{"id":"F2007L01053","name":"AD/CON/84 Amdt 3 - Starter Adapter Assembly","slug":"ad-con-84-amdt-3-starter-adapter-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":64999,"registerId":"commonwealth-F2007L01053-current","compilationNumber":null,"startDate":"2026-04-02","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/84 Amdt 3 | Starter Adapter Assembly | 5/2007 |\n| ---------------- | ------------------------ | ------ |\n\n| Applicability: | Teledyne Continental Motors (TCM) GTSIO-520 series reciprocating engines.Note 1: These engines are installed on, but not limited to, Twin Commander (formerly Aero Commander) model 685, Cessna model 404, 411 series, and 421 series, British Aerospace, Aircraft Group, Scottish Division model B.206 series 2 and Aeronautica Macchi model AM-3 airplanes. |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. For any engine that experiences rough running conditions regardless of time-in-service (TIS), perform the inspection procedures specified in Part 1 and Part 3 of Teledyne Continental Motors (TCM) Mandatory Service Bulletin (MSB) No. MSB94-4G dated 31 October 2005 or later FAA approved revisions, and replace components as necessary.An engine is considered rough-running if there is a sudden increase in the perceived vibration levels that cannot be cleared by adjustment of the engine controls; particularly the fuel mixture setting. Information on rough running engines can be found in the aircraft manufacturer's Airplane Flight Manual, Pilot's Operating Handbook, or Aircraft Owners Manual.Special flight permits are prohibited for rough-running engines described in this AD.2. Perform the inspection procedures specified in Part 2 of MSB94-4G or later FAA approved revisions, and replace components as necessary.3. Perform the inspection procedures specified in Part 3 of MSB94-4G or later FAA approved revisions, and replace components as necessary.4. Install TCM service kit, P/N EQ6642 (new) or EQ6642R (rebuilt), using the service kit installation procedures specified in Part 5 of MSB94-4G dated31 October 2005 or later FAA approved revisions.Note 2: Installation of the service kit does not constitute terminating action for the inspection and component replacements detailed in other requirements of this AD. |\n\n| | 5. If, during an inspection in accordance with Requirement 1, 2 or 3 of this AD, you find needle bearing P/N 537721, installed in the crankcase, replace it with a serviceable bushing P/N 654472 or equivalent approved bearing. Use the bushing installation procedure specified in Part 4 of TCM MSB94-4G or later FAA approved revisions.Note 3: FAA Airworthiness Directive AD 2007-05-15 Amendment 39-14976 dated12 March 2007 refers. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Compliance: | 1. Before further flight.2. For any engine that has been inspected earlier in accordance with the instructions of this AD at any revision status:Continue the inspections at the next 100-hours time-in-service (TIS) inspection or annual inspection, whichever occurs first after the effective date of this AD. Thereafter, repeat the inspections at each 100-hours TIS inspection, (plus or minus 10 hours) or annual inspection, whichever occurs first.For any engine that has NOT been inspected earlier:Within 25 hours TIS or annual inspection, which ever occurs first, after the effective date of this AD. Thereafter, repeat the inspections at each 100-hours TIS inspection (plus or minus 10 hours) or annual inspection, whichever occurs first.3. For any starter adapter with 400 hours or more TIS or unknown TIS on the effective date of this AD:Unless previously accomplished, carry out within 25 hours TIS after the effective date of this AD and repeatedly thereafter, at intervals not to exceed 400-hours TIS (plus or minus 10 hours).For any starter adapter with less than 400 hours TIS on the effective date of this AD:Upon accumulation of 400 hours TIS (plus or minus 10 hours), and repeatedly thereafter, at intervals not to exceed 400-hours TIS (plus or minus 10 hours).4. Unless previously accomplished, carry out at the next engine overhaul or starter adapter replacement after the effective date of this AD, whichever occurs first.5. Before reassembling components. |\n\n| | This Amendment becomes effective on 10 May 2007. |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Background: | This AD results from six service difficulty reports and one fatal accident report received related to the failed starter adapter assemblies. The actions detailed in this AD are intended to prevent failure of the starter adapter assembly and / or crankshaft gear, resulting in failure of the engine and possible forced landing.The current amendment makes reference to the latest revision of TCM service documents and the latest FAA AD 2007-05-15.The Amendment 2 of this AD became effective on 22 December 2005.The Amendment 1 of this AD became effective on 2 November 