{"id":"F2006B05432","name":"AD/PA-22/28 - Automatic Pilot Roll Servo Shear Pin - Installation","slug":"ad-pa-22-28-automatic-pilot-roll-servo-shear-pin-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46134,"registerId":"commonwealth-F2006B05432-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-22/28 - Automatic Pilot Roll Servo Shear Pin - Installation","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Piper PA-22 (Tri-Pacer and Colt) Series Aeroplanes\n\n \n\nAD/PA-22/28 Automatic Pilot Roll Servo Shear Pin - Installation 9/74\n\nApplicability: All models fitted with Edo-Aire Mitchell Automatic Pilot AK064. Document:  1. Piper SL No. 695; or\n\n2. Edo-Aire Mitchell SL ML 38.\n\n \n\nCompliance: Within 200 hours time in service after 30 September 1974.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2019},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive remains precisely targeted at the specific mechanical modification described in the title—installation of a shear pin for the autopilot roll servo. There is no evidence of scope expansion beyond this single safety-critical hardware installation."},"complexity_factors":["Extremely short text with no defined terms or interpretation section","Assumes technical knowledge of aviation terminology (e.g., 'roll servo', 'time in service')","Delegates all substantive requirements to external technical documents (Service Letters) not reproduced in the directive"],"plain_english_summary":"This **Airworthiness Directive** (a mandatory safety order with legal force) requires owners of specific Piper aircraft to install a safety device in the automatic pilot system.\n\n**Who it affects**\nOwners and operators of Piper PA-22 \"Tri-Pacer\" and \"Colt\" aircraft fitted with the Edo-Aire Mitchell Automatic Pilot model AK064.\n\n**What you must do**\nInstall a shear pin in the autopilot's roll servo mechanism. You must follow the technical instructions in either:\n* Piper Service Letter No. 695, **or**\n* Edo-Aire Mitchell Service Letter ML 38\n\n**Deadline**\nComplete the installation within 200 hours of flight time (\"time in service\") after 30 September 1974.\n\n**Why it matters**\nThe shear pin acts as a mechanical safety break. If the autopilot's roll servo jams or fails, the shear pin breaks away to prevent the autopilot from locking the flight controls, allowing the pilot to retain manual control of the aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-22-28-automatic-pilot-roll-servo-shear-pin-installation","history":"/api/acts/ad-pa-22-28-automatic-pilot-roll-servo-shear-pin-installation/history","analysis":"/api/acts/ad-pa-22-28-automatic-pilot-roll-servo-shear-pin-installation/analysis","conflicts":"/api/acts/ad-pa-22-28-automatic-pilot-roll-servo-shear-pin-installation/conflicts","importantCases":"/api/acts/ad-pa-22-28-automatic-pilot-roll-servo-shear-pin-installation/important-cases","documents":"/api/acts/ad-pa-22-28-automatic-pilot-roll-servo-shear-pin-installation/documents"}}