{"id":"F2006L00360","name":"AD/CON/85 - Improper Maintenance","slug":"ad-con-85-improper-maintenance","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116973,"registerId":"commonwealth-F2006L00360-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Teledyne Continental Motors Piston Engin","sectionType":"division","heading":"Teledyne Continental Motors Piston Engines","content":"### Teledyne Continental Motors Piston Engines\n\n| AD/CON/85 | Improper Maintenance | 3/2006 |\n| --------- | -------------------- | ------ |\n\n| Applicability: | All Teledyne Continental Motors reciprocating engines that have been overhauled, repaired or disassembled between 1 February 2002 and 18 July 2004, to the extent where the main crankcase halves have been split, by B.C. Aero Engines Ltd., an approved maintenance organization (AMO) 84-02, of 5-9566 Hurricane Road, Sidney, British Columbia, Canada.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | 1. Engine Log Book ReviewReview the Technical Records including the engine logbook to determine if the engine had been inspected, repaired or disassembled to the extent the crankcase halves were split, or if the engine had been overhauled by B.C. Aero Engines Ltd. Between 1 February 2002 and 18 July 2004.If no engine inspection, repair or disassembly to the extent the crankcase halves were split, or no engine overhaul work was performed by B.C. Aero Engines Ltd., no further action is required by this directive.2. For Single Engine-Powered Aircraft:Inspect the affected engine for evidence of non-conformity, including the excessive use of crankcase split-line sealant to that recommended by the applicable overhaul manual, crankcase split-line fretting, excessive split-line oil leaks, loss of crankcase through-bolt torque and unapproved repairs. If necessary, restore the engine’s conformity. |\n|                | 3. For Twin Engine-Powered Aircraft:Inspect the affected engine for evidence of non-conformity, including excessive use of crankcase split-line sealant to that recommended by the applicable overhaul manual, crankcase split-line fretting, excessive split-line oil leaks, loss of crankcase through-bolt torque and unapproved repairs. If necessary, restore the engine’s conformity.No further action is required by this directive after the affected engine complies with the requirements of either requirement 2 or 3 of this directive.Note: Transport Canada AD CF-2005-40 refers.                                                                                                                                                                                                                                                                                                                                       |\n\n| Compliance: | 1. Engine Log Book ReviewWithin 30 days after the effective date of this directive.2. For Single Engine-Powered Aircraft:For engines which exhibited in-service difficulties (such as oil leaks or oil filter contamination) prior to the effective date of this directive, within five (5) hours time in service or 30 days after the effective date of this directive, whichever occurs first.For all other engines, within the next 50 hours time in service, or 6 months after the effective date of this directive, whichever occurs first.                                                                                                                                                                                |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|             | 3. For Twin Engine-Powered Aircraft:For engines which exhibited in-service difficulties (such as oil leaks or oil filter contamination) prior to the effective date of this directive, within ten (10) hours time in service or 60 days after the effective date of this directive, whichever occurs first.For all other engines, within the next 100 hours time in service, or 12 months after the effective date of this directive, whichever occurs first.                                                                                                                                                                                                                                                                   |\n|             | This Airworthiness Directive becomes effective on 16 March 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |\n| Background: | Transport Canada has received several reports of disassembly of engines (to correct in-service defects) that were overhauled or repaired by B.C. Aero Engines Ltd. With numerous non-conformities on the engines. Further investigation carried out by Transport Canada has determined certain Teledyne Continental Motors reciprocating engines that have been overhauled, repaired or disassembled by B.C. Aero Engines Ltd. are not in conformance with the manufacturer’s overhaul data and have serious quality issues that may result in an unsafe situation. Transport Canada cancelled B.C. Aero Engines’ AMO (84-02) on 18 July 2004.The above situation, if not corrected, may result in an in-flight engine failure. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n1 February 2006","sortOrder":0},{"sectionNumber":"AD/CON/85","sectionType":"part","heading":"AD/CON/85","content":"## AD/CON/85","sortOrder":1},{"sectionNumber":"Improper Maintenance","sectionType":"part","heading":"Improper Maintenance","content":"## Improper Maintenance","sortOrder":2},{"sectionNumber":"3/2006","sectionType":"part","heading":"3/2006","content":"## 3/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Scope aligns with the directive’s stated aim: it targets engines worked on by B.C. Aero Engines Ltd. between specified dates and requires record review plus inspection/repair where non‑conformities exist (Applicability; Requirement; Background). The directive does not broaden applicability beyond those engines or add unrelated obligations, but it concentrates costs and decision authority on affected operators who must fund inspections and any restorative maintenance (Requirement; Compliance)."},"complexity_factors":["Narrow, time‑bounded applicability tied to work by a single AMO and specific dates (Applicability).","Multiple, tiered compliance deadlines depending on single vs twin‑engine aircraft and prior in‑service symptoms (Compliance: 30 days; 5/10 hours or 30/60 days; 50/100 hours or 6/12 months).","Two distinct steps: documentary review (engine logbook/technical records) and physical inspection/restoration if non‑conformity found (Requirement).","Technical judgement required to assess conformity with the manufacturer’s overhaul manual (e.g. acceptable sealant use, through‑bolt torque, fretting) — may need specialist maintenance action (Requirement).","Potential operational cost and downtime: inspections, possible teardown/repairs, parts and labour borne by operators (Requirement; Compliance).","Cross‑jurisdictional provenance: directive responds to Transport Canada findings and references TC AD CF‑2005‑40, creating reliance on foreign AMO records (Background; Note)."],"plain_english_summary":"This Airworthiness Directive requires operators of specific Teledyne Continental reciprocating engines—those overhauled, repaired or disassembled by B.C. Aero Engines Ltd. between 1 Feb 2002 and 18 Jul 2004—to review engine records and inspect affected engines for improper crankcase work and related defects, and to restore conformity where needed. It matters because Transport Canada found non‑conforming overhauls that could cause in‑flight engine failure, so operators must act within short, prescribed timeframes to confirm and fix defects."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific maintenance quality failure by a specific approved maintenance organization during a defined time period. The scope remains precisely focused on identifying and rectifying non-conforming engine overhauls from B.C. Aero Engines Ltd."},"complexity_factors":["Multiple overlapping deadlines based on aircraft type (single vs twin engine) and whether problems already exist","Specific date range applicability (1 February 2002 to 18 July 2004) requiring logbook verification","Technical aviation terminology requiring some domain knowledge (crankcase halves, split-line sealant, fretting, through-bolt torque, AMO)","Cross-reference to Canadian regulation (Transport Canada AD CF-2005-40)","Conditional logic: 'if X, then Y; if not X, then no action required'"],"plain_english_summary":"CASA requires owners/operators of Teledyne Continental Motors piston engines to check whether B.C. Aero Engines Ltd. split and serviced their crankcase between Feb 2002 and July 2004. If so, they must carry out prompt inspections (with shorter deadlines for single‑engine aircraft) because Transport Canada found excessive sealant, fretting, loose bolts and unapproved repairs that can cause oil leaks and catastrophic engine failure in flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-con-85-improper-maintenance","history":"/api/acts/ad-con-85-improper-maintenance/history","analysis":"/api/acts/ad-con-85-improper-maintenance/analysis","conflicts":"/api/acts/ad-con-85-improper-maintenance/conflicts","importantCases":"/api/acts/ad-con-85-improper-maintenance/important-cases","documents":"/api/acts/ad-con-85-improper-maintenance/documents"}}