{"id":"F2007L02676","name":"AD/BO 105/22 - Main Rotor Mast Flange","slug":"ad-bo-105-22-main-rotor-mast-flange","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":68550,"registerId":"commonwealth-F2007L02676-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Eurocopter BO 105 Series Helicopters","sectionType":"division","heading":"Eurocopter BO 105 Series Helicopters","content":"### Eurocopter BO 105 Series Helicopters\n\n| AD/BO 105/22 | Main Rotor Mast Flange | 10/2007 |\n| ------------ | ---------------------- | ------- |\n\n| Applicability: | All Eurocopter Canada Model BO 105 LS A-3 helicopters.                                                                                                  |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the requirements of Transport Canada AD CF-97-18.Note: Eurocopter Canada Alert Service Bulletin No. ASB-BO 105LS-10-9 refers. |\n| Compliance:    | At intervals not to exceed 100 flight hours.                                                                                                            |\n|                | This Airworthiness Directive becomes effective on 27 September 2007.                                                                                    |\n| Background:    | Cracks of critical magnitude have been found on the main rotor mast flange of a Eurocopter Deutschland Model BO 105 helicopter.                         |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n13 August 2007","sortOrder":0},{"sectionNumber":"AD/BO 105/22","sectionType":"part","heading":"AD/BO 105/22","content":"## AD/BO 105/22","sortOrder":1},{"sectionNumber":"Main Rotor Mast Flange","sectionType":"part","heading":"Main Rotor Mast Flange","content":"## Main Rotor Mast Flange","sortOrder":2},{"sectionNumber":"10/2007","sectionType":"part","heading":"10/2007","content":"## 10/2007","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2537},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive addresses a discrete, specific technical safety issue (rotor mast flange cracks) and has not expanded beyond its original mechanical inspection purpose."},"complexity_factors":["Single, unambiguous compliance requirement referencing one external technical standard","No defined terms or interpretive provisions within the instrument","Simple periodic compliance interval (100 flight hours) with no exceptions, conditional triggers, or alternative compliance methods"],"plain_english_summary":"**What this is:** A safety order (Airworthiness Directive) requiring helicopter operators to inspect the **main rotor mast flange** on specific **Eurocopter BO 105 LS A-3** helicopters.\n\n**The safety issue:** Cracks have been discovered in the metal flange that connects the main rotor to the helicopter body. If this component fails during flight, the rotor could detach, causing a catastrophic accident.\n\n**What you must do:** Follow the inspection and maintenance instructions in the Canadian safety document **Transport Canada AD CF-97-18**. You must complete these checks **every 100 hours of flight time**.\n\n**Who must comply:** Owners and operators of Eurocopter Canada Model BO 105 LS A-3 helicopters operating in Australia."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bo-105-22-main-rotor-mast-flange","history":"/api/acts/ad-bo-105-22-main-rotor-mast-flange/history","analysis":"/api/acts/ad-bo-105-22-main-rotor-mast-flange/analysis","conflicts":"/api/acts/ad-bo-105-22-main-rotor-mast-flange/conflicts","importantCases":"/api/acts/ad-bo-105-22-main-rotor-mast-flange/important-cases","documents":"/api/acts/ad-bo-105-22-main-rotor-mast-flange/documents"}}