{"id":"F2006B10432","name":"AD/HS 125/151 Amdt 1 - APU Fuel Feed Hose Assemblies","slug":"ad-hs-125-151-amdt-1-apu-fuel-feed-hose-assemblies","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116127,"registerId":"commonwealth-F2006B10432-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/151 Amdt 1 - APU Fuel Feed Hose Assemblies","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)  \nBritish Aerospace BAe 125 Series Aeroplanes\n\nAD/HS 125/151\n\nAmdt 1\n\n  \nAPU Fuel Feed Hose Assemblies 13/96\n\nApplicability: All BAe 125 series 1000A, 1000B and Hawker 1000 aircraft Post Mod 259722C (Introduction of Turbomach APU).\n\nRequirement 1. Inspect the APU fuel feed hose assembly, in accordance with Hawker Raytheon Corporate Jets Mandatory Inspection Service Bulletin SB 49-44 Revision 1.\n\nNote: CAA (UK) AD 004-01-95 and FAA AD 95-10-01 refer.\n\n2. Replace the vinyl conduit on the APU fuel feed hose assembly with convoluted PTFE tube, in accordance with Hawker Service Bulletin SB.49-47-25A825A (Modification No. 25A825A).\n\nCompliance: Requirement 1: Unless previously accomplished, with an effective date of 31 May 1995 and thereafter at the periods specified in the manufacturers maintenance schedules.\n\nRequirement 2: Within 200 flight hours with an effective date of 5 December 1995.\n\nCompliance with Requirement 2 provides terminating action for the inspections in Requirement 1.\n\nThis Amendment is effective from 5 December 1996.\n\nBackground: The aircraft manufacturer has advised that APU feed hoses have sustained heat damage due to impingement of hot bleed air leaking from adjacent pneumatic components.\n\nComplete failure of the APU hoses could result in an in-flight fire.\n\nThis amendment is raised to provide terminating action to the Directive.\n\nThe original issue of this Airworthiness Directive became effective on 31 May 1995.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is an amendment to an existing Airworthiness Directive. The original AD required ongoing inspections; this amendment adds a permanent fix (the hose replacement) that allows operators to stop doing the inspections. The scope remains tightly focused on the specific APU fuel hose safety issue and has not expanded beyond this original safety purpose."},"complexity_factors":["Very short document (under 300 words)","Only 2 substantive requirements with clear compliance dates","Minimal defined terms (only standard aviation abbreviations like APU, PTFE)","No nested conditional logic or cross-references to other legislation","Simple structure: applicability → requirements → compliance → background","Refers to external technical documents (Service Bulletins) but does not incorporate their content"],"plain_english_summary":"This Civil Aviation Safety Authority Airworthiness Directive orders inspections and a mandatory retrofit for BAe 125 Series 1000A/1000B and Hawker 1000 jets equipped with the Turbomach APU. Operators must inspect APU fuel hoses and replace their vinyl protective covering with heat‑resistant convoluted PTFE within the specified compliance window. The measure prevents heat‑damage to fuel hoses and eliminates the risk of in‑flight fire; inspections cease once the retrofit is completed."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The original AD required inspections; this amendment adds a mandatory modification (replace vinyl conduit with PTFE) within a 200‑flight‑hour window and makes that modification the terminating action for inspections. Applicability to the same aircraft models and post‑mod status is retained; the amendment increases the compliance obligation from inspection-only to a required hardware change."},"complexity_factors":["Model- and mod-status-specific applicability (BAe 125 series 1000A/1000B and Hawker 1000, post Mod 259722C)","Two-step compliance structure: recurring inspections until a terminating modification is completed","Multiple documentary references (Hawker Raytheon Mandatory Inspection SB 49-44 Rev 1; Hawker Service Bulletin SB.49-47-25A825A) and cross-reference to UK and FAA ADs","Specific timing requirements (effective dates plus a 200 flight‑hour window for modification)","Technical maintenance action (hose assembly inspection and material replacement) requiring certified maintenance capability","Ongoing administrative burden: scheduling, performing repeated inspections per manufacturer maintenance schedule, and recording proof of terminating modification"],"plain_english_summary":"This Directive requires operators of BAe 125 Series 1000A/1000B and Hawker 1000 aircraft (post Mod 259722C) to inspect the APU fuel feed hose assembly and to replace the vinyl conduit with convoluted PTFE tubing in line with the manufacturer’s service bulletins. Replacement within 200 flight hours ends the recurring inspection requirement.\n\nOperators pay for and schedule the inspections and modification and must record compliance. The stated safety aim is to prevent heat damage from leaking bleed air that could lead to an in‑flight fire."},"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-125-151-amdt-1-apu-fuel-feed-hose-assemblies","history":"/api/acts/ad-hs-125-151-amdt-1-apu-fuel-feed-hose-assemblies/history","analysis":"/api/acts/ad-hs-125-151-amdt-1-apu-fuel-feed-hose-assemblies/analysis","conflicts":"/api/acts/ad-hs-125-151-amdt-1-apu-fuel-feed-hose-assemblies/conflicts","importantCases":"/api/acts/ad-hs-125-151-amdt-1-apu-fuel-feed-hose-assemblies/important-cases","documents":"/api/acts/ad-hs-125-151-amdt-1-apu-fuel-feed-hose-assemblies/documents"}}