{"id":"F2009L03337","name":"AD/B747/388 Amdt 1 - Outboard Flap Track and Transmission Attachment","slug":"ad-b747-388-amdt-1-outboard-flap-track-and-transmission-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":140888,"registerId":"commonwealth-F2009L03337-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 747 Series Aeroplanes","sectionType":"division","heading":"Boeing 747 Series Aeroplanes","content":"### Boeing 747 Series Aeroplanes\n\n| AD/B747/388 Amdt 1 | Outboard Flap Track and Transmission Attachment | 11/2009 DM |\n| ------------------ | ----------------------------------------------- | ---------- |\n\n| Applicability: | Model 747-100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, -400D, -400F, and 747SR series aircraft; as identified in Boeing Service Bulletins 747-27A2398 Revision 1, and 747-27A2421 Revision 1, or later FAA approved revisions.                                                                                                                                                                                                                                                                                        |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2008-23-10 Amdt 39-15731.Boeing Alert Service Bulletin 747-27A2398 is approved by the FAA as an AMOC to the requirements of paragraphs (a) and (b) of FAA AD 2001-03-10 (AD/B747/242) for the number 1, 2, 7 and 8 trailing edge flap positions.                                                                                                                                                                                                                  |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of15 January 2009.The compliance time remains unchanged by this issue of the Directive.                                                                                                                                                                                                                                                                                                                                                                  |\n|                | This Amendment becomes effective on 2 September 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| Background:    | The FAA issued AD 2008-23-10 as a result from a joint Boeing and FAA multi-model study (following in-service trailing edge flap structure and drive system events) on the hazards posed by skewing and failed flaps. This Directive requires modification of the outboard flap track and transmission attachments.Amendment 1 is issued to include a new paragraph to the Requirement section of this Directive, which introduces alternate means of compliance information affecting the outboard trailing edge flap positions. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n26 August 2009","sortOrder":0},{"sectionNumber":"AD/B747/388 Amdt 1","sectionType":"part","heading":"AD/B747/388 Amdt 1","content":"## AD/B747/388 Amdt 1","sortOrder":1},{"sectionNumber":"Outboard Flap Track and Transmission Att","sectionType":"part","heading":"Outboard Flap Track and Transmission Attachment","content":"## Outboard Flap Track and Transmission Attachment","sortOrder":2},{"sectionNumber":"11/2009 DM","sectionType":"part","heading":"11/2009 DM","content":"## 11/2009 DM","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"Amendment 1 adds a new paragraph to the Requirement that introduces alternate means of compliance information affecting the outboard trailing-edge flap positions; it therefore expands the directive by formally recognising Boeing Alert Service Bulletin 747-27A2398 as an approved AMOC for specified flap positions (Requirement/Background)."},"complexity_factors":["Cross-reference to an external FAA AD (FAA AD 2008-23-10) — compliance depends on following an external regulatory instrument (Requirement).","Use of a manufacturer Service Bulletin as an Approved Means of Compliance (Boeing Alert Service Bulletin 747-27A2398 approved as AMOC) — introduces alternate compliance paths and technical specifications (Requirement).","Applicability across many 747 variants (Model 747-100 through 747SR series) — broad fleet coverage increases operational impact and coordination (Applicability).","Technical remedy scope (modification of outboard flap track and transmission attachments) — work is engineering/maintenance intensive and may vary by airframe condition (Background/Requirement).","Multiple administrative dates (revised effective date 15 January 2009; amendment effective 2 September 2009) — administrative layering can affect implementation timing (Compliance).","Compliance time unchanged from earlier directive — operators must reconcile this amendment with existing compliance schedules (Compliance).","Regulatory layering (CASA adopting an FAA AD and recognising Boeing AMOC) — creates inter-jurisdictional dependence and requires operators to track documents from multiple sources (Background/Requirement)."],"plain_english_summary":"**What it does:** This amendment requires operators of specified Boeing 747 models to modify outboard flap tracks and transmission attachments by complying with FAA Airworthiness Directive 2008-23-10.\n\n**Who it affects and why it matters:** Aircraft operators, owners and maintenance organisations must carry out the work within the stated compliance times and meet associated costs; CASA issued the amendment and accepts Boeing Alert Service Bulletin 747-27A2398 as an approved alternate means of compliance for certain trailing-edge flap positions."},"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":3,"scope_assessment":{"changed":false,"description":"This amendment remains tightly scoped to its original purpose. Amendment 1 simply adds alternate means of compliance (AMOC) information for specific flap positions without expanding the directive's coverage to new aircraft systems or extending compliance timelines."},"complexity_factors":["Short, single-purpose directive (approximately 300 words)","Only 4 defined/model references (specific Boeing 747 variants and service bulletins)","Heavy reliance on external documents (FAA AD 2008-23-10 and Boeing Service Bulletins) rather than spelling out technical requirements in the text itself","Simple amendment structure — adds one new paragraph for alternate compliance methods","No nested exceptions or conditional logic within the directive text itself"],"plain_english_summary":"This AD orders inspections and mandatory modifications to the outboard flap track and transmission attachments on specified Boeing 747 models after FAA and Boeing found flap skewing and failures. It affects owners/operators of the listed 747 series and requires complying with FAA AD 2008‑23‑10 and Boeing service guidance to prevent flap failure that could compromise control during approach and landing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-388-amdt-1-outboard-flap-track-and-transmission-attachment","history":"/api/acts/ad-b747-388-amdt-1-outboard-flap-track-and-transmission-attachment/history","analysis":"/api/acts/ad-b747-388-amdt-1-outboard-flap-track-and-transmission-attachment/analysis","conflicts":"/api/acts/ad-b747-388-amdt-1-outboard-flap-track-and-transmission-attachment/conflicts","importantCases":"/api/acts/ad-b747-388-amdt-1-outboard-flap-track-and-transmission-attachment/important-cases","documents":"/api/acts/ad-b747-388-amdt-1-outboard-flap-track-and-transmission-attachment/documents"}}