2005. |\n\n![](image.001.png) \nCharles Lenarcic \nDelegate of the Civil Aviation Safety Authority\n\n27 March 2007","sortOrder":0},{"sectionNumber":"AD/CON/84 Amdt 3","sectionType":"part","heading":"AD/CON/84 Amdt 3","content":"## AD/CON/84 Amdt 3","sortOrder":1},{"sectionNumber":"Starter Adapter Assembly","sectionType":"part","heading":"Starter Adapter Assembly","content":"## Starter Adapter Assembly","sortOrder":2},{"sectionNumber":"5/2007","sectionType":"part","heading":"5/2007","content":"## 5/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"This amendment updates references to the latest TCM service bulletin revisions and to FAA AD 2007‑05‑15. It does not introduce new engine models but alters which revision of external service documents governs the inspection and replacement procedures, thereby changing the authoritative sources for compliance rather than the core safety objective."},"complexity_factors":["Dependence on external documents and later FAA‑approved revisions (TCM MSB94‑4G; FAA AD 2007‑05‑15) creating dynamic compliance references.","Multiple conditional requirements (Requirements 1–5) tied to different trigger events: rough running, part TIS thresholds, overhaul/replacement.","Several overlapping time intervals and repetition rules (before further flight; within 25 hours; every 100 hours ±10; every 400 hours ±10).","Explicit part‑numbered parts and kits (EQ6642/EQ6642R, P/N 537721, P/N 654472) requiring part‑specific replacements or approved equivalents.","Procedural sequencing constraints (inspections, replacement, bushing installation before reassembly) increasing maintenance planning complexity.","Operational restriction (prohibition of special flight permits for rough‑running engines) that affects decision‑making about ferrying aircraft.","Ongoing compliance burden because kit installation does not terminate other inspection/repair requirements, implying repeated actions and recordkeeping."],"plain_english_summary":"Requires inspections and, where necessary, replacement of starter‑adapter assemblies and related components on Teledyne Continental Motors GTSIO‑520 engines, using the procedures in TCM Mandatory Service Bulletin MSB94‑4G (or later FAA‑approved revisions). Applies to operators and maintenance organisations of the listed aircraft types; inspections are required for rough‑running engines before further flight and at mandated intervals, certain bearings must be replaced before reassembly, and special flight permits for rough‑running engines are prohibited. The stated aim is to prevent starter adapter or crankshaft gear failure and possible engine loss."},"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 Amendment 3 of an existing Airworthiness Directive (AD/CON/84). The amendments appear to maintain the original safety purpose — preventing starter adapter failures — while updating technical references to the latest manufacturer service bulletins and FAA directives. The scope remains focused on the specific TCM engine series and the specific mechanical defect."},"complexity_factors":["Multiple overlapping compliance timelines based on engine history (whether previously inspected or not, hours flown, overhaul status)","Cross-references to external technical documents (TCM Mandatory Service Bulletin MSB94-4G and FAA AD 2007-05-15) that are not reproduced in the text","Five distinct requirements with different compliance triggers and intervals","Technical aviation terminology requiring specialized knowledge (TIS = Time-In-Service, P/N = Part Number, MSB = Mandatory Service Bulletin)","Conditional logic: different rules apply depending on whether engine has 400+ hours, unknown hours, or less than 400 hours; whether previously inspected; rough-running vs normal operation","Note clarifications that create exceptions (e.g., Note 2 states that installing the service kit does NOT end the inspection obligations)"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires owners/operators of aircraft with Teledyne Continental Motors GTSIO-520 engines (used in Twin Commander, Cessna 404/411/421 series, etc.) to inspect and, where needed, repair or replace starter-adapter components to stop starter adapter assembly failures that can cause engine loss.\n\nInspections are required immediately for “rough running” engines and on recurring intervals, with certain parts replaced and a specific service kit fitted at overhaul—compliance is legally required to prevent catastrophic failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-con-84-amdt-3-starter-adapter-assembly","history":"/api/acts/ad-con-84-amdt-3-starter-adapter-assembly/history","analysis":"/api/acts/ad-con-84-amdt-3-starter-adapter-assembly/analysis","conflicts":"/api/acts/ad-con-84-amdt-3-starter-adapter-assembly/conflicts","importantCases":"/api/acts/ad-con-84-amdt-3-starter-adapter-assembly/important-cases","documents":"/api/acts/ad-con-84-amdt-3-starter-adapter-assembly/documents"}}