{"id":"F2006B03193","name":"AD/B747/300 - Cargo Door Latch Fitting H-11 Steel Bolts","slug":"ad-b747-300-cargo-door-latch-fitting-h-11-steel-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42565,"registerId":"commonwealth-F2006B03193-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.001.png)  \n\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 CASR 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.\n\n![](image.001.png)  \n\nBoeing 747 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/B747/300 Cargo Door Latch Fitting H-1","sectionType":"part","heading":"AD/B747/300 Cargo Door Latch Fitting H-11 Steel Bolts 3/2004","content":"# AD/B747/300 Cargo Door Latch Fitting H-11 Steel Bolts 3/2004\n\nApplicability: Model 747-100, \\-100B, \\-100B SUD, \\-200B, \\-200C, \\-200F, \\-300, \\-400, 747SR, and\n\n747SP series aircraft; line numbers 1 through 721, 976, and 982.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 2003-25-11 Amdt Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.\n\n39-13394.\n\nNote: Boeing Alert Service Bulletin 747-53A2464 Revision 1 refers.\n\nCompliance: As specified in the Requirement document, with a revised effective date of 18 March 2004.\n\nThis Airworthiness Directive becomes effective on 18 March 2004.\n\nBackground: This Directive requires an inspection to identify all H-11 steel bolts installed in the latch fittings of the cargo doors, repetitive inspections for cracked or broken H-11 steel bolts, and eventual replacement of all H-11 steel bolts with Inconel bolts.\n\nBroken bolts in the latch fittings could reduce the capability of the door latch to keep the door closed, and result in loss of a cargo door and consequent rapid depressurisation of the aircraft.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 4 February 2004\n\n![](image.001.png)","sortOrder":1}],"analysis":{"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":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with focused, narrow scope. It addresses a specific mechanical defect in specific aircraft models. There is no indication of scope creep; the document maintains its original purpose of mandating bolt inspection/replacement for aviation safety."},"complexity_factors":["Very short document (under 300 words)","Only 3 defined applicability criteria (aircraft models and line numbers)","Single requirement referencing external technical document rather than spelling out procedures","No nested exceptions or conditional logic","Straightforward compliance timeline (single effective date)","Minimal cross-referencing (only to FAA AD and Boeing Service Bulletin)"],"plain_english_summary":"The Civil Aviation Safety Authority requires operators of early-model Boeing 747s (series 100/200/300/400, 747SR, 747SP, specific line numbers) to inspect and repeatedly monitor H‑11 steel bolts in cargo door latch fittings and to ultimately replace them with stronger Inconel bolts.  \n\nThis order addresses cracking/breakage risk that could lead to cargo-door loss, rapid decompression, and catastrophic airframe damage, and follows FAA and Boeing service guidance for the corrective work."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD stays within the original safety-focused purpose: identify and remove a specific unsafe part (H-11 steel bolts) from a defined set of aircraft and replace it with a specified alternative (Inconel bolts). It implements (by mandatory reference) FAA AD 2003-25-11 and Boeing service bulletin procedures. There is no substantive expansion beyond correcting the unsafe condition described in the Background section; the AD does not extend to other parts, aircraft types, or unrelated requirements."},"complexity_factors":["Clear, single-subject instrument (inspection and replacement of a particular bolt type) — limits conceptual complexity","References and mandates technical compliance to an external FAA AD (FAA AD 2003-25-11) rather than reproducing technical detail","References an external manufacturer document (Boeing Alert Service Bulletin 747-53A2464 Revision 1) for procedures","Narrow applicability by model and specific line numbers (requires operators to check applicability precisely)","Safety-critical repeated actions (initial inspection, repetitive inspections, eventual replacement) introduce operational complexity for scheduling and record-keeping","Dependence on external documents for compliance timing/methods (cross-referencing increases practical complexity for implementers)","Minimal internal definitional and procedural text (low legislative drafting complexity but higher operational reliance on external materials)"],"plain_english_summary":"**What this instrument does (mechanically)**\n\n- Requires operators of certain Boeing 747 aeroplanes to inspect the cargo door latch fittings to find any H-11 steel bolts, carry out repeated inspections for cracked or broken H-11 bolts, and ultimately replace all H-11 bolts with Inconel bolts. (See: Requirement; Compliance.)