{"id":"F2006B05520","name":"AD/PA-24/18 - Automatic Pilot - Pitch Servomotor - Modification","slug":"ad-pa-24-18-automatic-pilot-pitch-servomotor-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46391,"registerId":"commonwealth-F2006B05520-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-24/18 - Automatic Pilot - Pitch Servomotor - Modification","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-24 (Comanche) Series Aeroplanes\n\n \n\nAD/PA-24/18 Automatic Pilot - Pitch Servomotor - Modification 7/65\n\nApplicability: Models PA-24-250, PA-24-260 and PA-24-400 equipped with a Mitchell Altimatic Autopilot.\n\n \n\nDocument: Piper SB No. 224; and\n\n \n\nMitchell SB No. A55.\n\n \n\nCompliance: Forthwith.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1733},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive remains narrowly focused on its original safety purpose: correcting a specific defect in the pitch servomotor of Mitchell Altimatic Autopilots installed in specified Piper Comanche models. There is no evidence of scope creep or expansion into unrelated aircraft systems."},"complexity_factors":["Extremely brief text (under 100 words of operative provisions)","Single compliance action with no exceptions or alternative methods stated","Technical specifications contained entirely in referenced external documents (service bulletins)","Binary applicability test (specific model + specific equipment installed)"],"plain_english_summary":"**What this is:** A mandatory safety order (called an Airworthiness Directive) requiring owners of specific Piper aircraft to fix a problem with their autopilot systems.\n\n**Who it affects:** Owners and operators of Piper PA-24-250, PA-24-260, and PA-24-400 aircraft (known as Comanche models) that are equipped with a Mitchell Altimatic Autopilot.\n\n**What you must do:** Modify the **pitch servomotor** — this is the part of the autopilot that physically moves the aircraft's controls to climb or descend. You must carry out the modification exactly as described in two technical documents: Piper Service Bulletin No. 224 and Mitchell Service Bulletin No. A55.\n\n**When:** Immediately. The directive uses the term \"**Forthwith**,\" which means compliance is required without delay as soon as the directive applies to your aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-24-18-automatic-pilot-pitch-servomotor-modification","history":"/api/acts/ad-pa-24-18-automatic-pilot-pitch-servomotor-modification/history","analysis":"/api/acts/ad-pa-24-18-automatic-pilot-pitch-servomotor-modification/analysis","conflicts":"/api/acts/ad-pa-24-18-automatic-pilot-pitch-servomotor-modification/conflicts","importantCases":"/api/acts/ad-pa-24-18-automatic-pilot-pitch-servomotor-modification/important-cases","documents":"/api/acts/ad-pa-24-18-automatic-pilot-pitch-servomotor-modification/documents"}}