{"id":"F2006B03256","name":"AD/B747/79 Amdt 2 - Structural Modification/Inspection Program","slug":"ad-b747-79-amdt-2-structural-modification-inspection-program","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42680,"registerId":"commonwealth-F2006B03256-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/79 Amdt 2 - Structural Modification/Inspection Program","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/B747/79\n\nAmdt 2\n\n  \nStructural Modification/Inspection Program 10/95\n\nApplicability: Boeing B747 series aircraft listed in Boeing Document D6-35999 Revision E, Sections 3 and 4 and Appendices A, B, C and D.\n\nRequirement: 1. Modify in accordance with Boeing Document D6-35999 Revision E, Section 3 and Appendices A, B and D.\n\n2. Inspect in accordance with Boeing Document D6-35999 Revision E, Section 4 and Appendices B and C.\n\nNote 1: FAA AD 90-06-06 refers to the original issue of Boeing Document D6-35999 and mandates modification requirements. FAA AD 92-27-04 refers to D6-35999 Revision C and mandates the inspection requirements of Section 4.\n\nNote 2: The modifications of Requirement 1 do not terminate the inspection requirements of any other AD unless that AD specifies that such modification cancels those inspection requirements.\n\nCompliance: In accordance with Boeing Document D6-35999 Revision E, with a revised effective date of 14 September 1995 for the changes introduced by this Amendment.\n\nBackground: The FAA sponsored Airworthiness Assurance Working Group was tasked with identifying and implementing procedures to ensure the continuing airworthiness of high time aircraft. This AD requires modifications and inspections in lieu of those inspections which are not considered to be fully effective.\n\nThis Amendment references Boeing Document D6-35999 Revision E.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"This Amendment updates the AD to reference Boeing Document D6-35999 Revision E and sets a revised effective date (14 September 1995) for the changes introduced. Mechanically, it replaces prior document/version references and specifies which modification and inspection requirements now apply; it also reiterates that those modifications do not cancel unrelated AD inspection obligations unless explicitly stated (Requirement; Compliance; Note 2)."},"complexity_factors":["External-document dependence: substantive instructions are contained in Boeing Document D6-35999 Revision E (Applicability; Requirement).","Multiple technical actions: both structural modifications (Section 3 and Appendices A, B, D) and recurring inspections (Section 4 and Appendices B, C) are mandated (Requirement).","Cross‑reference to other regulators/ADs: Notes reference FAA ADs and earlier document versions, requiring reconciliation with prior mandates (Note 1).","Interaction with other ADs: the modification requirement explicitly does not terminate inspection requirements of other ADs unless those ADs say so, creating potential compliance tracking burdens (Note 2).","Amendment timing: the instrument updates the effective date for the changes introduced by this Amendment, requiring operators to track revised compliance dates (Compliance).","Applicability limitation: only aircraft listed in the external Boeing document are covered, so operators must verify inclusion against that list (Applicability).","Technical implementation burden: structural modifications and inspections are specialised, likely requiring certified maintenance facilities and recordkeeping (Requirement; Background)."],"plain_english_summary":"This airworthiness directive requires operators of specified Boeing 747 series aircraft to carry out particular structural modifications and ongoing inspections described in Boeing Document D6-35999 Revision E. The Civil Aviation Safety Authority issues the directive and sets the compliance timing (revised effective date 14 September 1995). The stated aim—drawn from an FAA‑sponsored working group—is to ensure continuing airworthiness where existing inspections were judged not fully effective."},"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":4,"scope_assessment":{"changed":false,"description":"This legislation maintains its original scope. It is a technical amendment (Amendment 2) to an existing Airworthiness Directive that updates the referenced Boeing document from earlier revisions to Revision E. The core purpose — mandating structural modifications and inspections for aging Boeing 747 aircraft — remains unchanged from the original AD/B747/79 issued in 1990."},"complexity_factors":["Heavy reliance on external technical documents (Boeing Document D6-35999 Revision E) — the actual requirements are not spelled out in the legislation itself but incorporated by reference","Multiple cross-references to US FAA Airworthiness Directives (90-06-06 and 92-27-04) for context","Conditional logic in Note 2 regarding termination of other AD requirements","Specific applicability criteria requiring reference to Sections 3, 4 and Appendices A-D of the Boeing document","Amendment structure requires understanding of what changed from previous versions (original issue and Revision C referenced)"],"plain_english_summary":"This AD mandates structural modifications and inspections on specified Boeing 747s, to be carried out per Boeing D6-35999 Revision E. It affects operators, airlines and maintenance organisations responsible for those high‑time aircraft. The measures respond to fatigue and inspection shortfalls identified by an FAA working group and aim to keep older 747s airworthy. This is Amendment 2, effective 14 September 1995; compliance doesn’t automatically remove other inspection obligations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-79-amdt-2-structural-modification-inspection-program","history":"/api/acts/ad-b747-79-amdt-2-structural-modification-inspection-program/history","analysis":"/api/acts/ad-b747-79-amdt-2-structural-modification-inspection-program/analysis","conflicts":"/api/acts/ad-b747-79-amdt-2-structural-modification-inspection-program/conflicts","importantCases":"/api/acts/ad-b747-79-amdt-2-structural-modification-inspection-program/important-cases","documents":"/api/acts/ad-b747-79-amdt-2-structural-modification-inspection-program/documents"}}