{"id":"F2006B03861","name":"AD/BEECH 35/65 - Cabin Fresh Air Blower","slug":"ad-beech-35-65-cabin-fresh-air-blower","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43470,"registerId":"commonwealth-F2006B03861-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 35/65 - 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 35 (Bonanza) Series Aeroplanes\n\n \n\nAD/BEECH 35/65 Cabin Fresh Air Blower 12/91\n\nApplicability: Model V35B with serial numbers D-10348, and D-10364 through D-10403. Requirement:               Action IAW the Technical Requirements of FAA AD 91-20-08 Amdt 39-8042.\n\nNote: Beech SB 2380 refers.\n\n \n\nCompliance: As specified in the requirement documents 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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific aircraft model. It has not expanded beyond its original purpose of mandating inspection/repair of cabin blower housings."},"complexity_factors":["Very short document (under 200 words)","Only 1 defined applicability criterion (specific serial number range)","Single technical requirement: comply with external FAA document","No nested exceptions or conditional logic","No cross-references to other Australian legislation","Straightforward compliance deadline with simple extension"],"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:** It requires owners/operators of specific Beechcraft Bonanza V35B aeroplanes to inspect and fix a problem with the **cabin fresh air blower** (the fan that pushes fresh air into the cockpit). The blower's housing can break loose, and if it does, the spinning fan could hit the **flight control cables** that run underneath it — the wires that actually move the plane's control surfaces. That's obviously very bad.\n\n**Who it affects:** Only specific planes: Beechcraft Model V35B with serial numbers D-10348, and D-10364 through D-10403. If you don't own one of these exact planes, this doesn't apply to you.\n\n**What must be done:** The aircraft owner/operator must follow the technical instructions in **FAA AD 91-20-08** (a US safety order that Australia is adopting). There's also a reference to **Beechcraft Service Bulletin 2380** — manufacturer's guidance on how to do the fix.\n\n**When:** The work must be done by **12 December 1991** for Australian-registered aircraft. This is about a month later than the US deadline, giving Aussie operators slightly more time.\n\n**Why it matters:** A loose blower hitting flight controls could cause a crash. This directive exists to prevent that before it happens."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The Australian instrument adopts the FAA AD’s technical requirements but alters the effective date for Australian-registered aircraft, extending it by approximately one month and specifying 12 December 1991 as the revised effective date. The substantive technical requirements are unchanged in this text; the change is to timing and the local applicability statement (specific Model V35B serial numbers). (See: \"Requirement\"; \"Compliance\"; \"Background\".)"},"complexity_factors":["Direct reliance on external technical documents (FAA AD 91-20-08 Amdt 39-8042) for mandatory content","Reference to manufacturer service bulletin (Beech SB 2380) without reproducing technical steps","Narrow applicability tied to specific model and serial number range","Cross-jurisdictional coordination (CASA adopting FAA requirements but altering effective date)","Operational implications (inspection/repair, potential grounding) depend on the external documents and local maintenance capacity"],"plain_english_summary":"### What this directive does (mechanical change)\n\nThis Airworthiness Directive (AD) requires owners/operators of certain Beechcraft Model V35B aeroplanes to carry out the maintenance actions set out in a specific FAA AD (FAA AD 91-20-08, Amendment 39-8042). The Australian regulator (CASA) adopts the FAA technical requirements but sets a revised effective date of 12 December 1991 for Australian-registered aircraft. (See: \"Requirement\"; \"Compliance\".)\n\n### Which aeroplanes are affected\n\n- Only Beechcraft 35 (Bonanza) Model V35B aircraft with serial numbers D-10348 and D-10364 through D-10403 are in scope. (See: \"Applicability\".)\n\n### Why it was issued (stated reason)\n\n- Reports of failures of the cabin fresh air blower housing attachment have been received. The reported failure mode could allow the blower to impinge on the flight control cables located below it. The AD’s technical actions are intended to address that mechanical hazard. (See: \"Background\".)\n\n### How it works in practice\n\n- The AD does not reproduce technical steps in full. Instead it requires operators to perform the actions specified in the FAA document (FAA AD 91-20-08 Amdt 39-8042). A Beech service bulletin (SB 2380) is referenced. Operators must consult those documents to know the specific inspections, modifications, repairs, or replacements to be performed. (See: \"Requirement\"; \"Note\".)\n\n### Who pays and who decides\n\n- Who pays: Owners or operators of the affected Australian-registered aeroplanes will bear the direct costs (parts, labour, downtime) of whatever inspections or corrective work the FAA AD and the referenced Beech service bulletin require. (See: \"Requirement\"; \"Compliance\".)\n- Who decides: CASA requires compliance by referencing the FAA AD; the precise technical actions are set out in the FAA AD and related service bulletin. CASA exercised regulatory discretion by changing the effective date for Australia. (See: \"Requirement\"; \"Compliance\"; \"Background\".)\n\n### Compliance burden and operational effects\n\n- Compliance entails carrying out the procedures specified in the FAA AD (and possibly the Beech SB). That may require scheduled maintenance time, replacement parts, and possible temporary grounding of the aircraft until the work is completed. The AD’s text does not quantify costs or downtime; operators must consult the FAA AD and Beech SB for technical detail and estimate costs locally. (See: \"Requirement\"; \"Note\"; \"Compliance\".)\n\n### Trade-offs, incentives and implementation risk\n\n- The AD’s stated safety objective is to prevent blower impingement on flight control cables. The concrete trade-off is between the immediate cost and downtime of inspections/repairs and the reduction of the mechanical risk described in the Background. (See: \"Background\".)\n- Implementation risk is that the AD references external documents for the required technical work: operators must obtain and correctly apply FAA AD 91-20-08 and Beech SB 2380. Any failure to follow those external documents or to secure appropriate parts/skills could leave the hazard unremedied. (See: \"Requirement\"; \"Note\".)\n\n### Administrative detail worth noting\n\n- CASA extended the FAA’s effective date by about one month for Australian-registered aircraft; the revised effective date is 12 December 1991. This is a timing adjustment and does not, in this text, change the substance of the FAA’s technical requirements. (See: \"Compliance\"; \"Background\".)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-35-65-cabin-fresh-air-blower","history":"/api/acts/ad-beech-35-65-cabin-fresh-air-blower/history","analysis":"/api/acts/ad-beech-35-65-cabin-fresh-air-blower/analysis","conflicts":"/api/acts/ad-beech-35-65-cabin-fresh-air-blower/conflicts","importantCases":"/api/acts/ad-beech-35-65-cabin-fresh-air-blower/important-cases","documents":"/api/acts/ad-beech-35-65-cabin-fresh-air-blower/documents"}}