{"id":"F2006B08232","name":"AD/CESSNA 337/11 - Aileron Control Tube - Inspection and Automatic Pilot Roll Servo - Removal","slug":"ad-cessna-337-11-aileron-control-tube-inspection-and-automatic-pilot-roll-servo-removal","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115482,"registerId":"commonwealth-F2006B08232-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 337/11 - Aileron Control Tube - Inspection and Automatic Pilot Roll Servo - Removal","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)  Cessna 337 Series Aeroplanes\n\n \n\n# AD/CESSNA 337/11 Aileron Control Tube - Inspection and\n\nAutomatic Pilot Roll Servo - Removal\n\nApplicability: Model 337 fitted with Mitchell Automatic Pilot Models AK155, AK155E or\n\n# 2/72\n\nAK155E-3 not modified in accordance with Edo-Aire Mitchell Service Letter ML 32.\n\n \n\nDocument: 1. Edo-Aire Mitchell Service Bulletin MB6; or 2. FAA AD 72-2-6.\n\nCompliance: Within 25 hours time in service after 25 February 1972.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused on a specific mechanical inspection and component removal. It has not expanded beyond its original safety purpose regarding Cessna 337 aileron control tubes and Mitchell autopilot systems."},"complexity_factors":["Very short document (approximately 150 words)","Only 3 defined applicability criteria (aircraft model, specific autopilot models, exemption condition)","Single compliance requirement with clear time limit","No nested exceptions or conditional logic beyond the initial applicability test","References only 2 external documents (Service Bulletin and FAA AD)","No cross-referencing to other legislation sections"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\n- Requires owners/operators of certain **Cessna 337 series aeroplanes** (twin-engine push-pull aircraft) to:\n  1. **Inspect the aileron control tube** (the metal rod that connects the pilot's control inputs to the wing flaps that roll the aircraft)\n  2. **Remove the automatic pilot roll servo** (a motor that assists the autopilot in controlling the aircraft's roll/banking) if it's a Mitchell AK155, AK155E, or AK155E-3 model\n\n**Who it affects:**\n- Owners and operators of Cessna Model 337 aircraft\n- Specifically those with Mitchell autopilot systems (models AK155, AK155E, or AK155E-3)\n- **Unless** the aircraft has already been modified according to Edo-Aire Mitchell Service Letter ML 32\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety instructions. If you don't comply, you cannot legally fly the aircraft. This particular directive addresses a safety issue with the autopilot system potentially interfering with or damaging the aileron control mechanism — a critical flight control. The 25-hour compliance window suggests this was considered urgent but not immediately grounding.\n\n**Key dates:**\n- Compliance deadline: Within 25 hours of flight time after 25 February 1972\n- This is an older directive (reference number suggests 1972 origin, updated as AD/CESSNA 337/11)"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The provided text sets a narrow, specific set of requirements (inspect aileron control tube; remove Mitchell autopilot roll servo for listed models unless modified per ML 32) and provides no indication that the AD changes scope from an earlier intent. The instrument itself defines its applicability and deadline; no internal text indicates a change to those parameters."},"complexity_factors":["Limited number of substantive requirements (inspection and removal) concentrated in the title and applicability.","Short, fixed compliance window (25 hours after 25 February 1972) increases practical urgency.","Conditional applicability based on prior modification per Edo‑Aire Mitchell Service Letter ML 32 introduces a binary exemption.","Procedural detail is delegated to external documents (Edo‑Aire MB6 or FAA AD 72-2-6), so understanding and performing compliance depends on those referenced technical sources.","Technical and safety-critical subject matter (flight controls and autopilot) may require specialist maintenance skills and parts."],"plain_english_summary":"This AD mandates owners/operators of Cessna 337s fitted with Mitchell autopilots AK155, AK155E or AK155E‑3 (unless previously modified per Edo‑Aire ML 32) to inspect the aileron control tube and remove the Mitchell roll servo, following Edo‑Aire MB6 or FAA AD 72‑2‑6, within 25 hours TIS after 25 Feb 1972. Operators pay for and arrange the work; the action addresses an implied unsafe condition with those components."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-337-11-aileron-control-tube-inspection-and-automatic-pilot-roll-servo-removal","history":"/api/acts/ad-cessna-337-11-aileron-control-tube-inspection-and-automatic-pilot-roll-servo-removal/history","analysis":"/api/acts/ad-cessna-337-11-aileron-control-tube-inspection-and-automatic-pilot-roll-servo-removal/analysis","conflicts":"/api/acts/ad-cessna-337-11-aileron-control-tube-inspection-and-automatic-pilot-roll-servo-removal/conflicts","importantCases":"/api/acts/ad-cessna-337-11-aileron-control-tube-inspection-and-automatic-pilot-roll-servo-removal/important-cases","documents":"/api/acts/ad-cessna-337-11-aileron-control-tube-inspection-and-automatic-pilot-roll-servo-removal/documents"}}