additional locking system (Req 4) stops the need for some recurring inspections (Terminating Action paragraph), so operators must plan sequencing correctly.","Repairs and failed checks require following different technical sources: the Boeing Alert/SB procedures or the Boeing 747 maintenance manual (Req 3(a), 7(a)).","External regulatory cross‑reference to FAA AD 2000‑01‑05 and its Appendix 1 for operational check procedures (Requirements 5 & App1), adding an interjurisdictional compliance dimension.","Applicability is engine‑ and bulletin‑specific, so fleet managers must match SB applicability to individual airframes/engines before compliance (Applicability).","Regulatory provenance: issued under CASA subregulation 39.1(1) by the CASA delegate, so compliance is mandatory and supervised by CASA (preamble)."],"plain_english_summary":"This Airworthiness Directive requires operators of certain Boeing 747-100/200/300 and 747SP aeroplanes with Rolls‑Royce RB211‑524B engines to perform specified inspections and tests of thrust‑reverser controls, repair any defects, and—within a set period—install an additional locking system. The stated purpose is to preserve fail‑safe features and prevent inadvertent in‑flight thrust‑reverser deployment; operators pay for the inspections, repairs and modification work."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":6,"scope_assessment":{"changed":false,"description":"This Amendment 3 remains tightly scoped to its original purpose. The Background section explicitly states this amendment only makes 'minor editorial changes' and converts a note into a formal terminating action paragraph. It does not add new aircraft, expand applicability, or impose additional substantive requirements beyond what was already contemplated in the original AD and Amendment 2. The scope has remained consistent: ensuring thrust reverser system integrity on the specified Boeing 747 models."},"complexity_factors":["Multiple interdependent requirements (7 numbered requirements with cross-dependencies — e.g., Requirement 4 terminates Requirements 1-2 but triggers Requirements 5-7)","Dual compliance pathways: aircraft either follow the 'inspect until modified' path or the 'post-modification monitoring' path","Extensive external referencing: mandates compliance with 6 different Boeing Service Bulletins and 3 Rolls Royce Service Bulletins, plus an FAA AD (foreign regulator's directive)","Layered conditional logic: 'Unless already modified', 'if any discrepancy is detected', 'prior to further flight' conditions creating nested decision trees","Multiple compliance timeframes calculated from different baseline dates (4 October 2001 vs. accomplishment of Requirement 4 vs. 'whichever occurs later' calculations)","Technical aviation terminology requiring specialized knowledge (thrust reversers, air motor brakes, gearbox locks, service bulletins)","Amendment structure creates historical layering: references to previous amendments (1, 2) and original issue, requiring understanding of what changed vs. what remained"],"plain_english_summary":"This CASA Airworthiness Directive requires inspections, tests and a permanent additional locking modification to the thrust reverser systems on certain Boeing 747s with Rolls‑Royce RB211 engines. Operators must perform near‑term and recurring checks until the hardware fix is installed (within three years), then continue periodic operational monitoring to prevent accidental in‑flight thrust reverser deployment and potential loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-214-amdt-3-thrust-reverser-checks","history":"/api/acts/ad-b747-214-amdt-3-thrust-reverser-checks/history","analysis":"/api/acts/ad-b747-214-amdt-3-thrust-reverser-checks/analysis","conflicts":"/api/acts/ad-b747-214-amdt-3-thrust-reverser-checks/conflicts","importantCases":"/api/acts/ad-b747-214-amdt-3-thrust-reverser-checks/important-cases","documents":"/api/acts/ad-b747-214-amdt-3-thrust-reverser-checks/documents"}}