{"id":"F2006B02966","name":"AD/B737/66 Amdt 1 - Electrical Wiring Loom","slug":"ad-b737-66-amdt-1-electrical-wiring-loom","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42308,"registerId":"commonwealth-F2006B02966-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/66 Amdt 1 - Electrical Wiring Loom","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/B737/66\n\nAmdt 1\n\n  \nElectrical Wiring Loom 5/96\n\nApplicability: All Boeing 737-300, \\-400 and \\-500 series aircraft.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 92-04-07 Amdt 39- 8178.\n\nCompliance: The original compliance was as specified in the Requirement Document, with an effective date of 30 April 1992.\n\nThis amendment is effective from 25 April 1996.\n\nIncorporation of Boeing Alert Service Bulletin 737-25A1299 dated 18 June 1992 (Examination and Change of Door Header Support Bracket Assembly and Wire Bundle Installations) provides terminating action for the repetitive inspections of this Directive.\n\nBackground: This AD is issued because of a report of a burned wire bundle, located above the cockpit to cabin door header frame, caused by short circuits resulting from chafed wiring. This condition, if not corrected, could result in smoke and fire in the passenger cabin and cockpit.\n\nThis amendment introduces optional terminating action for the inspection requirements of this Directive.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment adds an optional terminating action: incorporation of Boeing Alert Service Bulletin 737‑25A1299 (dated 18 June 1992) removes the need for the prior repetitive inspections. The applicability (Boeing 737‑300/‑400/‑500) and original inspection requirement (per FAA AD 92‑04‑07) remain; the amendment (effective 25 April 1996) changes available compliance options and associated cost trade-offs (Requirement; Incorporation; Compliance)."},"complexity_factors":["Cross-reference to external FAA AD rather than containing full technical steps","Optional terminating action via a manufacturer service bulletin creates decision point for operators","Repetitive inspections versus one‑off modification creates different cost/time profiles","Applicability limited to specific Boeing 737 submodels reduces population but requires fleet-level compliance tracking","Clear safety rationale with limited regulatory discretion — low procedural ambiguity"],"plain_english_summary":"This airworthiness directive requires operators of Boeing 737‑300/‑400/‑500 aircraft to comply with the inspection and corrective actions set out in FAA AD 92‑04‑07 and, by this amendment, permits incorporation of Boeing Alert Service Bulletin 737‑25A1299 as optional terminating action (Applicability; Requirement; Incorporation). The AD responds to a reported burned wire bundle that could cause smoke or fire (Background). Operators therefore choose between repeated inspections (ongoing compliance cost and logistic burden) or a one‑off modification (upfront cost to remove the inspection requirement)."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment stays within the original scope of the directive. The original AD addressed a specific wiring fire hazard. This amendment simply adds an optional permanent fix (terminating action) to the existing inspection regime. It does not expand to new aircraft types, new safety issues, or new regulatory areas."},"complexity_factors":["Very short document (under 300 words)","Only 3 defined elements: applicability (aircraft models), compliance date, and reference to external technical documents","Single amendment with straightforward purpose: introducing optional terminating action","Heavy reliance on external documents (FAA AD and Boeing Service Bulletin) for actual technical requirements — the directive itself does not contain the detailed instructions","No nested exceptions or conditional logic within the directive text itself","Clear, linear structure: applicability → requirement → compliance → background"],"plain_english_summary":"This CASA Airworthiness Directive targets Boeing 737-300/-400/-500 aircraft to fix wiring chafing above the cockpit‑to‑cabin door that has caused shorts, smoke and fire. Instead of indefinite repetitive inspections, the April 1996 amendment allows a permanent repair—installing a modified door bracket and rerouting the wiring per Boeing/FAA instructions—affecting operators and maintenance organizations and improving safety while reducing recurring costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-66-amdt-1-electrical-wiring-loom","history":"/api/acts/ad-b737-66-amdt-1-electrical-wiring-loom/history","analysis":"/api/acts/ad-b737-66-amdt-1-electrical-wiring-loom/analysis","conflicts":"/api/acts/ad-b737-66-amdt-1-electrical-wiring-loom/conflicts","importantCases":"/api/acts/ad-b737-66-amdt-1-electrical-wiring-loom/important-cases","documents":"/api/acts/ad-b737-66-amdt-1-electrical-wiring-loom/documents"}}