{"id":"F2007L01359","name":"AD/SA 315/17 - Main Gearbox - Freewheel Coupling Bolts","slug":"ad-sa-315-17-main-gearbox-freewheel-coupling-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":65637,"registerId":"commonwealth-F2007L01359-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Eurocopter SA 315 (Lama) Series Helicopt","sectionType":"division","heading":"Eurocopter SA 315 (Lama) Series Helicopters","content":"### Eurocopter SA 315 (Lama) Series Helicopters\n\n| AD/SA 315/17 | Main Gearbox - Freewheel Coupling Bolts | 6/2007 |\n| ------------ | --------------------------------------- | ------ |\n\n| Applicability: | Eurocopter SA315 helicopters.                                                                                                                                                                                                           |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Carry out a torque check of the bolts, Part Number (P/N) 3130S.62.02.012.1 attaching the freewheel ring gear, P/N 3130S.62.22.050, to the coupling flange, P/N 3160S.62.02.005, on the Main Gearbox (MGB).Note: DGAC AD 73-39-5 refers. |\n| Compliance:    | On new or overhauled MGB’s after 50 flight hours.                                                                                                                                                                                       |\n|                | This Airworthiness Directive becomes effective on 7 June 2007.                                                                                                                                                                          |\n| Background:    | Several cases of loose bolts have been discovered attaching the freewheel ring gear to the coupling flange on the MGB.                                                                                                                  |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n26 April 2007","sortOrder":0},{"sectionNumber":"AD/SA 315/17","sectionType":"part","heading":"AD/SA 315/17","content":"## AD/SA 315/17","sortOrder":1},{"sectionNumber":"Main Gearbox - Freewheel Coupling Bolts","sectionType":"part","heading":"Main Gearbox - Freewheel Coupling Bolts","content":"## Main Gearbox - Freewheel Coupling Bolts","sortOrder":2},{"sectionNumber":"6/2007","sectionType":"part","heading":"6/2007","content":"## 6/2007","sortOrder":3}],"analysis":{"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"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope is confined to Eurocopter SA315 helicopters and the specified freewheel coupling bolt assembly; it prescribes a single inspection requirement with a defined compliance trigger. The text does not expand or narrow that scope beyond the stated applicability and timing."},"complexity_factors":["Narrow applicability to a single helicopter model and specific part numbers (P/Ns).","Single, discrete maintenance action (torque check) with a clear compliance trigger (50 flight hours on new/overhauled MGB).","Key technical detail (exact torque value or procedure) is not specified in the text, requiring reference to maintenance data or manufacturer guidance.","Possible follow-on work (re-torquing, bolt replacement, additional inspections) is implied but not detailed, adding operational variance.","Cross-reference to DGAC AD 73-39-5 requires consulting an external regulatory document for full context.","Effective date and timing impose scheduling and record‑keeping burdens on operators and maintenance providers."],"plain_english_summary":"AD/SA 315/17 requires operators of Eurocopter SA315 (Lama) helicopters to perform a torque check on bolts P/N 3130S.62.02.012.1 that secure the freewheel ring gear (P/N 3130S.62.22.050) to the coupling flange (P/N 3160S.62.02.005) on the main gearbox. The check must be done on new or overhauled MGBs after 50 flight hours (effective 7 June 2007) because loose bolts were found. Helicopter owners/operators pay for compliance; licensed maintenance personnel must decide and carry out the check and any corrective work (AD/SA 315/17)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a narrow, specific safety purpose. It has not expanded beyond its original intent of addressing loose bolts in a specific helicopter model's gearbox."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 4 specific part numbers referenced","Single compliance requirement with one condition (50 flight hours)","No defined terms section","No cross-references to other legislation (only a note referencing a French aviation authority document)","Simple structure: applicability, requirement, compliance, background"],"plain_english_summary":"This CASA Airworthiness Directive requires operators of Eurocopter SA 315 “Lama” helicopters to inspect and verify torque of specific main gearbox bolts (freewheel ring gear to coupling flange) after 50 flight hours on any new or overhauled gearbox. It addresses reported loose bolts that could cause catastrophic gearbox failure, loss of power or control, and is a mandatory preventive safety measure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sa-315-17-main-gearbox-freewheel-coupling-bolts","history":"/api/acts/ad-sa-315-17-main-gearbox-freewheel-coupling-bolts/history","analysis":"/api/acts/ad-sa-315-17-main-gearbox-freewheel-coupling-bolts/analysis","conflicts":"/api/acts/ad-sa-315-17-main-gearbox-freewheel-coupling-bolts/conflicts","importantCases":"/api/acts/ad-sa-315-17-main-gearbox-freewheel-coupling-bolts/important-cases","documents":"/api/acts/ad-sa-315-17-main-gearbox-freewheel-coupling-bolts/documents"}}