{"id":"F2006B02954","name":"AD/B737/54 Amdt 1 - Overhead Wire Bundle","slug":"ad-b737-54-amdt-1-overhead-wire-bundle","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42296,"registerId":"commonwealth-F2006B02954-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/54 Amdt 1 - Overhead Wire Bundle","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 737 Series Aeroplanes\n\nAD/B737/54\n\nAmdt 1\n\n  \nOverhead Wire Bundle 10/92\n\nApplicability: All model 737 aircraft listed in the Requirement Document.\n\nRequirement: Action in accordance with the Technical Requirements of FAA AD 90-25-14 Amendment 39-6824.\n\nNote: Boeing Service Letter 737-SL-24-58 dated 3 August 1988 refers.\n\nCompliance: The Compliance date of the original issue of this Directive was 21 March 1991. This Amendment is effective from 17 September 1992.\n\nNote: This Directive requires repetitive inspections at intervals not to exceed 120 days. Modification in accordance Boeing Service Bulletin 737-25-1274 Revision 1 dated 31 October 1991 is considered terminating action for this Directive.\n\nBackground: The original issue of this Directive was prompted by reports of burned wire bundles caused by short circuits resulting from chaffed wiring. This condition, if not corrected, could result in fire and smoke in the passenger cabin and cockpit. This amendment is issued to advise of terminating action for the Directive.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is an amendment to an existing Airworthiness Directive. The original 1991 directive required repetitive inspections. This 1992 amendment simply adds information about a terminating action (the modification option). The scope remains tightly focused on the specific wiring safety issue — it has not expanded beyond the original safety purpose."},"complexity_factors":["Very short document (under 300 words)","Only 1 substantive requirement (inspect wires + optional terminating action)","No defined terms section — relies entirely on external documents (FAA AD 90-25-14, Boeing Service Bulletin)","Simple conditional logic: either keep inspecting every 120 days OR do the modification to stop","Single cross-reference to US Federal Aviation Administration directive and Boeing technical document"],"plain_english_summary":"This CASA Airworthiness Directive mandates recurring inspections (no more than every 120 days) of overhead wire bundles on Boeing 737s in Australia to prevent chafed wiring that can short, burn, or cause smoke/fires in cabin and cockpit. Operators can permanently terminate the inspections by completing the Boeing Service Bulletin 737-25-1274 Revision 1 modification. It applies to all Australian operators, airlines and maintenance organisations of affected 737s."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment updates the original Directive by advising a terminating action: modification per Boeing Service Bulletin 737-25-1274 Rev 1 is considered terminating action for the repetitive inspections. The applicability remains the same (all listed 737 models), and the amendment records an effective date of 17 September 1992."},"complexity_factors":["Repetitive inspection requirement with a fixed maximum interval (120 days) creates ongoing compliance tracking and maintenance scheduling.","Existence of a terminating action (Boeing Service Bulletin 737-25-1274 Rev 1) requires operators to choose between recurring inspections or a one‑off modification.","Cross-reference to FAA AD 90-25-14 and Boeing service information requires operators to follow external technical documents.","Applicability tied to all model 737 aircraft listed in the Requirement Document requires fleet-level application and record-keeping.","Amendment effective date (17 September 1992) imposes a fixed compliance timeline to manage.","Safety consequence (fire/smoke risk) raises priority and potential operational disruption during inspections or modification works."],"plain_english_summary":"This Airworthiness Directive requires operators of the listed Boeing 737 models to perform repetitive inspections of an overhead wire bundle at intervals not exceeding 120 days to detect chafing that can cause short circuits, fire or smoke. Completing the Boeing Service Bulletin 737-25-1274 Revision 1 modification is accepted as a terminating action to stop the inspections. The Civil Aviation Safety Authority mandates compliance; aircraft operators must carry out the inspections or pay for the terminating modification (amendment effective 17 September 1992)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-54-amdt-1-overhead-wire-bundle","history":"/api/acts/ad-b737-54-amdt-1-overhead-wire-bundle/history","analysis":"/api/acts/ad-b737-54-amdt-1-overhead-wire-bundle/analysis","conflicts":"/api/acts/ad-b737-54-amdt-1-overhead-wire-bundle/conflicts","importantCases":"/api/acts/ad-b737-54-amdt-1-overhead-wire-bundle/important-cases","documents":"/api/acts/ad-b737-54-amdt-1-overhead-wire-bundle/documents"}}