{"id":"F2006B05668","name":"AD/PA-30/27 - Automatic Pilot Roll Servo Shear Pin - Installation","slug":"ad-pa-30-27-automatic-pilot-roll-servo-shear-pin-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135394,"registerId":"commonwealth-F2006B05668-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-30/27 - Automatic Pilot Roll Servo Shear Pin -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-30 & 39 (Twin Comanche) Series Aeroplanes\n\n \n\nAD/PA-30/27 Automatic Pilot Roll Servo Shear Pin - Installation\n\n\n9/74\n\n \n\nApplicability: All model PA-30 aeroplanes fitted with Edo-Aire Mitchell Automatic Pilot AK089, AK-89R.\n\n \n\nDocument: 1. Piper SL No. 695; or\n\n \n\n2. Edo-Aire Mitchell SL ML38.\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","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1923},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive remains tightly focused on its original technical safety purpose: mandating a specific mechanical modification for a narrowly defined subset of Piper PA-30 aircraft with particular autopilot installations. No evidence of scope expansion beyond the initial safety requirement."},"complexity_factors":["Very short, single-purpose directive with clearly defined applicability","Requires cross-reference to external technical service letters for implementation details","Uses specific aviation technical terminology (roll servo, shear pin, time in service)"],"plain_english_summary":"**What this is:** A safety directive requiring owners of specific Piper Twin Comanche aircraft to install a protective device (called a shear pin) in the automatic pilot (autopilot) system.\n\n**Who it affects:** Owners and operators of Piper PA-30 aeroplanes fitted with Edo-Aire Mitchell autopilot models AK089 or AK-89R.\n\n**What you must do:** Install a shear pin in the autopilot's roll servo mechanism. A shear pin is a safety device designed to break under excessive strain, preventing damage to the control system.\n\n**How to comply:** Follow the technical instructions in either:\n* Piper Service Letter No. 695; **or**\n* Edo-Aire Mitchell Service Letter ML38\n\n**Deadline:** Complete the installation within 200 hours of flight time after 30 September 1974.\n\n**Why it matters:** This modification prevents potential autopilot failures that could compromise aircraft control during flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-30-27-automatic-pilot-roll-servo-shear-pin-installation","history":"/api/acts/ad-pa-30-27-automatic-pilot-roll-servo-shear-pin-installation/history","analysis":"/api/acts/ad-pa-30-27-automatic-pilot-roll-servo-shear-pin-installation/analysis","conflicts":"/api/acts/ad-pa-30-27-automatic-pilot-roll-servo-shear-pin-installation/conflicts","importantCases":"/api/acts/ad-pa-30-27-automatic-pilot-roll-servo-shear-pin-installation/important-cases","documents":"/api/acts/ad-pa-30-27-automatic-pilot-roll-servo-shear-pin-installation/documents"}}