{"id":"F2008L03550","name":"AD/PA-24/18 - Automatic Pilot - Pitch Servomotor - Modification - CANCELLED","slug":"ad-pa-24-18-automatic-pilot-pitch-servomotor-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":120681,"registerId":"commonwealth-F2008L03550-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-24 (Comanche) Series Aeroplanes","sectionType":"division","heading":"Piper PA-24 (Comanche) Series Aeroplanes","content":"### Piper PA-24 (Comanche) Series Aeroplanes\n\n| AD/PA-24/18 | Automatic Pilot - Pitch Servomotor - Modification | 11/2008 |\n| ----------- | ------------------------------------------------- | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                       |\n| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n|              | This AD is cancelled on 23 October 2008.                                                                                                                                                                                                         |\n| Background:  | This unique Australian AD specified modification of the Mitchell Altimatic Autopilot in accordance with Piper SB No. 224 and Mitchell SB No. A55. The AD was issued in 1965 and compliance was required forthwith. The AD is no longer required. |\n\n![](image.001.png)\n\nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n26 August 2008","sortOrder":0},{"sectionNumber":"AD/PA-24/18","sectionType":"part","heading":"AD/PA-24/18","content":"## AD/PA-24/18","sortOrder":1},{"sectionNumber":"Automatic Pilot - Pitch Servomotor - Mod","sectionType":"part","heading":"Automatic Pilot - Pitch Servomotor - Modification","content":"## Automatic Pilot - Pitch Servomotor - Modification","sortOrder":2},{"sectionNumber":"11/2008","sectionType":"part","heading":"11/2008","content":"## 11/2008","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2071},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":true,"description":"The instrument has been completely cancelled, eliminating the mandatory autopilot modification requirement for affected aircraft. The scope has shifted from imposing an active safety obligation (1965-2008) to removing it entirely."},"complexity_factors":["Single operative provision consisting of the word 'CANCELLED'","No defined terms or interpretation section","No conditional logic, exceptions, or cross-references to other legislation","Extremely short length (effectively one sentence of legal operation)"],"plain_english_summary":"**What this does**\n\nThis document cancels an old aircraft safety rule (called an **Airworthiness Directive** or AD) that applied to **Piper PA-24 Comanche** aeroplanes.\n\n**The old rule**\n\nSince 1965, owners of these aircraft were required to modify the automatic pilot's **pitch servomotor** (the component that controls the up-down movement of the plane) according to specific manufacturer service bulletins (Piper SB No. 224 and Mitchell SB No. A55).\n\n**What changes now**\n\nAs of **23 October 2008**, this modification is **no longer required**. The Civil Aviation Safety Authority (CASA) has cancelled the directive, meaning owners no longer need to perform this specific autopilot work to keep their aircraft legally compliant.\n\n**Who is affected**\n\nOwners and operators of Piper PA-24 Comanche series aircraft. This removes a maintenance burden—they can disregard the 1965 modification requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-24-18-automatic-pilot-pitch-servomotor-modification-cancelled","history":"/api/acts/ad-pa-24-18-automatic-pilot-pitch-servomotor-modification-cancelled/history","analysis":"/api/acts/ad-pa-24-18-automatic-pilot-pitch-servomotor-modification-cancelled/analysis","conflicts":"/api/acts/ad-pa-24-18-automatic-pilot-pitch-servomotor-modification-cancelled/conflicts","importantCases":"/api/acts/ad-pa-24-18-automatic-pilot-pitch-servomotor-modification-cancelled/important-cases","documents":"/api/acts/ad-pa-24-18-automatic-pilot-pitch-servomotor-modification-cancelled/documents"}}