{"id":"F2006L01093","name":"AD/CONVAIR/13 - Main Landing Gear Trunnion Fittings","slug":"ad-convair-13-main-landing-gear-trunnion-fittings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":58435,"registerId":"commonwealth-F2006L01093-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Kelowna Flightcraft (General Dynamics/Co","sectionType":"division","heading":"Kelowna Flightcraft (General Dynamics/Convair) Series Aeroplanes","content":"### Kelowna Flightcraft (General Dynamics/Convair) Series Aeroplanes\n\n| AD/CONVAIR/13 | Main Landing Gear Trunnion Fittings | 5/2006 |\n| ------------- | ----------------------------------- | ------ |\n\n| Applicability: | Model 340 and 440 aircraft, and all such model aircraft converted to turbopropeller power.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Visually inspect main landing gear trunnion fittings part number 340-8510109 for crack indications in the outboard fitting face and inboard boss area, primarily in the upper area of the fitting above the boss radius, by dye penetrant inspection procedures, in accordance with General Dynamics 640 (340D) Service Bulletin No. 57-4, dated 25 May 1970.2. If no cracks are detected, repeat the Requirement 1 inspection procedure.3. If cracks are detected during any Requirement 1 inspection, accomplish one of the following:a. If trunnion fitting cracking exceeds 2-inches or if a crack is detected in the trunnion boss face, replace the fitting before further flight.b. If cracking is in excess of 1-inch in length but less than 2-inches in length, either replace the fitting or stop-drill using a 0.25-inch drill and reinspect daily for crack growth until the fitting is replaced.c. If cracking is 1-inch in length or less, either replace the fitting or stop-drill using a 0.25-inch drill and reinspect for crack growth at intervals not to exceed 50 hours time in service.Note 1: Where insufficient clearance precludes the use of a 0.25-inch drill, it is permissible to use a 0.1875-inch drill.4. Replace stop-drilled fittings.Any crack progressing beyond a stop-drilled hole may be stop-drilled again if the total crack length is less than 2-inches. This fitting must be replaced if a crack progresses to 2-inches or more in length.Note 2: FAA AD 70-12-05 refers. |\n\n| Compliance: | 1. Unless the initial inspection is already accomplished, within 50 hours time in service after 11 May 2006 unless accomplished within the last 450 hours time in service.2. At intervals not to exceed 500 hours time in service.3. Before further flight.4. Within 500 hours time in service from initial stop-drilling. |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|             | This Airworthiness Directive becomes effective on 11 May 2006.                                                                                                                                                                                                                                                             |\n| Background: | The FAA requires inspections to detect cracks and prevent failure of the main landing gear trunnion fittings.                                                                                                                                                                                                              |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n29 March 2006","sortOrder":0},{"sectionNumber":"AD/CONVAIR/13","sectionType":"part","heading":"AD/CONVAIR/13","content":"## AD/CONVAIR/13","sortOrder":1},{"sectionNumber":"Main Landing Gear Trunnion Fittings","sectionType":"part","heading":"Main Landing Gear Trunnion Fittings","content":"## Main Landing Gear Trunnion Fittings","sortOrder":2},{"sectionNumber":"5/2006","sectionType":"part","heading":"5/2006","content":"## 5/2006","sortOrder":3}],"analysis":{"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 a standard Airworthiness Directive maintaining its original scope — mandatory safety inspection of a specific aircraft component. The document shows no evidence of scope creep; it addresses exactly what the title and background describe: preventing trunnion fitting failure through prescribed inspection and repair protocols."},"complexity_factors":["Multiple conditional branches based on crack length measurements (4 distinct thresholds: ≤1 inch, 1-2 inches, ≥2 inches, and boss face location)","Nested exception in Note 1 permitting alternative drill size (0.1875-inch vs standard 0.25-inch) when clearance is insufficient","Cross-reference to external technical document (General Dynamics Service Bulletin No. 57-4) for inspection procedures","Multiple compliance timelines operating in parallel (initial inspection deadline, recurring 500-hour intervals, immediate grounding trigger, 500-hour replacement deadline for stop-drilled fittings)","Reference to corresponding FAA AD 70-12-05 indicating harmonised international regulatory approach","Specific part number identification (340-8510109) requiring technical aircraft knowledge to locate"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Convair 340/440 (including turboprop conversions) to inspect the main landing gear trunnion fitting for cracks using dye-penetrant checks and to repeat inspections at regular intervals. Detected cracks must be addressed — large or critical cracks require immediate replacement, while smaller cracks may be temporarily managed by stop‑drilling with mandated monitoring and eventual replacement.\n\nThe AD prevents possible landing gear collapse and aligns with an FAA directive; it affects Australian operators of these vintage aircraft."},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":false,"description":"The instrument applies to Convair Model 340 and 440 aircraft (including turboprop conversions) and references FAA AD 70‑12‑05; the text does not expand or narrow the stated applicability beyond that referenced FAA action and thus does not indicate a change in scope from the referenced requirement (Applicability; Note 2)."},"complexity_factors":["Technical inspection method required (dye penetrant) and identification of specific areas to inspect (outboard fitting face and inboard boss area) — technical skill and access required (Requirement 1).","Multiple conditional remediation options with measured thresholds (<=1\", >1\" and <2\", >=2\") that trigger different actions (replace, stop‑drill, reinspect) — increases decision complexity for operators (Requirement 3a–3c).","Several distinct compliance timeframes: initial inspection window (within 50 hours unless done in last 450), recurring interval (500 hours), daily reinspections in some cases, and ‘before further flight’ mandatory action for large cracks (Compliance 1–4).","Allowance for alternate drill size where clearance is insufficient (0.1875\" instead of 0.25\") introduces judgement calls in the field and potential variability in mitigation effectiveness (Note 1, Requirement 3b/c).","Stop‑drill management rules (replace stop‑drilled fittings within 500 hours; permitted re‑stop‑drilling if total length remains <2\") create ongoing monitoring and recordkeeping obligations (Requirement 4, Compliance 4).","Cross‑reference to FAA AD 70‑12‑05 (Note 2) links domestic requirements to an external regulatory document, which may require operators to consult additional material.","Applicability includes both original models and all such aircraft converted to turboprop power, broadening the operator base and parts/maintenance commonality considerations (Applicability).","Operational impact: mandatory ‘before further flight’ replacements for certain cracks can cause immediate grounding and unscheduled maintenance costs and downtime (Requirement 3a, Compliance 3)."],"plain_english_summary":"AD/CONVAIR/13 requires dye‑penetrant inspections of the main landing gear trunnion fitting (P/N 340-8510109) on Convair Model 340/440 aircraft (including turboprop conversions), and sets mandatory repair rules: replace or stop‑drill cracks based on measured length and reinspect at specified intervals. (See Requirement & Compliance.)\n\nThe stated aim is to detect cracks and prevent fitting failure; operators pay for inspections, stop‑drilling and replacements, and must meet short recurring inspection intervals and “before further flight” replacement triggers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-convair-13-main-landing-gear-trunnion-fittings","history":"/api/acts/ad-convair-13-main-landing-gear-trunnion-fittings/history","analysis":"/api/acts/ad-convair-13-main-landing-gear-trunnion-fittings/analysis","conflicts":"/api/acts/ad-convair-13-main-landing-gear-trunnion-fittings/conflicts","importantCases":"/api/acts/ad-convair-13-main-landing-gear-trunnion-fittings/important-cases","documents":"/api/acts/ad-convair-13-main-landing-gear-trunnion-fittings/documents"}}