{"id":"F2008L01943","name":"AD/ROTAX/22 Amdt 1 - Camshaft Hydraulic Tappet Wear","slug":"ad-rotax-22-amdt-1-camshaft-hydraulic-tappet-wear","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74182,"registerId":"commonwealth-F2008L01943-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Rotax Piston Engines","sectionType":"division","heading":"Rotax Piston Engines","content":"### Rotax Piston Engines\n\n| AD/ROTAX/22 Amdt 1 | Camshaft Hydraulic Tappet Wear | 7/2008 |\n| ------------------ | ------------------------------ | ------ |\n\n| Applicability: | BRP-Rotax GmbH & Co. KG; Bombardier-Rotax GmbH & Co. KG; Bombardier-Rotax GmbH:Rotax 912 A series engines from serial number (S/N) 4,410.681 to S/N 4,410.712; andRotax 912 F series engines from S/N 4,412.912 to S/N 4,412.921; andRotax 912 S series engines from S/N 4,923.263 to S/N 4,923.380; andRotax 914 F series engines from S/N 4,420.595 to S/N 4,420.637; andAny S/N engine on which the camshaft and/or the hydraulic valve tappets have been replaced (e.g. during engine repair or general overhaul) after 1 January 2006 up to and including 1 December 2007.This AD is not applicable to Engines which have hydraulic valve tappets Part Number (P/N) 854.095 installed during production and engines which have (e.g. during engine repair or general overhaul) P/N 881.831 spare part kit installed, which includes hydraulic valve tappet P/N 854.095, are not affected by the requirements of this revised AD.Engines with P/N 854.095 hydraulic valve tappets installed prior to delivery byBRP-Rotax can be identified by (minor) modification number references for each specific engine design: 85-05 for 912 A; F50-05 for 912 F; S34-04 for 912 S; and F45-04 for 914 F engines. These reference numbers are documented in each individual engine Release Certificate.Note 1: The installation of these engines was either done by the respective aircraft manufacturer or through modification of the aircraft by Supplemental Type Certificate.The following S/N engines have already been inspected before first installation or first engine start up according to section 1.5 Compliance (a) of BRP-RotaxSB-912-051 and SB-914-034 respectively: |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n|              | Rotax 912 A series from S/N4,410.709 to S/N4,410.712;Rotax 912 F series from S/N4,412.920 to S/N4,412.921;Rotax 912 S series from S/N4,923.381 onwards; andRotax 914 F series from S/N4,420.633 to S/N4,420.637.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |\n| ------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Inspect the magnetic plug in accordance with BRP-Rotax ASB-912-051 orASB-914-034, both dated 13 October 2006, or later approved revision as is applicable.2. Repeat the inspection as detailed in Requirement 1 of this AD.3. If during the inspection detailed in Requirements 1 or 2 of this AD metal parts greater than 3mm are detected as detailed in Figure 1 and 2 of ASB-912-051 or ASB-914-034 both dated 13 October 2006, or later approved revision as is applicable, carry out investigation and rectification of the cause of the defect.4. Do not install an engine listed in the applicability section of this AD unless the magnetic plug has been inspected in accordance with the requirements detailed in Requirement 1 of this AD.Terminating ActionModification of the engine by installing P/N 881.831 spare part kit, which includes hydraulic valve tappet P/N 854.095, constitutes terminating action for the requirements of this AD.Note 2: EASA 2006-0316 R1 dated 13 March 2008 refers. This AD supersedes EASA AD 2006-316-E. |\n| Compliance:  | 1. Before further flight after the effective date of this AD, unless previously accomplished.2. Remains unchanged as detailed in the original issue of this AD as: Within 5 hours operation after 20 October 2006 (the effective date of the original issue of this AD but not later than 1 March 2007 and thereafter at every oil change.Note 3: Previous accomplishment with Requirement 2 of the original issue of this AD is considered acceptable to showing compliance with this AD.3. Before further flight.4. From the effective date of this AD.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n|              | This Amendment becomes effective on 3 July 2008.