{"id":"F2006B06663","name":"AD/ROTAX/16 - Inspect/Replace Engine Mount","slug":"ad-rotax-16-inspect-replace-engine-mount","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48616,"registerId":"commonwealth-F2006B06663-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nRotax Piston Engines","sortOrder":0},{"sectionNumber":"AD/ROTAX/16 Inspect/Replace Engine Mount","sectionType":"part","heading":"AD/ROTAX/16 Inspect/Replace Engine Mount 12/2003","content":"# AD/ROTAX/16 Inspect/Replace Engine Mount 12/2003\n\nApplicability: Rotax 912 A/F/S series and Rotax 914 F series engines equipped with Rotax engine mount Part Number (P/N) 886567 and having serial numbers as detailed in Rotax SB- 912-028R1/SB-914-016R1.\n\nRequirement: 1. Initially, inspect the engine mount and thereafter repeat the inspection in accordance with instructions contained in Rotax Service Bulletin (SB) 912- 028R1 or Rotax SB 914-016R1, as appropriate.\n\n2. If cracks are detected when carrying out Requirement 1, replace engine mount with P/N 886568 Rotax engine mount in accordance with instructions contained in Rotax SB 912-028R1 or Rotax SB 914-016R1, as appropriate.","sortOrder":1},{"sectionNumber":"Terminating Action","sectionType":"part","heading":"Terminating Action","content":"## Terminating Action\n\nReplacement of the engine mount, as required by Requirement 2 of this Directive, constitutes compliance with the initial inspection and repeat inspections required by Requirement 1 this Directive.\n\nNote 1: Reference to ferry flight approval contained in the Requirement documents of this Directive DOES NOT automatically constitute approval for Australian registered aircraft.\n\nNote 2: Austrian CAA AD 105R1 refers.\n\nCompliance: For Requirement 1: Every 100 hours time-in-service (TIS) from the effective date of this Directive.\n\nFor Requirement 2: Before further flight.\n\nThis Airworthiness Directive becomes effective on 27 November 2003.","sortOrder":2},{"sectionNumber":"Rotax Piston Engines","sectionType":"part","heading":"Rotax Piston Engines","content":"## Rotax Piston Engines\n\nAD/ROTAX/16 (continued)\n\nBackground: Cracks have been detected on Rotax engine mount P/N 886567 which could have been caused by a number of reasons outlined in the SB’s relevant to this Directive. The intent of this Directive is to inspect the engine mount at regular intervals until the engine mount is replaced by Rotax engine mount P/N 886568.\n\n![Signature of Jim Coyne Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nJim Coyne\n\nDelegate of the Civil Aviation Safety Authority 14 October 2003\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 5 November 2003.","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive sticks to its original safety-focused purpose: detect cracks on a specified engine mount and remove affected parts by requiring replacement with a specific P/N. It does not broaden applicability beyond the P/N and serial numbers listed in the referenced Service Bulletins, nor does it add unrelated obligations. The instrument’s scope remains limited to inspection until replacement and the terminating action described."},"complexity_factors":["Short document with limited sections (Applicability, Requirement 1 & 2, Terminating Action, Compliance, Background)","Single conditional: 'if cracks are detected, replace before further flight' (simple branching)","Cross-reference to external documents: Rotax Service Bulletins SB-912-028R1 and SB-914-016R1 for inspection/replacement procedures and serial-number lists","Applicability limited by specific part number (P/N 886567) and serial numbers listed only in the SBs (requires operators to consult SBs to determine if affected)","Termination mechanism: replacement with P/N 886568 removes inspection obligation (single explicit exception)","Operational timing condition: 100 hours TIS inspection interval","Note restricting automatic acceptance of ferry-flight permissions (administrative interaction with CASA)"],"plain_english_summary":"**What this instrument does (mechanically)\n\n- Applies to aircraft fitted with Rotax 912 A/F/S or Rotax 914 F engines that use the Rotax engine mount Part Number (P/N) 886567 and whose serial numbers are listed in Rotax Service Bulletin SB-912-028R1 or SB-914-016R1.  \n\n- Requires an initial inspection of that engine mount and repeat inspections thereafter according to the procedures and intervals set out in the applicable Rotax Service Bulletin (Requirement 1).  \n\n- If any crack is found during an inspection, the engine mount must be replaced with Rotax P/N 886568 before the aircraft may fly again (Requirement 2).  \n\n- Replacing the mount with P/N 886568 is a terminating action: once replaced, the inspection cycle required by this Directive no longer applies to that mount.  \n\n- The inspection interval specified by the Directive is every 100 hours time-in-service (TIS) from the AD’s effective date; replacement is required before further flight if cracks are detected.  \n\n- A note clarifies that any ferry-flight permission referenced in the Rotax documents does not automatically grant permission for Australian-registered aircraft.