{"id":"F2009L03935","name":"AD/PR/13 - Pitch Lock Assembly - Modification - CANCELLED","slug":"ad-pr-13-pitch-lock-assembly-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":81342,"registerId":"commonwealth-F2009L03935-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Propellers - Variable Pitch - Dowty Roto","sectionType":"division","heading":"Propellers - Variable Pitch - Dowty Rotol","content":"### Propellers - Variable Pitch - Dowty Rotol\n\n| AD/PR/13 | Pitch Lock Assembly - Modification | 12/2009 |\n| -------- | ---------------------------------- | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                           |\n| ------------ | ------------------------------------------------------------------------------------------------------------------------------------ |\n|              | This AD is cancelled on 19 November 2009.                                                                                            |\n| Background:  | This unique Australian AD specified a modification before installation in an aircraft after June 1971. The AD is no longer required. |\n\n![](image.001.png)\n\nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n30 September 2009","sortOrder":0},{"sectionNumber":"AD/PR/13","sectionType":"part","heading":"AD/PR/13","content":"## AD/PR/13","sortOrder":1},{"sectionNumber":"Pitch Lock Assembly - Modification","sectionType":"part","heading":"Pitch Lock Assembly - Modification","content":"## Pitch Lock Assembly - Modification","sortOrder":2},{"sectionNumber":"12/2009","sectionType":"part","heading":"12/2009","content":"## 12/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2278},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The document explicitly cancels a previous directive as its sole purpose; it does not expand scope or introduce new requirements beyond this termination."},"complexity_factors":["Single operative provision (cancellation only)","No definitions or interpretation section","No cross-references to other legislation required to understand effect","No conditional or nested logic","Extremely brief (under 50 words of substantive content)"],"plain_english_summary":"This document **cancels a previous aviation safety rule** about aircraft propellers.\n\nPreviously, Airworthiness Directive (AD) PR/13 required a specific modification to \"pitch lock assemblies\" (parts that control propeller blade angle) on Dowty Rotol variable pitch propellers before they could be installed in aircraft after June 1971.\n\n**What changes:** As of 19 November 2009, aircraft owners, operators, and mechanics **no longer need to perform this modification**. The Civil Aviation Safety Authority decided this safety requirement was no longer necessary, likely because the affected equipment is obsolete or the risk has been otherwise addressed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pr-13-pitch-lock-assembly-modification-cancelled","history":"/api/acts/ad-pr-13-pitch-lock-assembly-modification-cancelled/history","analysis":"/api/acts/ad-pr-13-pitch-lock-assembly-modification-cancelled/analysis","conflicts":"/api/acts/ad-pr-13-pitch-lock-assembly-modification-cancelled/conflicts","importantCases":"/api/acts/ad-pr-13-pitch-lock-assembly-modification-cancelled/important-cases","documents":"/api/acts/ad-pr-13-pitch-lock-assembly-modification-cancelled/documents"}}