{"id":"F2006B05678","name":"AD/PA-30/4 - Auto-Pilot Pitch Servo Motor - Modification","slug":"ad-pa-30-4-auto-pilot-pitch-servo-motor-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135429,"registerId":"commonwealth-F2006B05678-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-30/4 - Auto-Pilot Pitch Servo Motor - 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-30 & 39 (Twin Comanche) Series Aeroplanes\n\n \n\nAD/PA-30/4 Auto-Pilot Pitch Servo Motor - Modification 7/65\n\nApplicability: All models fitted with Mitchell Altimatic 2 Auto-Pilot. Document: 1. Piper SB No. 224; and\n\n2. Mitchell SB No. A55. Compliance: Forthwith.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The supplied text sets an explicit applicability (all models fitted with Mitchell Altimatic 2), references two service bulletins for the modification, and requires compliance forthwith. The instrument as supplied does not indicate any change from a prior or original scope; no amendment history or differing scope is included in the provided text."},"complexity_factors":["Narrow and specific applicability (only PA‑30 & PA‑39 models fitted with Mitchell Altimatic 2) (Applicability).","Directive delegates all technical steps to two external service bulletins rather than containing procedural detail itself (Documents).","Immediate timing term (\"Forthwith\") without a staged compliance schedule increases urgency but keeps legal text short (Compliance).","Absence of cost allocation, certification or record‑keeping detail in the supplied text increases reliance on external documents and implementers' judgement.","Technical nature of the work implies need for specialised maintenance action, but the AD text itself contains no technical instructions or qualification requirements."],"plain_english_summary":"This AD mandates an immediate modification of the auto‑pilot pitch‑servo motor on Piper PA‑30 and PA‑39 aircraft fitted with the Mitchell Altimatic 2. Affected owners/operators and maintenance organisations must comply \"Forthwith\" by following the technical instructions in Piper Service Bulletin No. 224 and Mitchell Service Bulletin No. A55. The AD itself delegates all technical detail to those service bulletins."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1965. It has not expanded beyond its original narrow purpose of addressing a specific auto-pilot servo motor issue in specific Piper aircraft models."},"complexity_factors":["Extremely short document (under 200 words)","No defined terms section","No cross-references to other legislation beyond the two named service bulletins","Simple conditional logic: only applies to specific aircraft model with specific equipment","Single compliance requirement with immediate effect","No exceptions, exemptions, or nested conditions"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires owners and operators of **Piper PA-30 and PA-39 Twin Comanche aircraft** to modify the **auto-pilot pitch servo motor** if their plane is fitted with a **Mitchell Altimatic 2 Auto-Pilot**.\n\n**Who it affects:** Anyone who owns, operates, or maintains these specific Piper twin-engine aircraft with that particular auto-pilot system installed.\n\n**What must be done:** The aircraft must be modified **\"forthwith\"** (immediately — without delay). The technical details of the modification are found in two service bulletins:\n- **Piper Service Bulletin No. 224**\n- **Mitchell Service Bulletin No. A55**\n\n**Why it matters:** Airworthiness Directives are legally binding safety instructions. If you don't comply, your aircraft is considered unairworthy — meaning you cannot legally fly it. This particular directive (dating from July 1965) addresses a specific safety issue with the auto-pilot system that could affect flight control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-30-4-auto-pilot-pitch-servo-motor-modification","history":"/api/acts/ad-pa-30-4-auto-pilot-pitch-servo-motor-modification/history","analysis":"/api/acts/ad-pa-30-4-auto-pilot-pitch-servo-motor-modification/analysis","conflicts":"/api/acts/ad-pa-30-4-auto-pilot-pitch-servo-motor-modification/conflicts","importantCases":"/api/acts/ad-pa-30-4-auto-pilot-pitch-servo-motor-modification/important-cases","documents":"/api/acts/ad-pa-30-4-auto-pilot-pitch-servo-motor-modification/documents"}}