\n- The AD implements the inspection and replacement actions by mandating compliance with FAA AD 2003-25-11 and the referenced Boeing Alert Service Bulletin 747-53A2464 Revision 1 for the technical procedures and deadlines. (See: Requirement; Note.)\n- The AD applies only to a defined subset of Boeing 747 models and specific line numbers (Model 747-100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, 747SR and 747SP aircraft; line numbers 1–721, 976 and 982). (See: Applicability.)\n- The AD became effective 18 March 2004 and is issued under CASR subregulation 39.1(1) by a CASA delegate. (See: Compliance; Signature.)\n\n**Why the rule exists (stated rationale)**\n\n- The AD’s stated safety concern is that H-11 steel bolts in the cargo door latch fittings can crack or break. Broken bolts can reduce the latch’s ability to hold the cargo door closed, which could lead to loss of a cargo door and rapid depressurisation of the aircraft. The AD therefore requires inspection and replacement with more durable Inconel bolts. (See: Background.)\n\n**Who this affects and who decides**\n\n- Affected parties: owners/operators of the listed Boeing 747 aeroplanes (they must arrange and pay for inspections, repairs and bolt replacement), and maintenance organisations that perform the work. Parts suppliers that provide approved Inconel replacement bolts are also implicated. (See: Applicability; Requirement.)\n- Decision-maker: CASA (via its delegate) issued the AD under CASR subregulation 39.1(1); the AD mandates compliance with the FAA AD and Boeing service bulletin for technical detail. Maintenance providers execute the actions in accordance with those technical documents. (See: top paragraph; Requirement; Note.)\n\n**How it changes behaviour and what it costs**\n\n- Behaviour: Operators must schedule and perform initial inspections to identify H-11 bolts, carry out the repeated inspections required by the referenced FAA AD, and replace H-11 bolts with Inconel bolts according to the prescribed intervals and methods. Operators must follow the technical steps in the FAA AD/Boeing service bulletin rather than inventing their own procedures. (See: Requirement; Compliance; Note.)\n- Direct costs and burdens: inspection labour, parts (Inconel bolts), aircraft out-of-service time, record-keeping and compliance administration. These are borne by aircraft owners/operators. The AD creates business for maintenance, repair and overhaul (MRO) providers and for suppliers of approved replacement bolts. (See: Requirement; Background.)\n\n**Trade-offs, risks and implementation points to watch**\n\n- Opportunity cost: aircraft downtime for inspections and bolt replacement can disrupt schedules and revenue. The AD does not set monetary compensation — operators absorb these costs. (See: Compliance/Requirement.)\n- Supply/implementation risk: if Inconel bolts or approved repair facilities are scarce, operators may face delays or higher parts costs. The AD relies on external technical documents (FAA AD and Boeing service bulletin) for inspection intervals and methods, so timely access to those documents and approved parts is necessary. (See: Requirement; Note.)\n- Compliance risk: the safety outcome depends on correct, timely inspections and replacements by operators and maintenance organisations. The AD relies on CASA’s enforcement mechanisms under CASR for compliance. (See: CASR subreg 39.1(1) reference.)\n- Competitive/contract effects: operators must use approved procedures and parts; this constrains contracting freedom to the extent approval/airworthiness standards prescribe suppliers and methods. Maintenance work is likely to flow to certified MROs able to perform required inspections and replacements. (See: Requirement; Note.)\n\n**How the AD is framed legally**\n\n- The AD is a regulation-style safety directive: it identifies the affected fleet, states the corrective actions (by reference to FAA/Boeing documents), fixes an effective date, and is signed by a CASA delegate. It does not itself contain technical inspection procedures or interval tables; those are contained in the referenced FAA AD and Boeing service bulletin. (See: Requirement; Note; Compliance.)\n\n**Bottom line**\n\n- The AD mandates inspections and replacement of H-11 steel bolts in cargo door latch fittings on specified Boeing 747s because broken bolts can lead to door loss and depressurisation. Operators must follow the FAA AD and Boeing service bulletin for the detailed procedures and timing, and bear the costs and operational impacts of compliance. (See: Background; Requirement; Compliance.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-300-cargo-door-latch-fitting-h-11-steel-bolts","history":"/api/acts/ad-b747-300-cargo-door-latch-fitting-h-11-steel-bolts/history","analysis":"/api/acts/ad-b747-300-cargo-door-latch-fitting-h-11-steel-bolts/analysis","conflicts":"/api/acts/ad-b747-300-cargo-door-latch-fitting-h-11-steel-bolts/conflicts","importantCases":"/api/acts/ad-b747-300-cargo-door-latch-fitting-h-11-steel-bolts/important-cases","documents":"/api/acts/ad-b747-300-cargo-door-latch-fitting-h-11-steel-bolts/documents"}}