{"id":"F2006B03294","name":"AD/B767/112 - MLG Beam Outboard Support Fuse Pins","slug":"ad-b767-112-mlg-beam-outboard-support-fuse-pins","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42731,"registerId":"commonwealth-F2006B03294-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B767/112 - MLG Beam Outboard Support Fuse Pins","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 767 Series Aeroplanes\n\nAD/B767/112 MLG Beam Outboard Support Fuse Pins 8/99\n\nApplicability: Model 767 series aircraft, line numbers 1 through 609; having 4330M steel fuse pins installed in the outboard support of the main landing gear (MLG) beam.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 99-11-14 Amdt 39- 11185.\n\nNote: Installation of newer-type 15-5PH CRES fuse pins in accordance with Boeing Alert Service Bulletin 767-57A0054 Revision 2 or Revision 3 constitutes terminating action for the repetitive inspection requirements of this Directive.\n\nCompliance: As specified in the Requirement Document for the initial and repetitive inspection requirements, with a revised effective date of 12 August 1999.\n\nThis Airworthiness Directive becomes effective on 12 August 1999.\n\nBackground: The FAA received a report of corrosion on a fuse pin in the outboard support of the MLG beam. Corrosion or chrome plating cracks could result in the failure of a fuse pin and consequent collapse of the landing gear.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope — addressing a specific safety defect in a defined subset of Boeing 767 aircraft. It does not expand beyond its original technical safety purpose."},"complexity_factors":["Single, specific technical requirement referencing an external FAA document rather than spelling out detailed procedures","Only 2 defined applicability criteria (aircraft line numbers and specific steel type)","One clear terminating action (installation of newer pins) that ends the compliance obligation","No nested exceptions, conditional logic, or cross-references to other Australian legislation","Short, self-contained document (approximately 200 words) with straightforward structure"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection or replacement of specific 4330M steel fuse pins in the outboard support of main landing gear on certain Boeing 767s (serials 1–609). It targets operators using the older pins because chrome-plating corrosion or cracking can lead to landing gear collapse. Compliance follows FAA AD 99-11-14; installing the newer pins per Boeing service bulletin permanently ends the inspection requirement."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive sets a targeted requirement for Model 767 aircraft line numbers 1–609 with 4330M fuse pins; it does not expand applicability beyond those aircraft or parts. It replaces ongoing inspections only when operators install the specified 15-5PH CRES pins per Boeing service bulletin; no broader scope change is indicated in the source text."},"complexity_factors":["Cross-reference to FAA AD 99-11-14 for the substantive inspection and corrective procedures (Requirement).","Dependence on an external manufacturer document as terminating action: Boeing Alert Service Bulletin 767-57A0054 Rev 2 or 3 (Note).","Technical material change between specific alloys (4330M steel versus 15-5PH CRES) requiring parts availability and qualified replacement (Applicability/Note).","Repetitive inspection regime whose intervals and triggers are specified in the Requirement Document rather than fully in the directive (Requirement/Compliance).","Operational and maintenance burden for operators: recurring inspections, potential replacement downtime and parts procurement (Requirement/Note).","Safety consequence if non-compliant: risk of fuse-pin failure and landing gear collapse (Background).","Fixed effective date for compliance (12 August 1999) which constrains scheduling (Compliance)."],"plain_english_summary":"Requires inspections of specified Boeing 767 main landing gear outboard support fuse pins and, if corrosion or plating cracks are found, corrective action per the referenced FAA directive. Applies to Model 767 aircraft, line numbers 1–609, fitted with 4330M steel fuse pins. The rule aims to prevent fuse-pin failure that could cause landing-gear collapse; installing newer 15-5PH CRES pins per Boeing service instructions removes the need for repeated inspections."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-112-mlg-beam-outboard-support-fuse-pins","history":"/api/acts/ad-b767-112-mlg-beam-outboard-support-fuse-pins/history","analysis":"/api/acts/ad-b767-112-mlg-beam-outboard-support-fuse-pins/analysis","conflicts":"/api/acts/ad-b767-112-mlg-beam-outboard-support-fuse-pins/conflicts","importantCases":"/api/acts/ad-b767-112-mlg-beam-outboard-support-fuse-pins/important-cases","documents":"/api/acts/ad-b767-112-mlg-beam-outboard-support-fuse-pins/documents"}}