{"id":"F2006B03019","name":"AD/B747/117 - Inspection of Cockpit Wire Bundles","slug":"ad-b747-117-inspection-of-cockpit-wire-bundles","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42378,"registerId":"commonwealth-F2006B03019-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/117 - Inspection of Cockpit Wire Bundles","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/B747/117 Inspection of Cockpit Wire Bundles 4/93\n\nApplicability: All model 747 series airplanes with the exception of the 747-400 series. Requirement: Visually inspect the wire bundles located above the P6 panel around station 400,\n\nwater line 385, right butt line 15. If necessary, repair the wires and reposition the\n\nbundles in accordance with Boeing Alert Service Bulletin 747-24A2186 dated 14 January 1993.\n\nNote: FAA AD 92-27-12 Amendment 39-8447 refers.\n\nCompliance: Unless previously accomplished, inspect and if necessary repair the wire bundles prior to 15 April 1993. Thereafter, if the wire bundles do not meet the clearances specified in the Requirement Document, inspect the bundles at 120 day intervals until the bundles are repositioned.\n\nBackground: Recently, an electrical wiring short circuit was detected in the cockpit of a Boeing 747-300 series aircraft. The cockpit filled with smoke, numerous circuit breakers popped and sounds of electrical arcing were heard, resulting in a rejected take-off. A partial inspection of the world wide fleet revealed a further 11 cases of wire bundle damage in the same location as on the aircraft that experienced the incident.\n\nThe affected wire bundles contain wires that carry power and data for all the captain’s and first officer’s instruments (with the exception of standby airspeed, compass and altitude) that are necessary for continued safe flight. Compliance with this Directive will decrease the potential for a similar incident occurring.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive's scope aligns with its stated purpose in the text: inspect and, if necessary, repair and reposition the specified cockpit wire bundles on applicable 747 models to prevent electrical shorts. It is limited to the named airframe models and the precise wiring location, mandates an initial compliance date and repeating inspections until clearance is achieved, and relies on Boeing's Alert Service Bulletin for the corrective procedure."},"complexity_factors":["Technical location references (station 400, water line 385, right butt line 15) require trained maintenance personnel and aircraft drawings to identify the exact area (Applicability/Requirement).","Repairs and repositioning are performed to a separate external document: Boeing Alert Service Bulletin 747-24A2186 (Requirement), creating dependency on that manufacturer's procedure for compliance.","A fixed initial compliance deadline (15 April 1993) plus a condition-triggered recurring inspection interval (every 120 days) until remedial action is completed increases ongoing operational maintenance scheduling (Compliance).","Applicability is model-specific (all 747s except -400), which narrows scope but requires operators to verify fleet type applicability (Applicability).","Safety-critical nature: affected wires supply power/data to most captain and first officer instruments, so failure modes have immediate flight-safety implications and justify rapid compliance (Background).","Cross-reference to FAA AD 92-27-12 adds an external regulatory coordination element (Note)."],"plain_english_summary":"This Airworthiness Directive requires operators of Boeing 747 series aeroplanes (except the 747-400) to visually inspect a specific cockpit wire bundle above the P6 panel (station 400, waterline 385, right butt line 15) and, if needed, repair and reposition the wires following Boeing Alert Service Bulletin 747-24A2186. Initial inspection had to be done by 15 April 1993; if clearances aren’t met, inspections must continue every 120 days until repositioned. It aims to reduce the risk of electrical shorting that can affect primary flight instruments."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific, identified wiring defect in a defined aircraft type. The scope remains precisely limited to the original safety concern without expansion into broader maintenance regimes or additional aircraft systems."},"complexity_factors":["Single, specific technical requirement (visual inspection of one defined location)","Only 3 defined reference points (station 400, water line 385, right butt line 15)","Simple conditional structure: inspect → repair if necessary → ongoing monitoring if clearance inadequate","Single cross-reference to Boeing Service Bulletin and FAA AD for technical details","No nested exceptions or complex definitional sections","Length: approximately 250 words"],"plain_english_summary":"This CASA Airworthiness Directive requires operators of Boeing 747‑100/200/300 series in Australia to inspect the cockpit‑ceiling wiring above the P6 panel, repair and reposition any damaged wiring per Boeing instructions, and repeat inspections every 120 days until adequate clearance is achieved (with an initial completion deadline of 15 April 1993 if not already done).\n\nThe order follows a 747‑300 incident where a wiring short caused cockpit smoke and multiple instrument failures; similar damage was found on 11 other aircraft and the wiring powers critical flight instruments."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-117-inspection-of-cockpit-wire-bundles","history":"/api/acts/ad-b747-117-inspection-of-cockpit-wire-bundles/history","analysis":"/api/acts/ad-b747-117-inspection-of-cockpit-wire-bundles/analysis","conflicts":"/api/acts/ad-b747-117-inspection-of-cockpit-wire-bundles/conflicts","importantCases":"/api/acts/ad-b747-117-inspection-of-cockpit-wire-bundles/important-cases","documents":"/api/acts/ad-b747-117-inspection-of-cockpit-wire-bundles/documents"}}