{"id":"F2009L03429","name":"AD/TPE 331/4 - Propeller Pitch Control - Modification - CANCELLED","slug":"ad-tpe-331-4-propeller-pitch-control-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":141027,"registerId":"commonwealth-F2009L03429-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AlliedSignal (Garrett/AiResearch) Turbin","sectionType":"division","heading":"AlliedSignal (Garrett/AiResearch) Turbine Engines - TPE 331 Series","content":"### AlliedSignal (Garrett/AiResearch) Turbine Engines - TPE 331 Series\n\n| AD/TPE 331/4 | Propeller Pitch Control - Modification | 10/2009 |\n| ------------ | -------------------------------------- | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                                                                        |\n| ------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 24 September 2009.                                                                                                                                        |\n| Background:  | This unique Australian AD specified action in accordance with Airesearch SB No. 7. The AD was issued in 1967 and compliance was required forthwith. The AD is no longer required. |\n\n![](image.001.png)\n\nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n14 August 2009","sortOrder":0},{"sectionNumber":"AD/TPE 331/4","sectionType":"part","heading":"AD/TPE 331/4","content":"## AD/TPE 331/4","sortOrder":1},{"sectionNumber":"Propeller Pitch Control - Modification","sectionType":"part","heading":"Propeller Pitch Control - Modification","content":"## Propeller Pitch Control - Modification","sortOrder":2},{"sectionNumber":"10/2009","sectionType":"part","heading":"10/2009","content":"## 10/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2261},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument terminates the original 1967 mandate entirely rather than expanding its scope. It represents a complete removal of the regulatory requirement, not mission creep."},"complexity_factors":["Single operative provision (cancellation only)","No defined terms or interpretation section","No cross-references to other legislation","No conditional logic, exceptions, or procedural steps"],"plain_english_summary":"This document **cancels a 42-year-old aviation safety rule** that required owners of specific aircraft engines to modify their propeller pitch control systems.\n\n**What it does:**\n- Removes the mandatory requirement for owners of AlliedSignal (Garrett/AiResearch) TPE 331 series turbine engines to comply with a 1967 modification order\n- Stops requiring adherence to \"Airesearch Service Bulletin No. 7\" (the manufacturer's technical instructions)\n- Takes effect on 24 September 2009\n\n**Who it affects:**\n- Owners and operators of aircraft fitted with TPE 331 series engines (typically commuter aircraft and agricultural planes)\n\n**Why it matters:**\nThe original directive was issued in 1967 as an emergency measure requiring immediate modifications to prevent propeller control failures. After more than four decades, the Civil Aviation Safety Authority has determined this specific safety fix is no longer required—likely because the affected engines have been retired, redesigned, or the original safety risk has been eliminated through other means."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-4-propeller-pitch-control-modification-cancelled","history":"/api/acts/ad-tpe-331-4-propeller-pitch-control-modification-cancelled/history","analysis":"/api/acts/ad-tpe-331-4-propeller-pitch-control-modification-cancelled/analysis","conflicts":"/api/acts/ad-tpe-331-4-propeller-pitch-control-modification-cancelled/conflicts","importantCases":"/api/acts/ad-tpe-331-4-propeller-pitch-control-modification-cancelled/important-cases","documents":"/api/acts/ad-tpe-331-4-propeller-pitch-control-modification-cancelled/documents"}}