{"id":"F2006B03221","name":"AD/B747/40 Amdt 7 - Trailing Edge Flap Tracks","slug":"ad-b747-40-amdt-7-trailing-edge-flap-tracks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42593,"registerId":"commonwealth-F2006B03221-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/40 Amdt 7 - Trailing Edge Flap Tracks","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBoeing 747 Series Aeroplanes\n\nAD/B747/40\n\nAmdt 7\n\n  \nTrailing Edge Flap Tracks 7/90\n\nApplicability: All models referenced in Boeing SB 57A2229 Rev 9.\n\nRequirement: Action in accordance with the requirements of FAA AD 89-05-04 Rev 1 Amendment 39-6148 as revised by Amendment 39-6484, Paragraphs A to N inclusive.\n\nCompliance: As detailed in the Requirement Document.\n\nBackground: The previous issues of this Directive fulfilled the requirements of FAA AD 84-19-02 all Revisions. That was superseded by the initial issue of FAA AD 88-16-03 which in turn was raised to Revision 1 as a result of FAA AD T88-21-50 (AD/B747/67- subsequently cancelled).\n\nAmendment 5 included all of the Requirements from FAA ADs 88-16-03 Rev 1 and T88-21-51. It also increased the number of fail-safe bar fastener holes to be inspected. Amendment 6 referenced Revision 8 of the Requirement document.\n\nAmendment 7 references Revision 9 of the Requirement document and, as there are no longer discrete Australian technical requirements, calls up the technical requirements of the FAA AD in toto.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"The legislation has narrowed in scope from its original form. Earlier amendments included discrete Australian technical requirements and specific modifications to FAA directives (such as increasing the number of fastener holes to be inspected in Amendment 5). Amendment 7 represents a deliberate simplification — removing Australian-specific technical requirements entirely and adopting the FAA AD 'in toto' (in full). This is a scope reduction toward regulatory harmonisation rather than expansion."},"complexity_factors":["Multiple nested references to external documents (FAA AD 89-05-04 Rev 1, Amendment 39-6148, Amendment 39-6484, Boeing SB 57A2229 Rev 9)","Historical chain of superseded directives (AD 84-19-02, AD 88-16-03, T88-21-50, T88-21-51) requiring background knowledge to understand evolution","Cross-referencing between Australian and US regulatory systems (CASA adopting FAA requirements)","Technical aviation terminology (fail-safe bar fastener holes, trailing edge flap tracks, service bulletins) requiring domain expertise","Amendment history tracking (Amendments 5, 6, and 7) with incremental changes to inspection scope and reference documents"],"plain_english_summary":"This AD mandates inspections and repairs of Boeing 747 trailing-edge flap tracks by requiring operators to follow the FAA’s AD 89-05-04 Rev 1 (as amended). It applies to all 747s covered by Boeing Service Bulletin 57A2229 Rev 9, including Australian and foreign carriers operating in Australian airspace.  \n\nThe change harmonises Australian rules with the FAA’s directive—reducing duplication—while addressing a safety-critical failure mode that could affect control during takeoff or landing."},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"Amendment 7 moved from discrete Australian technical requirements to adopting the FAA AD text wholesale (Background and final paragraph). That shifts technical authority and document reliance to the FAA AD and Boeing SB Rev 9; operators must now follow the FAA paragraph structure (A–N) rather than separate Australian prescriptions."},"complexity_factors":["Incorporation by reference of an external FAA AD (Requirement: \"Paragraphs A to N inclusive\") — requires cross-jurisdictional reading and reliance on non-Australian regulatory text.","Specific applicability tied to Boeing SB 57A2229 Rev 9 (Applicability), so compliance requires consulting the correct service bulletin revision.","Multiple historical amendments and supersessions noted in Background, which complicates tracking which technical requirement applies.","Technical actions (inspections/repairs) are defined in an external, detailed FAA document rather than in the Australian instrument — increases operational and documentation burden on operators and maintainers.","Compliance requires trained maintenance personnel and record-keeping to demonstrate adherence to FAA paragraphs A–N — administrative and labour costs for operators.","Potential for future FAA revisions to affect Australian compliance if relied upon in toto (Amendment 7: \"calls up the technical requirements of the FAA AD in toto\")."],"plain_english_summary":"Amendment 7 requires operators of the Boeing 747 models listed in Boeing Service Bulletin 57A2229 Rev 9 to perform inspections and any corrective work for trailing-edge flap tracks exactly as specified in the referenced FAA airworthiness directive (FAA AD 89-05-04 Rev 1 as revised). It replaces discrete Australian technical instructions with the FAA AD text; affected operators bear the inspection/repair costs, must schedule compliance per the FAA paragraphs A–N, and rely on FAA/Boeing documents for technical detail."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-40-amdt-7-trailing-edge-flap-tracks","history":"/api/acts/ad-b747-40-amdt-7-trailing-edge-flap-tracks/history","analysis":"/api/acts/ad-b747-40-amdt-7-trailing-edge-flap-tracks/analysis","conflicts":"/api/acts/ad-b747-40-amdt-7-trailing-edge-flap-tracks/conflicts","importantCases":"/api/acts/ad-b747-40-amdt-7-trailing-edge-flap-tracks/important-cases","documents":"/api/acts/ad-b747-40-amdt-7-trailing-edge-flap-tracks/documents"}}