{"id":"F2006B03060","name":"AD/B747/158 - Fuel Shut-Off Valve Wiring","slug":"ad-b747-158-fuel-shut-off-valve-wiring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42419,"registerId":"commonwealth-F2006B03060-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/158 - Fuel Shut-Off Valve Wiring","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/B747/158 Fuel Shut-Off Valve Wiring 6/96\n\nApplicability: This Directive is applicable to Model 747-400 series aircraft, with line positions 696 through 1046 inclusive, with the exception of line position 722 and 1035.\n\nRequirement: Replace the fuel shut-off valve wire and sleeve in each engine strut conduit with a wire in two non-metallic sleeves in accordance with Boeing Alert Service Bulletin 747-28A2186 dated 19 January 1995.\n\nWire replacements accomplished prior to 23 May 1996, in accordance with Boeing Alert Service Bulletin 747-54A2157 dated 12 January 1995 or Revision 1 dated 3 August 1995, are considered acceptable for compliance with this requirement.\n\nNote: FAA AD 96-03-14 Amdt 39-9511 refers.\n\nCompliance: Prior to 23 May 1997.\n\nBackground: The FAA has received reports of additional occurrences of chafing and shorting of the engine fuel shut-off valve wiring since AD 89-14-04 Amdt 39-6246 was issued. The chafing and subsequent shorting of the wiring could result in the flight crews' inability to shut off the fuel supply in the event of an engine fire. Actions required by this Directive are designed to decrease the likelihood of wire chafing occurring.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted airworthiness directive addressing a specific wiring defect in a specific aircraft model. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single, specific technical requirement with clear reference to manufacturer service bulletin","Limited applicability scope (specific aircraft line positions with two explicit exclusions)","One simple exception/alternative compliance pathway","No defined terms section, no cross-references to other legislation beyond a note about related FAA directive","Plain language background explanation included","Single compliance deadline with no conditional triggers or phased implementation"],"plain_english_summary":"This Airworthiness Directive requires operators of certain Boeing 747‑400s (line positions 696–1046, except 722 and 1035) to replace a chafing-prone wire in the engine fuel shut‑off system with a configuration using two non‑metallic sleeves. The change prevents electrical shorts that could stop pilots from cutting fuel to an engine during a fire. Work must be completed by 23 May 1997; prior compliance via Boeing SB 747‑54A2157 before 23 May 1996 is acceptable."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This Directive updates corrective action following a prior AD by mandating wiring replacement on specified 747-400 line positions (with two exceptions), setting a firm compliance date, and formally accepting certain earlier Boeing-compliant replacements as compliant. In short, it extends and specifies remedial scope to address additional chafing incidents (Background; Applicability; Requirement; Compliance)."},"complexity_factors":["Safety-critical technical requirement to replace engine fuel shut-off valve wiring (Requirement/Background)","Narrow applicability defined by specific line positions with explicit exceptions, increasing record-checking (Applicability)","Mandated compliance with an external Boeing Alert Service Bulletin for the installation method (Requirement)","Acceptance of earlier Boeing service-bulletin work done before a specific date creates conditional equivalence (Requirement/Note)","Fixed compliance deadline imposes scheduling and operational disruption for operators (Compliance)","Cross-reference to prior FAA and earlier ADs adds regulatory coordination considerations (Note/Background)","Clear, prescriptive actions and dates reduce interpretative ambiguity and legal uncertainty (Compliance)"],"plain_english_summary":"This Airworthiness Directive requires operators of specified Boeing 747-400 aeroplanes to replace the engine fuel shut-off valve wire and sleeve with a wire in two non-metallic sleeves, using Boeing Alert Service Bulletin 747-28A2186. Owners/operators pay for and perform the work; the Civil Aviation Safety Authority requires and enforces compliance.\n\nThe rule aims to prevent wiring chafing and shorting that could stop crews from shutting off fuel in an engine fire. Work must be done by 23 May 1997; certain earlier Boeing-compliant replacements are accepted."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-158-fuel-shut-off-valve-wiring","history":"/api/acts/ad-b747-158-fuel-shut-off-valve-wiring/history","analysis":"/api/acts/ad-b747-158-fuel-shut-off-valve-wiring/analysis","conflicts":"/api/acts/ad-b747-158-fuel-shut-off-valve-wiring/conflicts","importantCases":"/api/acts/ad-b747-158-fuel-shut-off-valve-wiring/important-cases","documents":"/api/acts/ad-b747-158-fuel-shut-off-valve-wiring/documents"}}