{"id":"F2006B03122","name":"AD/B747/221 - Lower Lobe and Main Deck Side Cargo Doors Latch Pins","slug":"ad-b747-221-lower-lobe-and-main-deck-side-cargo-doors-latch-pins","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42494,"registerId":"commonwealth-F2006B03122-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.","sortOrder":0},{"sectionNumber":"AD/B747/221 Lower Lobe and Main Deck Sid","sectionType":"part","heading":"AD/B747/221 Lower Lobe and Main Deck Side Cargo Doors Latch Pins","content":"# AD/B747/221 Lower Lobe and Main Deck Side Cargo Doors Latch Pins\n\nApplicability: Model 747 series aircraft, line numbers 1 through 1078.","sortOrder":1},{"sectionNumber":"4/2000","sectionType":"part","heading":"4/2000","content":"# AD/B747/221 Lower Lobe and Main Deck Side Cargo Doors Latch Pins\n\nApplicability: Model 747 series aircraft, line numbers 1 through 1078.\n\n#   \n4/2000","sortOrder":2}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This appears to be a standard, original-issue Airworthiness Directive. ADs are typically narrow in scope by design — they address specific unsafe conditions in specific aircraft types. There is no indication this has expanded beyond its original purpose of addressing latch pin defects on 747 cargo doors."},"complexity_factors":["Short, single-issue directive focused on one specific mechanical component","Limited applicability (only specific Boeing 747 line numbers)","Standard AD structure with clearly separated sections (Applicability, Requirement, Compliance, Background)","No nested exceptions or complex conditional logic","Minimal cross-referencing to other legislation (only cites CAR 1998 subregulation 39.1(1) as enabling power)","Technical content is straightforward (mechanical inspection/replacement of latch pins)","Approximately 4–5 defined elements (aircraft model, line numbers, specific door locations)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) that requires specific repairs or inspections on aircraft.\n\n**What it does:**\nThis directive orders owners and operators of certain Boeing 747 aircraft to take action regarding **latch pins** on the **lower lobe and main deck side cargo doors**. Latch pins are mechanical components that help secure cargo doors during flight. The directive was issued because these parts were found to have an **unsafe condition** that could potentially cause cargo door failure.\n\n**Who it affects:**\n- **Aircraft covered:** All Boeing 747 series aircraft with line numbers 1 through 1,078 (essentially the early production models)\n- **People affected:** Airlines, aircraft operators, and maintenance organisations that own or operate these specific 747s\n\n**Why it matters:**\nCargo door failures can be catastrophic — they can cause rapid decompression, damage to aircraft structure, and potentially lead to loss of control. This directive ensures that a known mechanical defect gets fixed before it causes an accident. Compliance is **legally mandatory** — operators cannot legally fly these aircraft without completing the required action.\n\n**Key sections:**\n- **Applicability:** Defines which aircraft must comply (747s, line numbers 1–1078)\n- **Requirement:** Specifies what action must be taken (the actual repair/inspection instructions)\n- **Compliance:** Sets deadlines for when the work must be completed\n- **Background:** Explains the safety risk that prompted this order"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"No information in the provided text indicates the AD’s scope has changed from an original intent. The excerpt states applicability (Model 747, line numbers 1–1078) and sets the AD framework; no amendment history or prior scope is included to show a change."},"complexity_factors":["Issuing authority and legal hook: reliance on subregulation 39.1(1) of CAR 1998 (governs scope and delegated decision-making).","Wide applicability: covers Model 747 series, line numbers 1–1078 (large fleet scope increases operational impact).","Cross-reference dependence: the AD directs compliance 'in accordance with the instructions set out in the requirement section' and timing in the compliance section, requiring consult of other AD sections or documents not included in the excerpt.","Operational burden rests on operators: the AD structure places responsibility for carrying out corrective action and meeting timing on aircraft operators (imposes compliance costs and downtime risk).","Limited remedial detail in provided text: absence of the specific corrective steps in the excerpt means implementers must obtain the full AD text or referenced service instructions to determine exact actions."],"plain_english_summary":"An Airworthiness Directive from the Civil Aviation Safety Authority requires corrective action on lower-lobe and main-deck side cargo door latch pins for Boeing 747 aircraft (line numbers 1–1078). It is issued under subregulation 39.1(1) of CAR 1998 and obliges operators to carry out the AD’s required actions at the times and in the manner set out in the AD, making operators responsible for compliance and timing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-221-lower-lobe-and-main-deck-side-cargo-doors-latch-pins","history":"/api/acts/ad-b747-221-lower-lobe-and-main-deck-side-cargo-doors-latch-pins/history","analysis":"/api/acts/ad-b747-221-lower-lobe-and-main-deck-side-cargo-doors-latch-pins/analysis","conflicts":"/api/acts/ad-b747-221-lower-lobe-and-main-deck-side-cargo-doors-latch-pins/conflicts","importantCases":"/api/acts/ad-b747-221-lower-lobe-and-main-deck-side-cargo-doors-latch-pins/important-cases","documents":"/api/acts/ad-b747-221-lower-lobe-and-main-deck-side-cargo-doors-latch-pins/documents"}}