{"id":"F2006L00352","name":"AD/LYC/114 - Improper Maintenance","slug":"ad-lyc-114-improper-maintenance","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116957,"registerId":"commonwealth-F2006L00352-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Lycoming Piston Engines","sectionType":"division","heading":"Lycoming Piston Engines","content":"### Lycoming Piston Engines\n\n| AD/LYC/114 | Improper Maintenance | 3/2006 |\n| ---------- | -------------------- | ------ |\n\n| Applicability: | All Textron Lycoming 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 Textron Lycoming 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/LYC/114","sectionType":"part","heading":"AD/LYC/114","content":"## AD/LYC/114","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":{"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. The scope remains precisely focused on engines worked on by the identified problematic maintenance organization during the specified timeframe. No scope creep is evident."},"complexity_factors":["Multiple compliance deadlines based on aircraft configuration (single vs twin engine) and prior service history (engines with known issues vs clean history)","Nested conditional logic: applicability depends on specific date range, specific maintenance organization, and specific type of maintenance performed (crankcase splitting)","Cross-reference to Canadian authority (Transport Canada AD CF-2005-40) for additional context","Technical aviation terminology requiring specialized knowledge (crankcase split-line sealant, through-bolt torque, AMO designation, time in service)","Dual trigger system for compliance timing: flight hours OR calendar days, whichever comes first"],"plain_english_summary":"This AD orders owners/operators of certain Lycoming piston engines overhauled or repaired by B.C. Aero Engines Ltd. (Feb 2002–Jul 2004) to check logbooks and inspect engines because the shop’s cancelled approvals and discovered quality defects (sealant misuse, crankcase damage, loose bolts, unapproved repairs) can lead to in‑flight engine failure.\n\nAffected operators must verify work, inspect for those defects promptly, and repair any issues to restore safe condition."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Scope is limited to engines overhauled, repaired or disassembled (crankcase split) by B.C. Aero Engines Ltd. in the specified date range and imposes inspection and repair obligations on affected owners/operators. The directive does not expand beyond that stated cohort or impose additional categories beyond the published applicability."},"complexity_factors":["Targeted applicability: limited to engines worked on by a single AMO within precise dates (adds identification burden).","Two inspection tracks: different procedures and time limits for single‑engine vs twin‑engine aircraft.","Staged compliance windows: varying time‑in‑service or calendar deadlines depending on prior symptoms (operational tracking required).","Remedial discretion: 'restore the engine’s conformity' may require varying repair scope and parts sourcing.","Record review requirement: audit of technical records/engine logbooks to establish applicability.","Cross‑jurisdictional origin: directive enforces issues discovered by Transport Canada for Australian-registered aircraft.","Reference to other AD (Transport Canada AD CF‑2005‑40) creates dependency on external documentation."],"plain_english_summary":"Requires owners/operators of Textron Lycoming piston engines overhauled, repaired or disassembled (crankcase split) by B.C. Aero Engines Ltd. between 1 Feb 2002 and 18 Jul 2004 to review records, inspect engines for specific non‑conformities (excess sealant, split‑line fretting, oil leaks, through‑bolt torque loss, unapproved repairs) and restore conformity where necessary. CASA issued the Airworthiness Directive (effective 16 Mar 2006) after Transport Canada flagged risk of in‑flight engine failure (Background). Owners/operators pay inspection/repair costs and must meet staged time‑in‑service or calendar deadlines (Requirement; Compliance)."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-lyc-114-improper-maintenance","history":"/api/acts/ad-lyc-114-improper-maintenance/history","analysis":"/api/acts/ad-lyc-114-improper-maintenance/analysis","conflicts":"/api/acts/ad-lyc-114-improper-maintenance/conflicts","importantCases":"/api/acts/ad-lyc-114-improper-maintenance/important-cases","documents":"/api/acts/ad-lyc-114-improper-maintenance/documents"}}