{"id":"F2006B03811","name":"AD/BEECH 33/43 - KA-33 Cooling Blower","slug":"ad-beech-33-43-ka-33-cooling-blower","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43407,"registerId":"commonwealth-F2006B03811-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)\n\nBeechcraft 33 and 35-33 (Debonair/Bonanza) Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/BEECH 33/43 KA-33 Cooling Blower 8/20","sectionType":"part","heading":"AD/BEECH 33/43 KA-33 Cooling Blower 8/2001","content":"# AD/BEECH 33/43 KA-33 Cooling Blower 8/2001\n\nApplicability: Beech Model F33A aeroplanes, serial numbers CE-1050 through CE-1791 inclusive. Requirement: 1. Inspect the aeroplane in accordance with Part I of the Accomplishment\n\nInstructions of Raytheon Mandatory Service Bulletin SB 34-3267, issued March 1999, to verify whether a KA-33 avionics cooling blower system is installed and operating correctly.\n\n    2. If the Requirement 1 inspection confirms that a KA-33 cooling blower is fitted, install a one ampere circuit breaker, part number 7277-2-1, in place of the factory installed three ampere or five ampere circuit breakers in accordance with Part II of the Accomplishment Instructions of SB 34-3267.\n\n    3. Three ampere or five ampere circuit breakers must not be installed on any aeroplane to protect the KA-33 cooling blower.\n\nNote: FAA AD 2001-11-03 Amdt 39-12244 refers.\n\nCompliance: For Requirement 1 - Within the next 600 hours time-in-service after the effective date of this Directive or the next six calendar months after the effective date of this Directive, whichever occurs first.\n\nFor Requirement 2 - Before further flight after the Requirement 1 inspection. For Requirement 3 - As of the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 9 August 2001.\n\nBackground: The United States Federal Aviation Administration has received several reports of blower motors failing, seizing, smoking, and producing a burning odour that enters the cabin and passenger compartment. These events are the result of the blower motor having circuit protection of more than one ampere. This level of circuit protection does not prevent the blower motor from smoking and creating a burning odour should it fail or seize.","sortOrder":1}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD sticks to correcting the unsafe condition described (blower motors seizing and smoking) by mandating inspection and breaker replacement for a defined set of aircraft. It does not broaden obligations beyond the specified model/serial range or introduce additional regulatory powers; compliance duties and costs remain with owners/operators (Requirements; Compliance; Background)."},"complexity_factors":["Narrow applicability to specific model and serial number range (CE-1050–CE-1791)","Simple, discrete required actions: inspection and specific breaker replacement (Requirements 1–3)","Mandated use of a specific replacement part number (7277-2-1)","Compliance timing with alternative triggers (600 hours time-in-service or six months)","Reference to Raytheon Mandatory Service Bulletin SB 34-3267 for accomplishment instructions","Cross-reference to FAA AD 2001-11-03 and use of CASA delegate power under CAR subreg 39.1(1)"],"plain_english_summary":"Requires owners/operators of Beech F33A aeroplanes (serials CE-1050–CE-1791) to inspect for a KA-33 avionics cooling blower and, if fitted, replace the factory three‑ampere or five‑ampere circuit breaker with a one‑ampere breaker (P/N 7277‑2‑1); three‑ and five‑ampere breakers are then prohibited for that blower. Inspection must occur within 600 flight hours or six months and replacement before further flight (Requirements 1–3; Compliance). CASA cites FAA reports of blower motors seizing, smoking and emitting burning odour (Background). Costs (inspection, part and labour) fall to owners/operators."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope. It addresses a specific unsafe condition in a defined aircraft type and does not expand beyond the original safety purpose of preventing blower motor overheating."},"complexity_factors":["Single, clearly defined applicability (one aircraft model, specific serial number range)","Only three operational requirements with straightforward conditional logic (if-then structure)","No defined terms section or complex interpretive provisions","Minimal cross-referencing (only one external document: Raytheon Service Bulletin SB 34-3267)","Simple compliance timeline with clear alternatives (600 hours OR 6 months)","No nested exceptions or sub-delegations","Total length is approximately one page"],"plain_english_summary":"Owners and operators of specified Beechcraft Model F33A (serial CE-1050–CE-1791) must inspect for KA-33 avionics cooling blowers and, if present, replace the existing 3‑amp or 5‑amp circuit breaker with a 1‑amp breaker and not reinstall the higher‑rated breakers. \n\nThe directive responds to FAA reports of blower motors seizing, smoking, and creating fire/smoke hazards when higher-rated breakers failed to trip, so the change prevents overheating and potential cockpit fire."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-33-43-ka-33-cooling-blower","history":"/api/acts/ad-beech-33-43-ka-33-cooling-blower/history","analysis":"/api/acts/ad-beech-33-43-ka-33-cooling-blower/analysis","conflicts":"/api/acts/ad-beech-33-43-ka-33-cooling-blower/conflicts","importantCases":"/api/acts/ad-beech-33-43-ka-33-cooling-blower/important-cases","documents":"/api/acts/ad-beech-33-43-ka-33-cooling-blower/documents"}}