{"id":"F2006B02861","name":"AD/B737/158 Amdt 1 - Fuel System Wiring Shielding and Separation","slug":"ad-b737-158-amdt-1-fuel-system-wiring-shielding-and-separation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42203,"registerId":"commonwealth-F2006B02861-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/158 Amdt 1 - Fuel System Wiring Shielding and Separation","content":"![](image.001.png)\n\n![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B737/158 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)\n\nBoeing 737 Series Aeroplanes\n\nAD/B737/158\n\nAmdt 1\n\n  \nFuel System Wiring Shielding and Separation 6/2002\n\nApplicability: All Model 737-100, \\-200, \\-300, \\-400 and \\-500 series aeroplanes.\n\nRequirement: Provide shielding and separation of the fuel system wiring (that is routed to the fuel tanks) from adjacent wiring in accordance with either:\n\n    a method approved by the Section Head, Systems; Certification Standards Branch; Aviation Standards Division; Civil Aviation Safety Authority, or\n\n    b. FAA Supplemental Type Certificate (STC) No ST00847SE dated 6 October 2000, or\n\n    c. FAA STC No ST00127BO dated 5 September 2000.\n\nNote 1: FAA AD 99-03-04 Amdt 39-11018 paragraph (a) refers.\n\nNote 2: FAA Transport Airplane Directorate Letter 130S-00-0626 dated 11 October 2000 approves FAA STC ST00847SE as an Alternate Method of Compliance (AMOC) for paragraph (a) of FAA AD 99-03-04.\n\nNote 3: Applications for the approval of a method to provide shielding and separation of the fuel wiring system are to be forwarded through the Engineering Support Branch office responsible for the applicant.\n\nNote 4: AD/B737/156 addresses the fuel tank vent system provisions of FAA AD 99- 03-04 paragraph (b).\n\nNote 5: FAA Transport Airplane Directorate Letter 130S-00-0632 dated 13 October 2000 approves FAA STC ST00127BO as an AMOC for paragraph (a) of FAA AD 99- 03-04.\n\nCompliance: Before 10 March 2003.\n\nThis Amendment becomes effective on 13 June 2002.\n\nBoeing 737 Series Aeroplanes\n\nAD/B737/158 Amdt 1 (continued)\n\nBackground: The original issue of this Directive required installation of components to provide shielding and separation of the fuel system wiring (that is routed to the fuel tanks) from adjacent wiring. The issue of the referenced FAA Airworthiness Directive was prompted by testing results, obtained in support of an accident investigation, and by re-examination of possible causes of a similar accident.\n\nThis Amendment introduces an alternative method of compliance.\n\nThe original issue of this Airworthiness Directive became effective on 9 August 2001.\n\n![Signature of James Coyne, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 3 May 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 22 May 2002.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"The amendment does not expand the affected fleet or change the underlying safety action (shielding/separation) but adds alternative approved compliance routes by accepting two FAA STCs (ST00847SE and ST00127BO) as methods of compliance. In short, it broadens acceptable compliance pathways while keeping applicability and the compliance deadline unchanged."},"complexity_factors":["Cross-reference to external FAA materials (FAA AD 99‑03‑04 and two FAA STCs) creates dependency on foreign certification documents.","Multiple compliance pathways (CASA‑approved bespoke method or two specific FAA STCs) require choice and coordination by operators.","Regulatory approvals: bespoke methods must be approved by the Section Head, Systems (Certification Standards Branch), adding administrative discretion.","Application routing requirement through the Engineering Support Branch adds procedural steps and potential delay.","Technical nature of work (shielding and separation of fuel tank wiring) requires specialised engineering and installation resources.","Interplay with prior AD (revocation of original AD/B737/158 and cross‑reference to AD/B737/156) increases traceability and recordkeeping needs.","Fixed compliance deadline requires fleet planning and potential grounding/maintenance scheduling costs."],"plain_english_summary":"This Airworthiness Directive requires operators of Boeing 737‑100/200/300/400/500 series aeroplanes to provide shielding and separation of wiring routed to the fuel tanks from adjacent wiring, using either a CASA‑approved method or one of two specified FAA Supplemental Type Certificates (STCs). Compliance must be completed before 10 March 2003. CASA says the measure follows testing and re‑examination of accidents; Amendment 1 adds the two FAA STCs as alternative methods of compliance, leaving operators to arrange and pay for the modification."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment stays within the original scope of the 2001 directive. It adds alternative compliance methods (the two FAA STCs) but does not expand the applicability to new aircraft types or introduce new safety issues. The core requirement — shielding and separating fuel system wiring — remains unchanged."},"complexity_factors":["Short, single-purpose directive (approximately 400 words)","Only 5 defined compliance pathways (3 explicit methods plus 2 referenced FAA documents)","Simple conditional structure: applicability → requirement → compliance deadline","Cross-references to 2 FAA STCs and 1 FAA AD, but these are clearly identified with document numbers","5 explanatory notes that clarify rather than complicate","No nested exceptions or recursive definitions","Single amendment layer (Amdt 1) with straightforward background explanation"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires owners/operators of Boeing 737-100/200/300/400/500 series to modify fuel-system wiring—shielding and separating it from other wiring—to prevent electrical sparks that could ignite fuel vapors. It responds to fuel-tank explosion risks and must be complied with by 10 March 2003. Compliance can be met by CASA-approved methods or by using either of two pre‑approved FAA STCs; this amendment adds those options."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-158-amdt-1-fuel-system-wiring-shielding-and-separation","history":"/api/acts/ad-b737-158-amdt-1-fuel-system-wiring-shielding-and-separation/history","analysis":"/api/acts/ad-b737-158-amdt-1-fuel-system-wiring-shielding-and-separation/analysis","conflicts":"/api/acts/ad-b737-158-amdt-1-fuel-system-wiring-shielding-and-separation/conflicts","importantCases":"/api/acts/ad-b737-158-amdt-1-fuel-system-wiring-shielding-and-separation/important-cases","documents":"/api/acts/ad-b737-158-amdt-1-fuel-system-wiring-shielding-and-separation/documents"}}