\n\nWho is affected\n\n- Owners and operators of Australian-registered aircraft (and their maintenance organisations) that have the specified Rotax 912/914 engines installed with engine mount P/N 886567 and the serial numbers listed in the noted Rotax Service Bulletins.  \n\nWho pays and who decides\n\n- The aircraft owner/operator pays for inspections, maintenance labour, parts (replacement mount P/N 886568) and any aircraft downtime.  \n\n- The Civil Aviation Safety Authority (CASA) delegate issued the Directive under CASR subregulation 39.1(1); compliance is mandatory for affected Australian-registered aircraft.\n\nWhy the Directive was issued (official rationale and mechanical test)\n\n- Officially: cracks were detected on engine mounts P/N 886567. The stated intent is to detect and correct that unsafe condition by requiring inspections until the mount is replaced by P/N 886568.  \n\nPractical effects, trade-offs and implementation considerations\n\n- Safety mechanism: periodic inspections aim to detect fatigue/crack development early; mandatory replacement if cracked removes the defective part from service.  \n\n- Direct costs: inspection labour every 100 TIS, potential earlier replacement if cracks are found, parts cost for P/N 886568, and aircraft downtime during inspection/repair. These are borne by owners/operators.  \n\n- Incentives: because replacement is a terminating action, operators have an incentive to replace the mount to avoid ongoing inspection costs and operational risk of recurrent inspections.  \n\n- Supply and availability risk: compliance depends on availability of the approved replacement mount (P/N 886568) and competent maintenance resources able to follow the Rotax Service Bulletin instructions.  \n\n- Administrative/compliance burden: operators must follow the external Rotax Service Bulletin procedures (the Directive cross-references those SBs), keep records of inspections and any replacement, and ensure no further flight when a crack is found.  \n\n- Operational constraint: the AD prevents further flight if a crack is detected until the mount is replaced; any ferry-flight allowances in the SB do not automatically apply in Australia.  \n\n- Market effects: the immediate, concentrated benefit accrues to suppliers of the approved replacement mount (P/N 886568) and to maintenance organisations selling inspection/repair services. The cost is diffuse across affected aircraft owners/operators.\n\nImplementation risk and discretion\n\n- The Directive relies on the detailed procedures in the Rotax Service Bulletins for how inspections and replacements are performed; that external dependence increases operational complexity (operators must consult the SBs).  \n\n- Enforcement and approval decisions (for example, whether to permit any exceptional ferry flight) remain subject to CASA processes rather than being automatically granted by the foreign SBs.\n\nBottom line\n\n- Mechanically simple: inspect every 100 hours; if you find a crack, you must replace the mount with the specified P/N before the aircraft flies again; replacing the mount ends the inspection requirement. The operator bears the cost and responsibility for compliance.  \n\n(References: Requirement 1 and Requirement 2 of the Directive; Compliance section; Terminating Action and Notes.)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific safety defect in specific Rotax engine mounts. It has not expanded beyond its initial purpose of mandating inspections and replacement for the identified unsafe condition."},"complexity_factors":["Single, clearly defined applicability (specific engine models and part numbers)","Only two operational requirements with straightforward conditional logic (inspect; replace if cracked)","Simple compliance timeline (every 100 hours; immediate if cracked)","Minimal cross-referencing (only to specific Rotax Service Bulletins)","No nested exceptions or complex defined terms","Terminating action clearly specified","Short document (approximately 300 words of substantive content)"],"plain_english_summary":"This CASA Airworthiness Directive orders owners/operators of light aircraft with Rotax 912 A/F/S and 914 F series engines fitted with engine mount P/N 886567 to inspect those mounts for cracks every 100 flight hours, and to replace any cracked mount before further flight. Replacing the mount with the improved P/N 886568 removes the inspection requirement.\n\nIt affects aircraft owners/operators and maintenance engineers. The rule addresses discovered cracks that could allow in‑flight engine detachment, preventing a potentially catastrophic failure."},"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-rotax-16-inspect-replace-engine-mount","history":"/api/acts/ad-rotax-16-inspect-replace-engine-mount/history","analysis":"/api/acts/ad-rotax-16-inspect-replace-engine-mount/analysis","conflicts":"/api/acts/ad-rotax-16-inspect-replace-engine-mount/conflicts","importantCases":"/api/acts/ad-rotax-16-inspect-replace-engine-mount/important-cases","documents":"/api/acts/ad-rotax-16-inspect-replace-engine-mount/documents"}}