{"id":"F2006B03021","name":"AD/B747/120 Amdt 1 - Lower Lobe Cargo Doors and Main Deck Side Cargo Door","slug":"ad-b747-120-amdt-1-lower-lobe-cargo-doors-and-main-deck-side-cargo-door","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42380,"registerId":"commonwealth-F2006B03021-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/120 Amdt 1 - Lower Lobe Cargo Doors and Main Deck Side Cargo Door","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/B747/120\n\nAmdt 1\n\n  \n\nLower Lobe Cargo Doors and Main Deck Side Cargo Door\n\n  \n8/93\n\nDM\n\nApplicability: Model 747 series; as listed in Boeing SB 747-52-2186, Revision 4, and Boeing ASB 747-52A2233.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 93-10-01 Amendment 39-8580.\n\nCompliance: As specified in the requirement document.\n\nThe compliance of the initial issue of this Directive remains unchanged. This Amendment is effective from 10 June 1993.\n\nBackground: The FAA has received numerous reports of corroded or cracked fittings, cam latch bellcranks, and cam latches.\n\nAmendment 1 is issued in response to a final rule correction of FAA AD 93-06-03 which clarifies the compliance time for accomplishing optional repetitive inspections of the cam latches.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of addressing cargo door structural integrity. The amendment merely clarifies compliance timing for optional repetitive inspections without expanding the substantive safety requirements or affected aircraft population."},"complexity_factors":["Short, single-purpose directive (approximately 150 words)","Only 2 defined applicability references (Boeing SB and ASB numbers)","Single requirement cross-referencing external FAA document rather than reproducing technical details","No nested conditional logic or exceptions within the text itself","Amendment structure is straightforward — clarifies one specific compliance timing issue"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific Boeing 747 aircraft.\n\n**What it does:**\n- Requires owners and operators of certain Boeing 747 series planes to inspect and fix problems with **cargo doors** — specifically the lower lobe (underfloor) cargo doors and the main deck side cargo door.\n- The directive mandates compliance with a US Federal Aviation Administration (FAA) safety order (AD 93-10-01) that addresses corrosion and cracking in door fittings, cam latch bellcranks, and cam latches.\n\n**Who it affects:**\n- Operators of Boeing 747 aircraft models listed in Boeing Service Bulletin 747-52-2186 Rev 4 and Boeing Alert Service Bulletin 747-52A2233.\n\n**Why it matters:**\n- The FAA received multiple reports of **corroded or cracked components** in cargo door mechanisms. These defects could potentially lead to door failures in flight — a serious safety risk for cargo and potentially cabin pressure integrity.\n- This amendment (Amendment 1) clarifies the timeline for optional repetitive inspections of cam latches, correcting an earlier FAA rule.\n\n**Key point:** Aircraft must comply with the inspection and repair requirements according to the schedule in the referenced FAA document. The original compliance requirements from the first version of this directive remain unchanged."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The Amendment clarifies the compliance time for optional repetitive inspections of the cam latches but does not change the directive's applicability or the core mandatory requirements adopted from the FAA AD. The text states that the compliance of the initial issue remains unchanged and that Amendment 1 addresses a timing clarification (Amendment text; Background)."},"complexity_factors":["Adoption by reference of an external FAA airworthiness directive (FAA AD 93-10-01 Amendment 39-8580) rather than containing full technical text, requiring operators to consult another jurisdictional document (Requirement).","Cross-reference to Boeing service bulletin and alert service bulletin lists to determine exact affected models (Applicability).","Technical nature of the required inspections and possible repairs (corroded/cracked fittings, cam latch bellcranks, cam latches) requires qualified maintenance personnel (Background).","Clarification of timing for optional repetitive inspections introduces conditional compliance paths (optional vs mandatory), adding procedural nuance (Background).","Operational impacts (aircraft downtime, parts and labour) and administrative burden of document control and tracking compliance intervals (Compliance)."],"plain_english_summary":"This instrument directs operators and maintenance organisations of specified Boeing 747 models to comply with FAA AD 93-10-01 (as adopted by CASA) — carrying out required inspections and repairs for corroded/cracked lower-lobe and main deck cargo‑door fittings, cam latch bellcranks and cam latches. Amendment 1 doesn’t change obligations or applicability; it only clarifies the compliance timing for optional repetitive cam‑latch inspections. Operators bear compliance costs; CASA enforces the requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-120-amdt-1-lower-lobe-cargo-doors-and-main-deck-side-cargo-door","history":"/api/acts/ad-b747-120-amdt-1-lower-lobe-cargo-doors-and-main-deck-side-cargo-door/history","analysis":"/api/acts/ad-b747-120-amdt-1-lower-lobe-cargo-doors-and-main-deck-side-cargo-door/analysis","conflicts":"/api/acts/ad-b747-120-amdt-1-lower-lobe-cargo-doors-and-main-deck-side-cargo-door/conflicts","importantCases":"/api/acts/ad-b747-120-amdt-1-lower-lobe-cargo-doors-and-main-deck-side-cargo-door/important-cases","documents":"/api/acts/ad-b747-120-amdt-1-lower-lobe-cargo-doors-and-main-deck-side-cargo-door/documents"}}