{"id":"F2006B10568","name":"AD/HS 748/32 - Port and Starboard Wing Dry Bays Electrical Looms and Fuel Cross-Feed Drains","slug":"ad-hs-748-32-port-and-starboard-wing-dry-bays-electrical-looms-and-fuel-cross-feed-drains","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116399,"registerId":"commonwealth-F2006B10568-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 748/32 - Port and Starboard Wing Dry Bays Electrical Looms and Fuel Cross-Feed Drains","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 issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 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\nBritish Aerospace (Hawker Siddeley) HS 748 Series Aeroplanes\n\nAD/HS 748/32 Port and Starboard Wing Dry Bays Electrical\n\nLooms and Fuel Cross-Feed Drains\n\n  \n6/2003\n\nApplicability: All HS.748 series aeroplanes.\n\nRequirement: 1. Remove the fuel cross-feed drain stub pipe assemblies, together with the drain valve securing brackets, in the port and starboard wing dry bays and install a blanking caps on the fuel cross-feed pipe stubs in accordance with the Accomplishment Instructions of BAe Systems Service Bulletin (SB) HS 748-28- 045 dated 12 February 2003.\n\n2. Inspect the electrical cable looms in the port and starboard wing dry bays for chafe damage in accordance with the Accomplishment Instructions SB HS 748- 28-045 and, if necessary, replace any damaged electrical wires, secure the loom and ensure that the looms are protected.\n\nNote: SB HS 748-28-045 has been classified as Mandatory by the CAA(UK).\n\nCompliance: For Requirement 1 \\- Before 12 February 2004.\n\nFor Requirement 2 \\- Before further flight immediately following accomplishment of Requirement 1.\n\nThis Airworthiness Directive becomes effective on 12 June 2003.\n\nBackground: BAe Systems have received a report from an ATP operator of a fire in the dry bay area of the wing, which was attributed to chafing damage between electrical cables and the fuel cross- feed drain stub pipe assembly.\n\nBritish Aerospace (Hawker Siddeley) HS 748 Series Aeroplanes\n\nAD/HS 748/32 (continued)\n\nAs this may also occur in HS 748 series aeroplanes, this Directive requires the removal of the fuel cross- feed drain stub pipe assemblies, inspection of the electrical looms and, if necessary, rectification action.\n\n![](image.002.png)  \n\nJim Coyne\n\nDelegate of the Civil Aviation Safety Authority 28 April 2003\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 21 May 2003.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive's scope in the text aligns with its stated purpose: remove fuel cross‑feed drain stub pipes and inspect/rectify wing dry‑bay electrical looms on all HS 748 series aeroplanes to address reported chafing-related fire risk. The instrument applies fleet-wide and sets specific compliance timings; the text does not expand or narrow that scope beyond the stated measures."},"complexity_factors":["Technical maintenance tasks: removal/blanking of fuel pipe stubs and inspection/repair/protection of electrical looms (Requirement 1–2; SB HS 748‑28‑045).","Time-critical, safety‑critical compliance: Requirement 1 deadline (before 12 Feb 2004) and Requirement 2 required before further flight after Requirement 1 (Compliance).","Dependence on an external manufacturer Service Bulletin for procedural detail; SB is referenced as the method of compliance and classified Mandatory by CAA(UK) (Requirement; Note).","Wide fleet applicability: covers all HS 748 series aeroplanes, increasing aggregate cost and coordination needs for operators (Applicability).","Direct cost and operational impact fall on aircraft operators/maintenance organisations (Requirement; Compliance); CASA delegate issues and enforces the AD (delegate signature).","Requires certified maintenance capability and parts availability to perform removal, blanking, loom repair and protection (implied by Requirement and SB)."],"plain_english_summary":"Requires removal of the fuel cross‑feed drain stub pipes from port and starboard wing dry bays and installation of blanking caps, and inspection/repair/protection of electrical cable looms where chafe is found. Applies to all HS 748 series aircraft; operators must follow BAe Systems Service Bulletin HS 748‑28‑045 by the stated deadlines (remove by 12 Feb 2004; inspect before next flight). Purpose: reduce fire risk from cable chafing. Operators pay for and arrange the work; CASA enforces compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific identified hazard (fire risk from chafing electrical cables near fuel drains). The scope remains precisely limited to the HS 748 aircraft series and the specific wing components identified in the incident report. No scope creep is evident."},"complexity_factors":["Single aircraft type applicability with no exceptions or conditional logic","Only two straightforward requirements with clear sequential ordering","Zero defined terms in an interpretation section","No cross-references to other legislation or regulations beyond the enabling subregulation","Simple compliance dates with no tiered or flight-hour-based thresholds","Background narrative is descriptive rather than creating legal conditions"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires owners/operators of British Aerospace HS 748 aircraft to remove fuel cross‑feed drain stub pipes and brackets from both wing dry bays and seal the openings, and to inspect the electrical cable bundles in those bays for chafing. Any damaged wiring must be replaced, secured and protected.\n\nAction must be completed by 12 February 2004, with the wiring inspection and any repairs done before the aircraft next flies to prevent fuel‑related fire risk."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-748-32-port-and-starboard-wing-dry-bays-electrical-looms-and-fuel-cross-feed-drains","history":"/api/acts/ad-hs-748-32-port-and-starboard-wing-dry-bays-electrical-looms-and-fuel-cross-feed-drains/history","analysis":"/api/acts/ad-hs-748-32-port-and-starboard-wing-dry-bays-electrical-looms-and-fuel-cross-feed-drains/analysis","conflicts":"/api/acts/ad-hs-748-32-port-and-starboard-wing-dry-bays-electrical-looms-and-fuel-cross-feed-drains/conflicts","importantCases":"/api/acts/ad-hs-748-32-port-and-starboard-wing-dry-bays-electrical-looms-and-fuel-cross-feed-drains/important-cases","documents":"/api/acts/ad-hs-748-32-port-and-starboard-wing-dry-bays-electrical-looms-and-fuel-cross-feed-drains/documents"}}