{"id":"F2006B06307","name":"AD/PORSCHE/4 - Drive Shaft Teeth","slug":"ad-porsche-4-drive-shaft-teeth","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47419,"registerId":"commonwealth-F2006B06307-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](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\nPorsche Piston Engines","sortOrder":0},{"sectionNumber":"AD/PORSCHE/4 Drive Shaft Teeth 7/2003","sectionType":"part","heading":"AD/PORSCHE/4 Drive Shaft Teeth 7/2003","content":"# AD/PORSCHE/4 Drive Shaft Teeth 7/2003\n\nApplicability: Porsche AG PFM 3200 N01 and N03 engines.\n\nRequirement: 1. Carry out an inspection of the drive shaft teeth in accordance with Porsche Service Bulletin (S/B) N/300-038 Revision 1.\n\n    2. Repeat the inspection of the drive shaft teeth in accordance with Porsche Service Bulletin (S/B) N/300-038 Revision 1.\n\n    3. Replace the drive shaft if the area of pitting is larger than 4mm2 for 1 drive tooth, or 38 mm2 total for all drive shaft teeth, or if between inspections the growth of pitting exceeds more than 2 mm2 for any 1 tooth.\n    4. Defects found to during the inspections detailed in this Directive must be reported to the manufacturer.\n\nNote: LBA AD 2003-020/2 refers.\n\n| Compliance: | 1.  | For gearboxes with a Time Since Overhaul:                                                                             |\n| ----------- | --- | --------------------------------------------------------------------------------------------------------------------- |\n|             |     | a. between 900-1200 flight hours; At the next 100 hour inspection of the                                              |\n|             |     | engine.                                                                                                               |\n|             |     | b. over 1200 flight hours; Before the next flight. (A ferry flight to allow maintenance to be carried out is allowed) |\n|             | 2.  | At intervals not to exceed 200 flight hours from the initial inspection.                                              |\n|             | 3.  | Before further flight.                                                                                                |\n|             | 4.  | Within 30 days of the inspection.                                                                                     |\n\nThis Airworthiness Directive becomes effective on 10 July 2003.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The AD's scope is limited to Porsche AG PFM 3200 N01 and N03 engines and prescribes inspections, numeric replacement criteria, and reporting. Nothing in the text expands applicability beyond those engines or adds obligations outside inspection/replacement/reporting. The measures are consistent with addressing the stated unsafe condition (Applicability; Requirements 1–4; Compliance)."},"complexity_factors":["Numeric damage thresholds and growth criteria for mandatory replacement (single-tooth 4 mm2, total 38 mm2, growth >2 mm2) (Requirement 3)","Mandatory inspection procedure is externalised to Porsche Service Bulletin N/300-038 Revision 1 rather than fully specified in the AD (Requirements 1–2)","Conditional initial compliance timing tied to engine Time Since Overhaul with multiple branches (900–1200 hrs: next 100‑hr inspection; >1200 hrs: before next flight; ferry flight allowed) (Compliance 1)","Fixed repetitive inspection interval (every 200 flight hours) imposing ongoing maintenance burden (Compliance 2)","Immediate action required where thresholds exceeded: replacement before further flight (Compliance 3)","Reporting obligation to manufacturer within 30 days increases administrative compliance (Requirement 4; Compliance 4)","Applicability limited to specific engine models reduces scope but concentrates compliance on a narrow operator group (Applicability)","Regulatory basis and issuing authority are explicitly stated (CASR subreg 39.1(1) and CASA delegate), which creates enforceability and limited administrative discretion (preamble)","Cross-reference to foreign AD (LBA AD 2003-020/2) for traceability may require operators to consult multiple documents (Note)"],"plain_english_summary":"This Airworthiness Directive requires operators of Porsche AG PFM 3200 N01 and N03 engines to inspect drive-shaft teeth using Porsche Service Bulletin N/300-038 Rev 1, replace shafts when pitting exceeds specified numeric limits, and report defects to the manufacturer. CASA issued the AD under CASR subreg 39.1(1) to correct an unsafe condition; it sets initial timing based on time‑since‑overhaul, mandates 200‑hour repeat inspections, requires removal before further flight if limits are exceeded, and requires defect reports within 30 days."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive maintaining its original purpose: mandating specific inspections and replacements to address a known unsafe condition in particular engine models. No scope creep detected."},"complexity_factors":["Short, single-purpose directive with clear mechanical trigger (pitting measurements in mm²)","Only 4 defined compliance categories with straightforward time-since-overhaul thresholds","Single cross-reference to German aviation authority (LBA) directive and one Porsche Service Bulletin","No nested exceptions or conditional logic beyond the three-tier compliance timeline","Quantified replacement criteria (4mm² single tooth, 38mm² total, 2mm² growth) provide objective standards"],"plain_english_summary":"This CASA safety order mandates inspection of the drive‑shaft teeth on Porsche PFM 3200 N01/N03 aircraft engines for pitting, with repeat checks every 200 flight hours, required replacement if pits exceed set limits, and reporting defects to Porsche within 30 days.  \n\nIt affects owners, operators and maintenance engineers; high‑time engines need immediate attention (900–1,200 hrs at next 100‑hr check; >1,200 hrs grounded until inspected)."},"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-porsche-4-drive-shaft-teeth","history":"/api/acts/ad-porsche-4-drive-shaft-teeth/history","analysis":"/api/acts/ad-porsche-4-drive-shaft-teeth/analysis","conflicts":"/api/acts/ad-porsche-4-drive-shaft-teeth/conflicts","importantCases":"/api/acts/ad-porsche-4-drive-shaft-teeth/important-cases","documents":"/api/acts/ad-porsche-4-drive-shaft-teeth/documents"}}