{"id":"F2009L02248","name":"AD/APU/23 - Saphir 2 Exhaust Thermal Insulation","slug":"ad-apu-23-saphir-2-exhaust-thermal-insulation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":162073,"registerId":"commonwealth-F2009L02248-current","compilationNumber":null,"startDate":"2026-04-04","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Auxiliary Power Units","sectionType":"division","heading":"Auxiliary Power Units","content":"### Auxiliary Power Units\n\n| AD/APU/23 | Saphir 2 Exhaust Thermal Insulation | 7/2009 |\n| --------- | ----------------------------------- | ------ |\n\n| Applicability: | Microturbo SA Saphir 2 Model 016 Auxiliary Power Units (APUs) on which the exhaust thermal insulation has been replaced since 1 January 1995.Note 1: These APUs are known to be installed on, but are not limited to, Dassault Falcon 20 aeroplanes.                                                                                                                                                                                                                                                                                                                                                                                                                      |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Inspect the exhaust thermal insulation for signs of deterioration.2. Repeat the inspection detailed in Requirement 1 of this AD.3. If deterioration is detected, replace the exhaust thermal insulation in accordance with the accomplishment instructions in Microturbo Alert Service Bulletin49-11A76 Revision 1, dated 6 September 2007.4. Replace the exhaust thermal insulation in accordance with the accomplishment instructions in Microturbo Alert Service Bulletin 49-11A76 Revision 1.The use of later approved revisions of this document is acceptable for compliance with the requirements of this AD.Note 2: EASA AD 2009-0100 dated 4 May 2009 refers. |\n| Compliance:    | For Requirement 1 - Within 10 APU operating hours from the effective date of this AD.For Requirement 2 - At intervals not exceeding 10 APU operating hours.For Requirement 3 - Before operating the APU again.For Requirement 4 - Within 50 APU operating hours from the effective date of this AD.                                                                                                                                                                                                                                                                                                                                                                       |\n|                | This Airworthiness Directive becomes effective on 2 July 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| Background:    | Due to a lapse in manufacturing quality control, the exhaust thermal insulation of certain Microturbo SA Saphir 2 Model 016 APUs may not meet the approved design standard, and may fail in service. The affected part numbers are 016-33-01 (Inner Thermal Insulation), 016-33-02 (Outer Thermal Insulation) and 016-33-03 (EGT Sensor Thermal Insulation). Only parts replaced since 1995 are affected.                                                                                                                                                                                                                                                                 |\n\n|     | This condition, if not corrected, could result in rapid deterioration and physical breakdown of the exhaust thermal insulation, leading to loss of insulation efficiency and ultimately exposure of the hot APU exhaust section and risk of fire. |\n| --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n22 May 2009","sortOrder":0},{"sectionNumber":"AD/APU/23","sectionType":"part","heading":"AD/APU/23","content":"## AD/APU/23","sortOrder":1},{"sectionNumber":"Saphir 2 Exhaust Thermal Insulation","sectionType":"part","heading":"Saphir 2 Exhaust Thermal Insulation","content":"## Saphir 2 Exhaust Thermal Insulation","sortOrder":2},{"sectionNumber":"7/2009","sectionType":"part","heading":"7/2009","content":"## 7/2009","sortOrder":3}],"analysis":{"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":false,"description":"This is a standard, narrowly-scoped Airworthiness Directive targeting a specific safety defect in a specific aircraft component. The scope remains tightly focused on the exhaust thermal insulation issue for Saphir 2 Model 016 APUs as originally intended. There is no evidence of scope creep or expansion beyond the original safety purpose."},"complexity_factors":["Very short document (approximately 300 words of substantive content)","Only 4 specific requirements with clear, numbered compliance deadlines","Single defined term (APU - Auxiliary Power Unit) explained in context","No cross-references to other legislation or complex conditional logic","Straightforward applicability criteria based on date and part number","Single external reference to manufacturer's service bulletin (Microturbo Alert Service Bulletin 49-11A76)","Linear structure: Background → Applicability → Requirements → Compliance → Effective date"],"plain_english_summary":"This CASA Airworthiness Directive orders owners/operators of aircraft fitted with Microturbo SA Saphir 2 Model 016 APUs (commonly Dassault Falcon 20s) to address known defective replacement exhaust thermal insulation installed since 1 Jan 1995. Inspections are required immediately and regularly, with deteriorated parts to be replaced and all affected insulation replaced within a short operating-hour window. The aim is to eliminate insulation failure that can expose hot exhaust parts and create a fire risk."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope remains targeted to Saphir 2 Model 016 APUs with exhaust thermal insulation replaced since 1 January 1995 and the listed part numbers. The AD does not expand coverage beyond those affected parts or introduce additional categories of equipment; it prescribes inspections and replacement per the cited service bulletin (Applicability; Background; Requirement)."},"complexity_factors":["Narrow applicability limited to Saphir 2 Model 016 APUs with exhaust insulation replaced since 1 January 1995 (Applicability; Background)","Multiple, time‑bound actions: immediate inspection, repeat inspections at ≤10 APU hours, replacement before next operation if deterioration found, and mandatory replacement within 50 APU hours (Requirement; Compliance)","Dependence on an external technical document (Microturbo Alert Service Bulletin 49-11A76 Rev 1) for the approved method of replacement and allowance for later approved revisions (Requirement)","Specific affected part numbers identified (016-33-01, 016-33-02, 016-33-03), which narrows scope but requires parts identification checks (Background)","Safety‑critical consequence (risk of fire) meaning low tolerance for non‑compliance and potential operational disruption (Background)","Cross-reference to EASA AD 2009-0100, requiring coordination with foreign authority guidance (Requirement Note)","Short compliance windows (10 APU hours) create scheduling and operational burdens for operators (Compliance)"],"plain_english_summary":"Requires operators of Microturbo Saphir 2 Model 016 APUs whose exhaust thermal insulation was replaced since 1 January 1995 to carry out immediate and repeated inspections and to replace deteriorated insulation following Microturbo Alert Service Bulletin 49-11A76 Rev 1 (Requirements; Compliance). The rule responds to a manufacturing lapse that may cause insulation breakdown and fire risk; operators pay for inspections and replacements, must schedule short 10‑APU‑hour checks, and follow the manufacturer’s installation instructions (Background; Compliance)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-apu-23-saphir-2-exhaust-thermal-insulation","history":"/api/acts/ad-apu-23-saphir-2-exhaust-thermal-insulation/history","analysis":"/api/acts/ad-apu-23-saphir-2-exhaust-thermal-insulation/analysis","conflicts":"/api/acts/ad-apu-23-saphir-2-exhaust-thermal-insulation/conflicts","importantCases":"/api/acts/ad-apu-23-saphir-2-exhaust-thermal-insulation/important-cases","documents":"/api/acts/ad-apu-23-saphir-2-exhaust-thermal-insulation/documents"}}