{"id":"F2006B03923","name":"AD/BEECH 400/20 - Bleed Air Supply Tube Assembly","slug":"ad-beech-400-20-bleed-air-supply-tube-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43532,"registerId":"commonwealth-F2006B03923-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \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 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\nBeechcraft 400 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/BEECH 400/20 Bleed Air Supply Tube As","sectionType":"part","heading":"AD/BEECH 400/20 Bleed Air Supply Tube Assembly 9/2001","content":"# AD/BEECH 400/20 Bleed Air Supply Tube Assembly 9/2001\n\nApplicability: Model 400A aeroplanes.\n\nRequirement: Visually inspect the bleed air supply tube assemblies for broken wire braiding on the bellows assemblies or for ruptured or leaking bellows assemblies. The bleed air supply tubes are located within the aft fuselage and connect with mating ducting in the pylon area on the right and left side of the aircraft.\n\nIf any braiding wires are broken or if any bellows assembly is found to be leaking replace the defective duct with a serviceable duct before further flight.\n\nNote 1: FAA AD 2001-03-06 refers.\n\nNote 2: Compliance with the relevant procedures specified in Chapter 4, “Airworthiness Limitations” in the Raytheon Beechjet 400/400A Maintenance Manual, Revision B26, satisfies the intent of this Directive.\n\nCompliance: Unless previously accomplished, within 200 flight hours from the effective date of this Airworthiness Directive and thereafter at intervals not to exceed 400 flight hours.\n\nThis Airworthiness Directive becomes effective on 6 September 2001.\n\nBackground: This Directive is prompted by advice that failure of the engine bleed air supply tube can occur resulting in high temperature bleed air impinging on surrounding structure, wiring and components.\n\n![Signature: Eugene Paul Holzapfel](image.002.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 27 July 2001\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 15 August 2001.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Scope aligns with the directive's stated intent: it mandates inspections and replacement of identified defective bleed air supply tube assemblies on Model 400A aeroplanes within specified intervals, and refers to an FAA AD and the manufacturer maintenance manual for procedures. The instrument does not expand obligations beyond those specified."},"complexity_factors":["Narrow applicability: limited to Model 400A aeroplanes (Applicability).","Simple required action: visual inspection and replacement of defective ducts (Requirement).","Clear compliance timing: initial within 200 flight hours, recurring at intervals ≤ 400 hours (Compliance).","References to external documents: FAA AD 2001-03-06 and Raytheon Beechjet 400/400A Maintenance Manual, Revision B26 (Note 1 & Note 2), which operators must consult.","Enforcement/legal basis: issued under subregulation 39.1(1) of CAR 1998 (preamble), giving CASA delegate authority.","Limited operational discretion: determination of 'serviceable duct' and visual assessment may require technical judgement by maintenance personnel.","Direct cost burden on operators for inspections, parts and possible downtime (Requirement & Compliance)."],"plain_english_summary":"Requires operators of Beechcraft 400A aeroplanes to visually inspect the aft fuselage bleed air supply tube assemblies for broken wire braiding or leaking/ruptured bellows and to replace any defective duct before further flight. Inspections must be done within 200 flight hours and repeated at intervals not exceeding 400 flight hours. The directive addresses risk of high‑temperature bleed air impinging on structure, wiring and components; operators bear inspection and replacement costs and must follow the Raytheon maintenance manual or the referenced FAA AD."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific unsafe condition in a specific aircraft model's bleed air system. No evidence of scope creep beyond the original safety purpose."},"complexity_factors":["Single aircraft model applicability (Model 400A only)","One primary requirement with straightforward conditional action (inspect; replace if defective)","Simple compliance timeline (200 hours initial, 400 hours recurring)","Minimal cross-referencing (one FAA AD reference, one maintenance manual alternative compliance path)","No defined terms section or complex interpretive provisions","Total length: approximately 250 words of substantive text"],"plain_english_summary":"This AD requires owners/operators of Beechcraft 400A jets to inspect rear-fuselage bleed air supply tube assemblies for broken wire braiding or leaks/ruptures in the flexible bellows, and to replace any defective tube before next flight. It affects aircraft owners/operators and maintenance engineers and matters because failed tubes can release extremely hot air, risking fire and structural or systems loss. Initial and repeat inspection intervals are specified."},"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-beech-400-20-bleed-air-supply-tube-assembly","history":"/api/acts/ad-beech-400-20-bleed-air-supply-tube-assembly/history","analysis":"/api/acts/ad-beech-400-20-bleed-air-supply-tube-assembly/analysis","conflicts":"/api/acts/ad-beech-400-20-bleed-air-supply-tube-assembly/conflicts","importantCases":"/api/acts/ad-beech-400-20-bleed-air-supply-tube-assembly/important-cases","documents":"/api/acts/ad-beech-400-20-bleed-air-supply-tube-assembly/documents"}}