{"id":"F2006B02933","name":"AD/B737/3 - A.P.U. Generator, Feeder Wire Bundle - Inspection","slug":"ad-b737-3-a-p-u-generator-feeder-wire-bundle-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42275,"registerId":"commonwealth-F2006B02933-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/3 - A.P.U. Generator, Feeder Wire Bundle - Inspection","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\n| AD/B737/3      | A.P.U. Generator, Feeder Wire Bundle - Inspection                     | 10/84 |\n| -------------- | --------------------------------------------------------------------- | ----- |\n| Applicability: | All model 737 aircraft with S/Nos. specified in Requirement Document. |       |\n| Requirement:   | Boeing SB 737-24-1038. FAA AD 84-10-04 AMDT 39-4872 refers.           |       |\n\nCompliance: 1. Inspect A.P.U. generator feeder wire bundle for interference with control cables prior to further flight after 30 November 1984 as detailed in Requirement Document.\n\n2. Repeat inspection of Para 1 each time the A.P.U. generator circuit breaker is removed.\n\nNote: Termination of the requirement of this Directive may be accomplished by modifying the feeder wire bundle installation in accordance with SB 737-24-1038.\n\nBackground: Instances of interference between the A.P.U. generator feeder wire bundle and the first officers elevator down control cable have occurred. The control cable has been severed due to the resultant abrasion and arcing between the two.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive matches its stated purpose in the Background: prevent interference between the APU feeder bundle and the elevator control cable. It remains narrowly scoped to specified 737 serial numbers and prescribes inspection or modification per Boeing SB 737-24-1038 (Applicability; Requirement; Compliance; Note; Background)."},"complexity_factors":["Narrow technical focus: single component (APU generator feeder wire bundle) and single hazard (interference with control cable).","Simple recurring compliance trigger: inspection before further flight after 30/11/1984 and each time the APU generator circuit breaker is removed (Compliance).","Termination depends on carrying out a modification per an external Boeing service bulletin (SB 737-24-1038) (Note).","Applicability limited to serial numbers specified in an external Requirement Document—requires cross-referencing that document.","References external FAA AD and Boeing SB for procedural details, so implementers must consult those sources (Requirement)."],"plain_english_summary":"This airworthiness directive requires operators of specified Boeing 737s to inspect the APU generator feeder wire bundle for interference with control cables before the next flight after 30 November 1984, and to repeat that inspection each time the APU generator circuit breaker is removed (Compliance). Operators must perform the inspections and may end the inspection requirement by modifying the feeder bundle installation per Boeing SB 737-24-1038; the measure responds to incidents where the bundle abraded and severed the first officer’s elevator down control cable (Note; Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical interference issue. The scope remains exactly as intended: inspecting and potentially modifying a specific wiring bundle on Boeing 737 aircraft to prevent control cable severance."},"complexity_factors":["Very short document (under 300 words)","Only 2 compliance requirements with clear conditions","Single defined term (A.P.U. = Auxiliary Power Unit, explained in context)","No nested exceptions or conditional logic beyond simple 'if-then' (if circuit breaker removed, then inspect)","References external technical documents (Boeing Service Bulletin, FAA AD) but does not incorporate their text","Clear termination condition provided (modification per SB allows ending inspections)"],"plain_english_summary":"This Airworthiness Directive requires Australian operators of affected Boeing 737s to inspect a wiring bundle near the APU generator for chafing or contact with the co‑pilot’s elevator control cables. Friction and electrical arcing have worn through control cables, risking severed elevator control and loss of pitch authority. Inspections are mandatory before flight after 30 Nov 1984 and whenever the APU generator circuit breaker is removed; a Boeing service‑bulletin wiring modification provides a permanent compliance option."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-3-a-p-u-generator-feeder-wire-bundle-inspection","history":"/api/acts/ad-b737-3-a-p-u-generator-feeder-wire-bundle-inspection/history","analysis":"/api/acts/ad-b737-3-a-p-u-generator-feeder-wire-bundle-inspection/analysis","conflicts":"/api/acts/ad-b737-3-a-p-u-generator-feeder-wire-bundle-inspection/conflicts","importantCases":"/api/acts/ad-b737-3-a-p-u-generator-feeder-wire-bundle-inspection/important-cases","documents":"/api/acts/ad-b737-3-a-p-u-generator-feeder-wire-bundle-inspection/documents"}}