{"id":"F2006B08302","name":"AD/CESSNA 400/15 Amdt 2 - Turbocharger Heat Shield","slug":"ad-cessna-400-15-amdt-2-turbocharger-heat-shield","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115693,"registerId":"commonwealth-F2006B08302-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 400/15 Amdt 2 - Turbocharger Heat Shield","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)  \nCessna 400 Series Aeroplanes\n\nAD/CESSNA 400/15\n\nAmdt 2\n\n  \nTurbocharger Heat Shield 3/97\n\nApplicability: All Cessna Model 401, 401A, 401B, 402, 402A and 402B aircraft fitted with Teledyne Continental Motors (TCM) TSIO-520-E engines and not incorporating steel turbocharger heat shields as detailed in Cessna Service Letter ME72-4.\n\nRequirement: To detect impending failure of the turbocharger turbine housings; remove both engine top cowls and turbocharger turbine housing insulation blankets and visually inspect the complete surface of the turbine housing of the TCM turbocharger assemblies P/N 632729 (AID P/N 406610) for evidence of cracks, bulges and burnt areas.\n\nReplace parts found to have evidence of cracks, bulges and burnt areas before further flight.\n\nNote 1: FAA Airworthiness Directive 70-03-04R1 refers.\n\nNote 2: This directive is only applicable to aircraft not incorporating the steel heat shields. Whilst Cessna has advised the parts required to fit steel heat shields are no longer available, the FAA has suggested the use of serviceable salvaged parts. CASA concurs with the FAA advice.\n\nCompliance: Effective 27 February 1997; prior to exceeding 400 hours turbocharger time in service from new or from overhaul, and thereafter at intervals not to exceed 120 hours time in service.\n\nThis Amendment becomes effective on 27 February 1997.\n\nBackground: This directive was originally issued to require the inspection of certain turbocharger turbine housings. Amendment 1 of this directive reflected the availability of a steel heat shield in lieu of the insulation blanket and clarified the inspection requirements. This amendment introduces a terminating action. The requirements of this directive are not applicable to an aircraft incorporating steel heat shields on both engines.\n\nAmendment 1 of this Airworthiness Directive became effective on 31 August 1987\\. The original issue of this Airworthiness Directive became effective on\n\n15 September 1971.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"The directive narrows applicability compared with the original requirement by introducing a terminating action: aircraft that incorporate steel turbocharger heat shields on both engines are exempt from the inspection/replacement requirements. The amendment also notes that new steel heat shield parts are no longer available and relies on salvaged parts per FAA/CASA guidance, which affects how operators can obtain the exempting modification."},"complexity_factors":["Applicability limited to specific airframe models and a single engine type (TCM TSIO‑520‑E)","Identified part number (turbocharger housing P/N 632729) must be inspected","Access requirement: removal of both engine top cowls and insulation blankets to inspect","Outcome-based visual criteria (cracks, bulges, burnt areas) require judgment by inspector","Compliance timing: initial inspection before 400 hours turbocharger time and recurrent 120‑hour intervals","Terminating action/exemption for aircraft with steel heat shields on both engines","Parts availability constraint: steel shield parts reportedly no longer produced; salvaged parts suggested by FAA and accepted by CASA","Historical amendments and cross-reference to FAA AD introduce coordination and record‑keeping considerations"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Cessna 401/401A/401B/402/402A/402B aeroplanes fitted with Teledyne Continental TSIO‑520‑E engines (and not fitted with steel turbocharger heat shields) to remove top cowls and insulation blankets and visually inspect turbocharger turbine housings (P/N 632729) for cracks, bulges or burnt areas and replace defective parts before further flight.\n\nInspections are required before exceeding 400 hours turbocharger time from new or overhaul and then every 120 hours; aircraft with steel heat shields on both engines are exempt."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"The original 1971 directive required ongoing inspections indefinitely. Amendment 1 (1987) added an alternative compliance path (steel heat shields). This Amendment 2 (1997) introduces a terminating action — allowing operators to permanently exit the inspection regime by installing steel heat shields on both engines. This narrows the ongoing scope by providing a permanent solution rather than indefinite recurring inspections."},"complexity_factors":["Single, specific applicability criteria (6 aircraft models, 1 engine type, exclusion for steel heat shields)","Straightforward inspection requirement with clear visual criteria (cracks, bulges, burnt areas)","Simple compliance timeline (400 hours initial, 120 hours recurring)","Minimal cross-referencing (one FAA directive reference, one Cessna service letter)","No nested conditional logic or defined terms section","Short document (approximately 250 words)"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Cessna 400-series airplanes with TCM TSIO‑520‑E turbocharged engines (without steel heat shields) to inspect the turbocharger turbine housing for cracks, bulges or burn damage, replace any defective parts, and follow the first inspection before 400 hours of turbocharger use and every 120 hours thereafter. \n\nIt prevents catastrophic engine damage or fire; installing steel heat shields on both engines is a terminating action (salvaged serviceable shields are acceptable)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-400-15-amdt-2-turbocharger-heat-shield","history":"/api/acts/ad-cessna-400-15-amdt-2-turbocharger-heat-shield/history","analysis":"/api/acts/ad-cessna-400-15-amdt-2-turbocharger-heat-shield/analysis","conflicts":"/api/acts/ad-cessna-400-15-amdt-2-turbocharger-heat-shield/conflicts","importantCases":"/api/acts/ad-cessna-400-15-amdt-2-turbocharger-heat-shield/important-cases","documents":"/api/acts/ad-cessna-400-15-amdt-2-turbocharger-heat-shield/documents"}}