{"id":"F2006B03052","name":"AD/B747/150 Amdt 1 - Upper Link Fuse Pin","slug":"ad-b747-150-amdt-1-upper-link-fuse-pin","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42411,"registerId":"commonwealth-F2006B03052-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/150 Amdt 1 - Upper Link Fuse Pin","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/B747/150\n\nAmdt 1\n\n  \nUpper Link Fuse Pin 10/97\n\nApplicability: Model 747 and 747-400 series aircraft with line numbers 1 through 967, and 969 through 992; excluding aircraft equipped with Pratt and Whitney PW4000 or General Electric CF6-80C2 series engines; and excluding aircraft on which the strut/wing modification has been accomplished in accordance with FAA ADs 95-13-05, 95-13- 07, or 95-10-16, as applicable.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 97-14-06 Amdt 39- 10064.\n\nNote: Boeing Service Bulletins 747-54-2155 and 747-54A2166 refer.\n\nCompliance: As specified in the requirement document with a revised effective date of 11 September 1997.\n\nBackground: The FAA received reports of cracked or corroded fuse pins on the upper link of the inboard and outboard struts. This condition could result in fracturing of the pins and the possible separation of an engine from the aircraft.\n\nAmendment 1 is issued in response to a new FAA AD which reduces the compliance times of actions associated with certain fuse pins and provides for optional terminating action for the requirements of this Directive. This amendment is prompted by a report received by the FAA of fracturing of a bulkhead style fuse pin located in the inboard strut at the forward end of the upper link.\n\nThe original issue of this airworthiness directive became effective on 22 June 1995.","sortOrder":0}],"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 altered implementation rather than the underlying hazard: it reduces the compliance times and adds an optional terminating action to the original AD (original AD effective 22 June 1995). Applicability exclusions remain based on engine type and prior strut/wing modifications; the amendment was prompted by a FAA report of a fractured bulkhead fuse pin and changes the timing and available compliance pathways."},"complexity_factors":["External cross-reference: compliance depends on following FAA AD 97-14-06 and related Boeing Service Bulletins rather than being self-contained.","Applicability conditions: limited by specific line numbers, excluded engine types (PW4000, CF6-80C2) and prior strut/wing modifications, requiring record checks.","Revised deadlines: Amendment 1 reduces compliance times, creating accelerated scheduling and logistical burden for operators.","Optional terminating action: availability of an optional modification creates a choice for operators with differing cost and operational implications.","Safety-critical technical work: addresses a component whose failure could lead to engine separation, so work must meet exacting maintenance standards.","Inter-agency alignment: Australian AD adopts FAA requirements, so operators must track foreign AD changes for domestic compliance."],"plain_english_summary":"This airworthiness directive requires operators of specified Boeing 747 and 747-400 aircraft (line numbers 1–967 and 969–992, excluding certain engines and aircraft with specified strut/wing modifications) to carry out the technical actions set out in FAA AD 97-14-06 to inspect, repair or replace upper-link fuse pins. Amendment 1 shortens the compliance times and offers an optional terminating action. It matters because cracked or corroded fuse pins can fracture and risk engine separation."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"The original 1995 directive addressed cracked/corroded fuse pins with standard compliance times. Amendment 1 significantly tightens the scope by reducing compliance times for certain pins and adding optional terminating action—effectively expanding the regulatory burden on operators while offering a pathway to permanent resolution. The amendment responds to new safety data (actual fracture report) rather than just preventive concerns."},"complexity_factors":["Multiple exclusion criteria requiring cross-referencing of engine types and prior modification status","Dependency on external technical documents (FAA AD 97-14-06 and two Boeing Service Bulletins) not reproduced in the text","Specific line number ranges with a notable gap (line 968 excluded)","Nested applicability conditions: model series + line numbers - engine types - prior modifications","Amendment structure requires understanding of relationship between original AD (1995) and Amendment 1 (1997)"],"plain_english_summary":"This airworthiness directive mandates inspection and, if needed, replacement of the metal \"fuse pins\" that attach engine struts to the wings on certain Boeing 747/747‑400s because cracking or corrosion could allow an engine to detach. It tightens inspection deadlines, offers an optional permanent repair to end repetitive checks, and applies to specified production-line aircraft (with noted engine and modification exclusions). Compliance follows FAA AD 97‑14‑06 and Boeing service bulletins by 11 Sept 1997."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-150-amdt-1-upper-link-fuse-pin","history":"/api/acts/ad-b747-150-amdt-1-upper-link-fuse-pin/history","analysis":"/api/acts/ad-b747-150-amdt-1-upper-link-fuse-pin/analysis","conflicts":"/api/acts/ad-b747-150-amdt-1-upper-link-fuse-pin/conflicts","importantCases":"/api/acts/ad-b747-150-amdt-1-upper-link-fuse-pin/important-cases","documents":"/api/acts/ad-b747-150-amdt-1-upper-link-fuse-pin/documents"}}