{"id":"F2006B03072","name":"AD/B747/17 Amdt 2 - Inboard Engine Strut-To-Diagonal Brace Attach Fitting","slug":"ad-b747-17-amdt-2-inboard-engine-strut-to-diagonal-brace-attach-fitting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42431,"registerId":"commonwealth-F2006B03072-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/17 Amdt 2 - Inboard Engine Strut-To-Diagonal Brace Attach Fitting","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/B747/17\n\nAmdt 2\n\n  \n\nInboard Engine Strut-To-Diagonal Brace Attach Fitting\n\n  \n1/96\n\nApplicability: Model 747 series aircraft as listed in Boeing Service Bulletin (SB) 747-54-2062 Rev.\n\n7.\n\nRequirement: Inspect the inboard strut-to-diagonal brace fittings for cracking in accordance with FAA AD 95-20-05 Amdt 39-9383.\n\nNote: Boeing SB 747-54-2062 Rev. 7 refers.\n\nCompliance: As specified in the Requirement Document with a revised effective date of 4 January 1996.\n\nBackground: A number of operators reported cracked fittings found in service. Amendment 1 reflected the revision status of SB 54-2062 which allowed terminating action including installation of a cover plate to seal a gap in the web. Amendment 2 is issued in response to reports of cracking and severing of the attach fittings. This amendment expands the applicability and requires an additional inspection.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The AD’s scope was expanded by Amendment 2: it broadens the applicability (more aircraft covered as per the Boeing SB) and requires an additional inspection in response to further reports of cracking and severing of attach fittings. Amendment 1 had previously recognised a Boeing SB revision that provided a terminating modification (cover plate). (See: Background — Amendment 1; Background — Amendment 2; Applicability.)"},"complexity_factors":["Reliance on external technical documents (FAA AD 95-20-05 and Boeing SB 747-54-2062 Rev. 7) to specify inspection procedures and intervals (Requirement; Note).","Amendment history: multiple amendments including introduction of a terminating action in Amendment 1 and an expanded applicability plus additional inspection in Amendment 2 (Background).","Operational and compliance implications are delegated to referenced documents rather than fully specified in the AD text (Requirement; Compliance).","Targeted scope limited to specific Model 747s listed in the Boeing service bulletin, requiring operators to check applicability against that list (Applicability)."],"plain_english_summary":"This AD requires operators of specified Boeing 747s to inspect inboard engine strut-to-diagonal brace attach fittings for cracking per the referenced FAA AD and Boeing service bulletin. Amendment 2 expands which aircraft are covered and adds a further inspection after reports of cracking and severing. Operators bear inspection and modification costs; installing the SB’s cover-plate can terminate recurring inspections. The AD adopts FAA/Boeing technical procedures and timing rather than restating them."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"The original directive (Amendment 1) allowed 'terminating action' — a repair that could end the need for repeated inspections. Amendment 2 expands beyond this by: (1) widening which aircraft must comply, and (2) adding an additional mandatory inspection even where terminating action was previously taken. The scope shifted from a one-time fix option to ongoing enhanced surveillance due to new reports of complete fitting failure ('severing')."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term (Applicability references a specific Boeing Service Bulletin)","No nested conditional logic or cross-references to other legislation","Single straightforward requirement: inspect for cracks per existing FAA directive","Linear structure: Applicability → Requirement → Compliance → Background with no exceptions or sub-clauses"],"plain_english_summary":"This is a **safety directive for Boeing 747 aircraft** that requires airlines to inspect a specific part of the plane's engine mounting structure.\n\n**What it does:**\n- Orders inspections of the **inboard engine strut-to-diagonal brace attach fitting** — a metal bracket that helps hold the engine to the wing\n- Requires checking this part for **cracks** that could lead to structural failure\n- Expands which aircraft must be checked (more models than before) and adds an extra inspection step\n\n**Who it affects:**\n- Airlines and operators flying Boeing 747 series aircraft covered by Boeing Service Bulletin 747-54-2062 Revision 7\n- Maintenance crews responsible for keeping these planes airworthy\n\n**Why it matters:**\n- **Safety critical:** Cracked or severed fittings could cause engine separation or structural damage in flight\n- **Based on real incidents:** Operators found cracked fittings in actual service, and some fittings had completely broken (\"severing\")\n- **Mandatory compliance:** Airlines must follow this directive by the specified date (4 January 1996) to keep their aircraft legally airworthy\n\nThis is an **Airworthiness Directive (AD)** — a legally enforceable order from the Civil Aviation Safety Authority requiring specific maintenance actions when unsafe conditions are discovered in aircraft design or operation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-17-amdt-2-inboard-engine-strut-to-diagonal-brace-attach-fitting","history":"/api/acts/ad-b747-17-amdt-2-inboard-engine-strut-to-diagonal-brace-attach-fitting/history","analysis":"/api/acts/ad-b747-17-amdt-2-inboard-engine-strut-to-diagonal-brace-attach-fitting/analysis","conflicts":"/api/acts/ad-b747-17-amdt-2-inboard-engine-strut-to-diagonal-brace-attach-fitting/conflicts","importantCases":"/api/acts/ad-b747-17-amdt-2-inboard-engine-strut-to-diagonal-brace-attach-fitting/important-cases","documents":"/api/acts/ad-b747-17-amdt-2-inboard-engine-strut-to-diagonal-brace-attach-fitting/documents"}}