{"id":"F2009L03338","name":"AD/B747/242 Amdt 1 - Trailing Edge Flap H-11 Bolts","slug":"ad-b747-242-amdt-1-trailing-edge-flap-h-11-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":140891,"registerId":"commonwealth-F2009L03338-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/B747/242 Amdt 1 | Trailing Edge Flap H-11 Bolts | 11/2009 DM |\n| ------------------ | ----------------------------- | ---------- |\n\n| Applicability: | All Model 747-100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, -400D,-400F, and 747SR series aircraft.                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2001-03-10 Amdt 39-12114.Boeing Alert Service Bulletin (ASB) 747-27A2398 is approved by the FAA as an AMOC to the requirements of paragraphs (a) and (b) of FAA AD 2001-03-10 for the number 1, 2, 7 and 8 trailing edge flap positions. Boeing ASB 747-27A2398 is related to AD/B747/388.Note: Boeing Service Bulletin 747-27A2376 original issue, or later FAA approved revision, refers.                                                                                                               |\n| Compliance:    | As specified in the Requirement document with a revised effective date of17 May 2001.The compliance time remains unchanged by this issue of the Directive.                                                                                                                                                                                                                                                                                                                                                                                                               |\n|                | This Amendment becomes effective on 2 September 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |\n| Background:    | The FAA requires an inspection to determine whether H-11 steel bolts are installed as attach and support bolts at the trailing edge flap transmissions, and replacement of any H-11 steel bolt with an Inconel bolt. The required actions are intended to prevent loss of a flap transmission, which could reduce lateral controllability of the aircraft.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/B747/242 Amdt 1","sectionType":"part","heading":"AD/B747/242 Amdt 1","content":"## AD/B747/242 Amdt 1","sortOrder":1},{"sectionNumber":"Trailing Edge Flap H-11 Bolts","sectionType":"part","heading":"Trailing Edge Flap H-11 Bolts","content":"## Trailing Edge Flap H-11 Bolts","sortOrder":2},{"sectionNumber":"11/2009 DM","sectionType":"part","heading":"11/2009 DM","content":"## 11/2009 DM","sortOrder":3}],"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":4,"scope_assessment":{"changed":true,"description":"The Amendment does not expand the population of affected aircraft but changes permitted compliance methods: it adds a new paragraph to the Requirement introducing FAA‑approved alternate means of compliance (Boeing ASB 747-27A2398) for outboard trailing edge flap positions (1, 2, 7 and 8). Mechanically, the core mandate (inspect and replace H‑11 bolts with Inconel) remains, while the allowed procedures and approvals for meeting that mandate are broadened (Requirement; Background)."},"complexity_factors":["Wide applicability across many Boeing 747 variants increases operator coordination and record-checking (Applicability).","Requirement cross-references FAA AD 2001-03-10 and specific Boeing Alert Service Bulletins (ASB 747-27A2398; note to 747-27A2376), creating layered document reliance (Requirement).","Amendment introduces alternate means of compliance (AMOC) for specific outboard flap positions (1, 2, 7, 8), adding procedural choice and approval steps (Requirement; Background).","Safety-critical technical action: inspection for H-11 bolts and mandatory replacement with Inconel bolts imposes tangible maintenance work, parts procurement and downtime costs on operators (Background; Requirement).","Two different effective dates are referenced (revised effective date 17 May 2001 for the Requirement document, amendment effective 2 September 2009), which can cause scheduling and compliance-record ambiguity (Compliance).","Multiple authorities involved (CASA issuing the Directive, FAA AD as normative requirement, Boeing ASBs as acceptable AMOC) increases administrative interaction and potential for differing interpretations (Requirement; Background)."],"plain_english_summary":"This Directive requires operators of all listed Boeing 747-100/200/300/400/SR series aeroplanes to inspect trailing edge flap transmissions for H‑11 steel bolts and replace any found with Inconel bolts, using FAA AD 2001-03-10 and Boeing service bulletins as the compliance path. The CASA amendment adds FAA‑approved alternate means of compliance for the outboard flap positions (1, 2, 7 and 8). Aircraft operators pay for inspections and replacements; CASA/FAA/Boeing determine acceptable compliance methods and timing."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment remains tightly scoped to its original purpose of addressing H-11 bolt safety in 747 trailing edge flaps. The amendment adds an alternative means of compliance for specific flap positions but does not expand the aircraft types covered, the safety issue addressed, or the fundamental inspection/replacement requirement. The scope has remained stable since the original 2001 directive."},"complexity_factors":["Short, single-purpose directive (approximately 300 words)","Only 3 defined technical references (FAA AD 2001-03-10, Boeing ASB 747-27A2398, Boeing SB 747-27A2376)","Simple conditional structure: inspect → if H-11 found → replace","One cross-reference to related Australian directive AD/B747/388","Minimal legal drafting - primarily technical aviation terminology rather than legislative complexity","Single amendment adding one alternative compliance pathway"],"plain_english_summary":"This Airworthiness Directive orders inspections and corrective action on Boeing 747 series aircraft in Australia to ensure H-11 steel bolts used on trailing edge flaps are identified and replaced with stronger Inconel bolts, with an approved alternative repair allowed for the outermost flap positions.  \n\nIt affects all Australian operators of 747-100/200/300/400/747SR types and matters because H-11 bolt failure can detach a flap transmission, degrading lateral controllability during critical flight phases."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-242-amdt-1-trailing-edge-flap-h-11-bolts","history":"/api/acts/ad-b747-242-amdt-1-trailing-edge-flap-h-11-bolts/history","analysis":"/api/acts/ad-b747-242-amdt-1-trailing-edge-flap-h-11-bolts/analysis","conflicts":"/api/acts/ad-b747-242-amdt-1-trailing-edge-flap-h-11-bolts/conflicts","importantCases":"/api/acts/ad-b747-242-amdt-1-trailing-edge-flap-h-11-bolts/important-cases","documents":"/api/acts/ad-b747-242-amdt-1-trailing-edge-flap-h-11-bolts/documents"}}