{"id":"F2006B03894","name":"AD/BEECH 36/39 - Cabin Fresh Air Blower","slug":"ad-beech-36-39-cabin-fresh-air-blower","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43503,"registerId":"commonwealth-F2006B03894-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 36/39 - Cabin Fresh Air Blower","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)  Beechcraft 36 (Bonanza) Series Aeroplanes\n\n \n\nAD/BEECH 36/39 Cabin Fresh Air Blower 12/91\n\nApplicability: Model A36 with serial numbers E-1809 through E-2592.\n\n \n\nModel A36TC and B36TC with serial numbers EA-192 through EA-514.\n\n \n\nRequirement: Action in accordance with the Technical Requirements of FAA AD 91-20-08 Amdt 39-8042.\n\n \n\nNote: Beech SB 2380 refers.\n\n \n\nCompliance: As specified in the requirement document with a revised effective date of 12 December 1991 for Australian registered aircraft.\n\n \n\nBackground: Reports have been received of air blower housing attachment failures. This condition could lead to blower impingement on the flight control cables located below the blower. The effective date required by the FAA is extended by approximately one month.\n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This instrument adopts the FAA AD's technical requirements for the listed Beechcraft models but changes the timing: it extends the FAA's effective date by approximately one month for Australian-registered aircraft and sets the revised effective date as 12 December 1991. The substantive technical scope (the FAA AD's requirements) is adopted; the only scope change reflected in the text is the adjusted compliance date for Australian registration. (Requirement; Compliance; Background)"},"complexity_factors":["Cross-reference to an external technical document (FAA AD 91-20-08) requiring access and interpretation of another instrument (Requirement)","Reference to a manufacturer service bulletin (Beech SB 2380) rather than reproducing technical steps in this text (Note)","Applicability limited to specific serial-number ranges, requiring operators to check serial numbers against the list (Applicability)","Revised effective date for a specific registry (Australian-registered aircraft) creates a timing variation from the FAA original (Compliance)","Technical nature of inspections/repairs implies specialist maintenance resources and possible aircraft downtime (Requirement; Background)"],"plain_english_summary":"What this instrument does mechanically\n\n- Requires owners/operators of specific Beechcraft A36/A36TC/B36TC aeroplanes (identified by serial number ranges) to carry out the maintenance, inspection and/or modification actions set out in FAA Airworthiness Directive 91-20-08 Amendment 39-8042. (Applicability; Requirement)\n- Refers also to Beech Service Bulletin 2380 as a related technical document. (Note)\n- Sets the compliance timing for Australian-registered aircraft to a revised effective date of 12 December 1991. (Compliance)\n\nWhy it was issued (the stated safety concern)\n\n- The text states there have been reports of air blower housing attachment failures. That condition could allow the cabin fresh-air blower to impinge on flight control cables located below the blower. The requirement to follow the FAA AD is presented as the prescribed corrective action. (Background; Requirement)\n\nWho is affected and who decides\n\n- Affected parties: owners and operators of the identified Beechcraft models and serial numbers (they must arrange and pay for the inspections/repairs required by the FAA AD and any related service bulletin). (Applicability; Requirement)\n- Decision-makers: the Civil Aviation Safety Authority has adopted the FAA AD into the Australian Schedule of Airworthiness Directives and has set a specific effective date for Australian-registered aircraft. The FAA AD itself contains the technical steps to be performed. (Requirement; Compliance)\n\nHow behaviour must change and what that costs\n\n- Behaviour change required: arrange for the aircraft to be inspected and any required corrective action performed in accordance with FAA AD 91-20-08 and Beech SB 2380. (Requirement; Note)\n- Immediate costs and burdens: operators bear the direct costs of inspection, any corrective parts and labour, and any aircraft downtime while work is done. The document does not specify cost amounts; it sets the legal obligation to follow the referenced technical requirements. (Requirement)\n\nImplementation choices and operational effects\n\n- The instrument cross-references an external FAA AD and a manufacturer service bulletin rather than reproducing technical steps in full; operators or maintenance providers must obtain and follow those documents to know the exact actions required. (Requirement; Note)\n- Maintenance providers capable of performing the work will receive the business; operators may choose among approved maintenance organisations to comply. (Requirement)\n\nTrade-offs, compliance risk and timing\n\n- The stated safety trade-off is between acting to correct blower-housing attachment failures and the time/cost to carry out inspections and repairs. The notice records that CASA extended the FAA effective date for Australian-registered aircraft by about one month, moving the compliance effective date to 12 December 1991; that changes the period in which operators must complete the work. The text does not quantify safety risk or economic cost. (Background; Compliance)\n\nConcrete citation of source text\n\n- Applicability: Model A36 serial numbers E-1809 through E-2592; Model A36TC and B36TC serial numbers EA-192 through EA-514. (Applicability)\n- Requirement: Action in accordance with the Technical Requirements of FAA AD 91-20-08 Amdt 39-8042. (Requirement)\n- Note: Beech SB 2380 refers. (Note)\n- Compliance: As specified in the requirement document with a revised effective date of 12 December 1991 for Australian registered aircraft. (Compliance)\n- Background: Reports of air blower housing attachment failures that could lead to blower impingement on flight control cables; effective date extended by approximately one month. (Background)\n"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating a safety fix for the cabin fresh air blower housing."},"complexity_factors":["Very short document (under 300 words)","Only 3 defined applicability criteria (specific aircraft models and serial number ranges)","Single requirement: comply with external FAA document","No nested conditions, exceptions, or cross-references to other Australian legislation","Minimal regulatory machinery — essentially a pointer to an existing US airworthiness directive"],"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). Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it does:**\n- **Targets specific planes:** Beechcraft Bonanza Model A36, A36TC, and B36TC aircraft with particular serial numbers (roughly planes built in certain production runs).\n- **Fixes a dangerous problem:** The cabin fresh air blower (a fan that pushes air into the cockpit) can have its housing break loose. If this happens, the spinning fan could hit and damage the flight control cables running underneath it — potentially causing loss of control of the aircraft.\n- **Requires action:** Owners must follow the technical instructions from a US Federal Aviation Administration (FAA) safety order (AD 91-20-08). They can also refer to Beechcraft Service Bulletin 2380 for guidance.\n\n**Who it affects:**\n- Owners and operators of the specified Australian-registered Beechcraft Bonanza models.\n- Maintenance engineers who work on these aircraft.\n\n**Why it matters:**\nThis is a **critical safety issue**. A loose blower fan interfering with flight controls could cause a crash. The directive makes inspection and repair mandatory, with a compliance deadline of 12 December 1991 for Australian aircraft (slightly later than the US deadline to give local operators reasonable time)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-36-39-cabin-fresh-air-blower","history":"/api/acts/ad-beech-36-39-cabin-fresh-air-blower/history","analysis":"/api/acts/ad-beech-36-39-cabin-fresh-air-blower/analysis","conflicts":"/api/acts/ad-beech-36-39-cabin-fresh-air-blower/conflicts","importantCases":"/api/acts/ad-beech-36-39-cabin-fresh-air-blower/important-cases","documents":"/api/acts/ad-beech-36-39-cabin-fresh-air-blower/documents"}}