{"id":"F2007L01058","name":"AD/BEECH 55/94 - Propeller Accumulator Oil Tube","slug":"ad-beech-55-94-propeller-accumulator-oil-tube","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":65013,"registerId":"commonwealth-F2007L01058-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Beechcraft 55, 58 and 95-55 (Baron) Seri","sectionType":"division","heading":"Beechcraft 55, 58 and 95-55 (Baron) Series Aeroplanes","content":"### Beechcraft 55, 58 and 95-55 (Baron) Series Aeroplanes\n\n| AD/BEECH 55/94 | Propeller Accumulator Oil Tube | 5/2007 |\n| -------------- | ------------------------------ | ------ |\n\n| Applicability: | Raytheon Aircraft Company (Beechcraft) Baron models 58 and G58 aircraft serial numbers TH-2097 through TH-2150, inclusive, with optional propeller unfeathering accumulators installed.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Inspect the left propeller accumulator oil tube assembly for chafing, in accordance with the provisions of Raytheon Aircraft Company (RAC) Mandatory Service Bulletin (MSB) No. SB 61-3806 original issue dated August 2006 or later FAA approved revisions.2. If any chafing is found during the inspection per Requirement 1 of this AD, replace the propeller accumulator oil tube assembly in accordance withMSB 61-3806 original issue or later FAA approved revisions.3. Reposition and secure with clamps the left manifold pressure hose and its metal identification tags to ensure clearance between it and all tubes, hoses, electrical wires, parts, components, and structure in accordance with MSB 61-3806 original issue or later FAA approved revisions.Note: FAA Airworthiness Directive (AD) 2007-06-07 Amendment 39-14988 refers. |\n| Compliance:    | 1. For airplanes that have not had a 100-hour time-in-service (TIS) inspection or the inspection following Raytheon Safety Communiqué No. 271, dated May 2006:Within the next 25 hours TIS, after the effective date of this AD.For airplanes that have had a 100-hour TIS inspection or the inspection following Raytheon Safety Communiqué No. 271:Within the next 50 hours TIS, after the effective date of this AD.2. Before further flight, after the inspection per Requirement 1 of this AD.3. Before further flight, after the inspection or replacement required per Requirement 1 or Requirement 2 of this AD.                                                                                                                                                                                                                                 |\n|                | This Airworthiness Directive becomes effective on 10 May 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n\n| Background: | This AD results from several reports of chafing damage on the left propeller accumulator oil tube assembly, resulting in an in-flight-oil-leak from the left engine.The actions required by this AD are intended to detect, correct, and prevent any chafing damage of the left propeller accumulator oil tube assembly, which could result in loss of engine oil. Loss of engine oil may lead to fire or smoke in the engine compartment, inability to unfeather the propeller, engine damage, or loss of engine power. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n27 March 2007","sortOrder":0},{"sectionNumber":"AD/BEECH 55/94","sectionType":"part","heading":"AD/BEECH 55/94","content":"## AD/BEECH 55/94","sortOrder":1},{"sectionNumber":"Propeller Accumulator Oil Tube","sectionType":"part","heading":"Propeller Accumulator Oil Tube","content":"## Propeller Accumulator Oil Tube","sortOrder":2},{"sectionNumber":"5/2007","sectionType":"part","heading":"5/2007","content":"## 5/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD’s scope aligns with its stated purpose to detect and correct chafing of the left propeller accumulator oil tube. It confines action to specified serial-numbered aircraft with the optional accumulator and relies on the Raytheon service bulletin and FAA AD for procedures; no expansion or narrowing beyond that intent is indicated in the source text."},"complexity_factors":["Narrow applicability: specific serial-number range limits affected fleet but requires targeted action","Technical, safety-critical inspection of a specific oil tube assembly that may require component replacement","Dependency on Raytheon Mandatory Service Bulletin (SB 61-3806) and any later FAA‑approved revisions for procedural detail","Short compliance windows (25–50 flight hours; before further flight for corrective actions) impose scheduling and downtime costs","Potential parts availability and maintenance labour costs borne by operators","Regulatory cross-reference to an FAA AD increases oversight and documentation requirements"],"plain_english_summary":"This AD requires owners/operators of Raytheon (Beechcraft) Baron 58/G58 aircraft (serials TH‑2097–TH‑2150) with optional propeller unfeathering accumulators to have maintenance personnel inspect the left propeller accumulator oil tube for chafing and, if needed, replace it and reposition/secure the left manifold pressure hose and identification tags in accordance with Raytheon’s service bulletin. Inspections and corrective work must be done within a short flight‑hour window or before further flight. It matters because chafing has caused in‑flight oil leaks that risk fire, loss of unfeathering, engine damage or power loss; operators pay compliance costs and schedule the work under the bulletin and AD."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope. It addresses a specific safety defect identified through incident reports (chafing of the left propeller accumulator oil tube) in a defined aircraft population. The requirements remain tightly focused on inspection, replacement, and prevention of the identified hazard without expanding to unrelated systems or broader aircraft modifications."},"complexity_factors":["Single, specific mechanical issue addressed (chafing of one component)","Clear three-step requirement structure (inspect, replace if needed, reposition hose)","Two-tier compliance deadline based on prior maintenance history","References external technical document (Raytheon MSB 61-3806) for detailed procedures","Limited applicability — only specific serial number range of two aircraft models","No nested exceptions or conditional logic beyond the two compliance timelines"],"plain_english_summary":"This mandatory CASA AD requires owners/operators of Beechcraft Baron 58 and G58 aircraft (serials TH-2097–TH-2150) with optional propeller unfeathering accumulators to inspect the left propeller accumulator oil tube for chafing, replace any damaged tube, and reposition/secure a nearby manifold pressure hose. It responds to in‑flight oil leaks that have caused engine smoke, fire risk, failed unfeathering and possible engine loss — compliance within the AD’s short flight‑hour windows is mandatory."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-55-94-propeller-accumulator-oil-tube","history":"/api/acts/ad-beech-55-94-propeller-accumulator-oil-tube/history","analysis":"/api/acts/ad-beech-55-94-propeller-accumulator-oil-tube/analysis","conflicts":"/api/acts/ad-beech-55-94-propeller-accumulator-oil-tube/conflicts","importantCases":"/api/acts/ad-beech-55-94-propeller-accumulator-oil-tube/important-cases","documents":"/api/acts/ad-beech-55-94-propeller-accumulator-oil-tube/documents"}}