{"id":"F2006B03964","name":"AD/BEECH 55/13 - Pneumatic Pressure Regulator","slug":"ad-beech-55-13-pneumatic-pressure-regulator","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43573,"registerId":"commonwealth-F2006B03964-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 55/13 - Pneumatic Pressure Regulator","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 55, 58 and 95-55 (Baron) Series Aeroplanes\n\n \n\nAD/BEECH 55/13 Pneumatic Pressure Regulator 2/69\n\nApplicability: Model 95-D55 fitted with Beech Pneumatic De-icer system and Beech model B5 auto-pilot.\n\n \n\nRequirement: Action in accordance with Brittain Industries Inc. SB No. 68-1 Revision A.\n\n \n\nNote: FAA AD 68-14-1 refers.\n\n \n\nCompliance: Before 1 September 1971.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD’s scope is limited to Model 95-D55 aeroplanes fitted with the specified de-icer system and autopilot, and it requires following the named service bulletin by a fixed date. There is no text in the instrument indicating an expansion or narrowing of that scope from the directive as presented; the AD consistently identifies applicability, the required action, and the deadline (Applicability; Requirement; Compliance)."},"complexity_factors":["Narrow, specific applicability (only Model 95-D55 with Beech Pneumatic De-icer and B5 autopilot) (Applicability).","Mandates an external technical document (Brittain Industries Inc. SB No. 68-1 Revision A) rather than reproducing procedures in the AD (Requirement).","Fixed calendar compliance deadline imposes scheduling and resource constraints on operators (Compliance).","Cross-reference to FAA AD introduces an additional external reference for context or interpretation (Note).","Limited text in the AD means operators/maintainers must obtain and interpret the service bulletin; operational detail is off-loaded to the SB (Requirement)."],"plain_english_summary":"# What this directive does\n\nThis Airworthiness Directive (AD) orders a specific maintenance action for a small, well-defined set of aeroplanes. Mechanically, it requires operators of the affected aeroplane model to carry out the work described in an external service bulletin (Brittain Industries Inc. SB No. 68-1 Revision A) by a fixed deadline. The AD also points to a corresponding FAA airworthiness directive (FAA AD 68-14-1).\n\n# Who is affected\n\n- Operators/owners of Beechcraft Model 95-D55 aeroplanes that are fitted with a Beech Pneumatic De-icer system and a Beech model B5 autopilot. (See: \"Applicability\")\n\n# What must be done and when\n\n- The operator must perform the action set out in Brittain Industries Inc. SB No. 68-1 Revision A. (See: \"Requirement\")\n- The work must be completed before 1 September 1971. (See: \"Compliance\")\n\n# Where the AD points you for technical detail\n\n- The AD does not set out step-by-step instructions itself; it mandates compliance with the specified service bulletin for the technical details. (See: \"Requirement\")\n- It also notes a related FAA AD for cross-reference. (See: \"Note\")\n\n# Who pays, who decides, and what changes in behaviour\n\n- Who pays: aircraft owners/operators bear the cost of obtaining and following the Brittain service bulletin and any parts, labour and aircraft downtime required to carry out the work. (Inferred from the AD requiring the operator to perform the action described in the service bulletin; see: \"Requirement\" and \"Compliance\")\n- Who decides: the Civil Aviation authority issued the AD and set the deadline; the AD prescribes the specific external bulletin as the mandatory technical standard. (See: header and \"Requirement\")\n- Behaviour change: operators must schedule the required maintenance, obtain the referenced service bulletin, and certify compliance before the stated date; maintenance organisations must follow the bulletin’s procedures when working on affected aircraft. (See: \"Requirement\" and \"Compliance\")\n\n# Implementation and compliance considerations\n\n- Compliance depends on access to Brittain Industries Inc. SB No. 68-1 Revision A because the AD does not reproduce the technical steps. That creates a dependency on an external document for conformity. (See: \"Requirement\")\n- The AD fixes a calendar deadline (before 1 September 1971), so operators face a time-constrained compliance cost: labour, parts, and downtime must be arranged and paid for by that date. (See: \"Compliance\")\n- Cross-reference to an FAA AD suggests harmonisation with a foreign regulator’s action; operators or maintainers may consult that FAA AD for additional context. (See: \"Note\")\n\n# Trade-offs and risks (mechanical/economic)\n\n- The AD concentrates obligations on a narrowly defined set of aircraft (Model 95-D55 with two specific fittings), so the cost is concentrated on those owners/operators. (See: \"Applicability\")\n- The AD is short on procedural detail within the directive itself, which reduces regulatory text but shifts the burden of getting and applying the technical instructions to operators and maintenance providers. (See: \"Requirement\")\n- Enforcement is by regulatory prescription of a service bulletin and a deadline; discretion is limited as to whether to comply, but scheduling and certification remain with operator/maintenance organisations. (See: \"Requirement\" and \"Compliance\")\n\n# Source references within the instrument\n\n- Applicability: identifies the exact model and equipment scope. (See: \"Applicability\")\n- Requirement: mandates action in accordance with Brittain Industries Inc. SB No. 68-1 Revision A. (See: \"Requirement\")\n- Note: refers to FAA AD 68-14-1. (See: \"Note\")\n- Compliance: sets the deadline (before 1 September 1971). (See: \"Compliance\")"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive targeting a specific known defect in specific aircraft configurations. It has not expanded beyond its original narrow safety purpose."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 defined applicability criteria (specific aircraft model + specific equipment fit)","Single requirement referencing external technical document (service bulletin)","No nested conditions, exceptions, or cross-references to other legislation","Simple compliance deadline with no alternative methods or conditional timelines","Straightforward command structure: identify if applicable → perform action → meet deadline"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** It requires owners or operators of certain Beechcraft Baron aeroplanes to perform a specific maintenance action on their **pneumatic pressure regulator** (a component that controls air pressure in the de-icing system). The action must follow instructions in a service bulletin from Brittain Industries.\n\n**Who it affects:** \n- **Aircraft:** Beechcraft Model 95-D55 Baron planes\n- **Equipment:** Only those fitted with:\n  - Beech Pneumatic De-icer system (equipment that removes ice using compressed air), AND\n  - Beech model B5 auto-pilot (automatic flight control system)\n\n**Why it matters:** The pneumatic pressure regulator apparently had a safety defect that could affect the de-icing system or auto-pilot. The directive mandates a fix to prevent potential in-flight safety issues.\n\n**Key details:**\n- **Compliance deadline:** Before 1 September 1971 (this is a historical directive — long past)\n- **Reference:** Follows a US Federal Aviation Administration (FAA) directive (AD 68-14-1) and a manufacturer's service bulletin (Brittain Industries SB No. 68-1 Revision A)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-55-13-pneumatic-pressure-regulator","history":"/api/acts/ad-beech-55-13-pneumatic-pressure-regulator/history","analysis":"/api/acts/ad-beech-55-13-pneumatic-pressure-regulator/analysis","conflicts":"/api/acts/ad-beech-55-13-pneumatic-pressure-regulator/conflicts","importantCases":"/api/acts/ad-beech-55-13-pneumatic-pressure-regulator/important-cases","documents":"/api/acts/ad-beech-55-13-pneumatic-pressure-regulator/documents"}}