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |\n\n| Background: | Increased wear of the camshaft/hydraulic valve tappet can occur. This may lead to improper engine operation, power loss or in-flight engine failure.The manufacturer has introduced a new hydraulic tappet which does not require the inspections detailed in this AD. For that reason this amendment limits the requirements to those engines not fitted with P/N 854.095 hydraulic tappets. |\n| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n22 May 2008","sortOrder":0},{"sectionNumber":"AD/ROTAX/22 Amdt 1","sectionType":"part","heading":"AD/ROTAX/22 Amdt 1","content":"## AD/ROTAX/22 Amdt 1","sortOrder":1},{"sectionNumber":"Camshaft Hydraulic Tappet Wear","sectionType":"part","heading":"Camshaft Hydraulic Tappet Wear","content":"## Camshaft Hydraulic Tappet Wear","sortOrder":2},{"sectionNumber":"7/2008","sectionType":"part","heading":"7/2008","content":"## 7/2008","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"This amendment narrows the affected population by excluding engines fitted with hydraulic tappet P/N 854.095 (either at production or via spare kit P/N 881.831). The Background states the new tappet \"does not require the inspections detailed in this AD,\" and the Applicability section lists the serial ranges and replacement-date condition that remain subject to the AD, so the amendment limits requirements to engines not fitted with P/N 854.095."},"complexity_factors":["Multiple specific serial-number ranges across four engine families (912 A, 912 F, 912 S, 914 F) requiring cross-checking against airframe records.","Conditional applicability tied to whether camshaft and/or hydraulic valve tappets were replaced between 1 Jan 2006 and 1 Dec 2007.","Part-number carve-outs: engines with hydraulic tappet P/N 854.095 fitted in production, or engines fitted with spare kit P/N 881.831, are excluded from the inspection requirement.","Identification by (minor) modification reference numbers recorded on each engine Release Certificate (85-05, F50-05, S34-04, F45-04) adds administrative verification steps.","Staggered and mixed compliance timings: immediate 'before further flight' requirement for some actions, a prior 5-hour/’within every oil change’ schedule from the original AD for others, and a one-off pre-install inspection requirement.","A clear measurement threshold (>3 mm metal parts) triggers investigations and rectification, requiring judgement and possible disassembly/repair.","Terminating action (installing P/N 881.831 kit) changes long-term maintenance choices and cost/benefit decisions for owners."],"plain_english_summary":"Requires inspection of the engine's magnetic oil plug for metal particles on specified Rotax 912/914 engines (certain serial-number ranges and engines whose camshaft or hydraulic tappets were replaced between 1 Jan 2006 and 1 Dec 2007), repeating at oil changes, and corrective action if particles over 3 mm are found. It forbids installing an affected engine unless the inspection has been done. Installing the P/N 881.831 kit (which includes hydraulic tappet P/N 854.095) removes the inspection requirement. Affects owners, operators and maintenance organisations because tappet/camshaft wear can cause power loss or engine failure."},"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":4,"scope_assessment":{"changed":false,"description":"This is an amendment (Amdt 1) that narrows the original directive's scope rather than expanding it. The original AD applied more broadly; this version specifically excludes engines with improved hydraulic tappets (P/N 854.095) already installed, reducing the burden on compliant owners while maintaining safety requirements for affected engines."},"complexity_factors":["Multiple overlapping applicability criteria (serial number ranges, repair history, and part number exclusions)","Cross-references to external manufacturer documents (ASB-912-051, ASB-914-034, SB-912-051, SB-914-034) without reproducing their content","Nested conditional logic: exemptions based on part numbers, modification numbers, and prior inspection history","Four distinct compliance deadlines with different triggers (effective date, flight hours, calendar dates, oil change intervals)","Technical aviation terminology requiring specialized knowledge (magnetic plug, hydraulic tappet, terminating action, supplemental type certificate)"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of specified Rotax 912 A/F/S and 914 F engines (certain serials or those with cam/tappet work in 2006–2007) to inspect the oil magnetic plug for metal debris from camshaft–hydraulic tappet wear, repeating at every oil change. Engines fitted with improved tappet P/N 854.095 are exempt; finding particles >3 mm demands immediate investigation/repair, and fitting spare kit P/N 881.831 is a permanent fix that ends the inspection requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rotax-22-amdt-1-camshaft-hydraulic-tappet-wear","history":"/api/acts/ad-rotax-22-amdt-1-camshaft-hydraulic-tappet-wear/history","analysis":"/api/acts/ad-rotax-22-amdt-1-camshaft-hydraulic-tappet-wear/analysis","conflicts":"/api/acts/ad-rotax-22-amdt-1-camshaft-hydraulic-tappet-wear/conflicts","importantCases":"/api/acts/ad-rotax-22-amdt-1-camshaft-hydraulic-tappet-wear/important-cases","documents":"/api/acts/ad-rotax-22-amdt-1-camshaft-hydraulic-tappet-wear/documents"}}