{"id":"F2006B03807","name":"AD/BEECH 33/4 - Heater Installation","slug":"ad-beech-33-4-heater-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43403,"registerId":"commonwealth-F2006B03807-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 33/4 - Heater Installation","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 33 and 35-33 (Debonair/Bonanza) Series Aeroplanes\n\n \n\nAD/BEECH 33/4 Heater Installation 2/69\n\nApplicability: All models fitted with Hanlon and Wilson heater-muffler P/N 8046-1. Requirement:  Action in accordance with Beechcraft SI No. 0096-412.\n\nCompliance: Within 100 hours time in service after 14 February 1969 and thereafter at intervals not exceeding 100 hours time in service.\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 known defect in a specific aircraft component. It has not expanded beyond its original purpose of ensuring heater-muffler safety in affected Beechcraft models."},"complexity_factors":["Single, specific applicability criterion (one part number)","Single cross-reference to external technical document (Beechcraft SI)","Simple recurring compliance interval (100 hours time in service)","No defined terms section","No conditional logic or exceptions","Extremely brief — approximately 100 words total"],"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 and operators of certain **Beechcraft Debonair and Bonanza aeroplanes** (models 33 and 35-33 series) to take specific safety action regarding their cabin heater systems.\n- The affected aircraft are those fitted with a particular **Hanlon and Wilson heater-muffler** (part number 8046-1).\n\n**What action is required:**\n- Operators must follow the instructions in **Beechcraft Service Instruction No. 0096-412** — a technical document from the manufacturer detailing inspection or maintenance procedures for the heater installation.\n\n**When it must be done:**\n- **First compliance:** Within 100 hours of flying time after 14 February 1969\n- **Ongoing compliance:** Repeated every 100 hours of flying time thereafter\n\n**Why it matters:**\nHeater-muffler failures in aircraft can cause **carbon monoxide poisoning** or **fire hazards** — both potentially fatal at altitude. This directive ensures regular inspection of a known problematic component to prevent accidents.\n\n**Who it affects:**\n- Owners and operators of affected Beechcraft aircraft\n- Licensed aircraft maintenance engineers who perform the work\n- CASA, which enforces compliance"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text of this Directive states a clear, narrowly defined scope: all Beechcraft 33 and 35-33 series aeroplanes fitted with Hanlon and Wilson heater-muffler P/N 8046-1 must follow Beechcraft SI No. 0096-412 at initial and recurring 100‑hour intervals. The instrument itself does not indicate any change from an earlier or different scope within the text provided."},"complexity_factors":["Narrow, simple applicability limited to aircraft fitted with a single specified part (Applicability).","Procedural detail is delegated to an external document (Beechcraft SI No. 0096-412), which is not reproduced in the Directive (Requirement).","A recurring, fixed compliance interval (every 100 hours TIS) creates ongoing operational and administrative burden (Compliance).","No alternative compliance paths or exemptions are stated in the text, increasing procedural clarity but relying on the external SI for technical options (Requirement).","The AD’s date-based initial compliance trigger (after 14 February 1969) is historical but precise, which may complicate record checks for older aircraft (Compliance)."],"plain_english_summary":"This Airworthiness Directive from the Civil Aviation Safety Authority mandates recurring maintenance for Beechcraft 33 and 35‑33 aeroplanes fitted with Hanlon & Wilson heater‑muffler P/N 8046‑1. Owners/operators must carry out the work specified in Beechcraft Service Instruction No. 0096‑412 within 100 hours TIS after 14 February 1969 and thereafter at intervals not exceeding 100 hours, bearing all costs and sourcing the SI for technical detail."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-33-4-heater-installation","history":"/api/acts/ad-beech-33-4-heater-installation/history","analysis":"/api/acts/ad-beech-33-4-heater-installation/analysis","conflicts":"/api/acts/ad-beech-33-4-heater-installation/conflicts","importantCases":"/api/acts/ad-beech-33-4-heater-installation/important-cases","documents":"/api/acts/ad-beech-33-4-heater-installation/documents"}}