Agusta A109 Series Helicopters
Agusta A109 Series Helicopters
Agusta A109 Series Helicopters
| AD/A109/53 | Tail Rotor - Flange Assembly | 7/2006 TX |
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| Applicability: | Agusta A109S helicopters up to S/N 22010 except S/N 22007, where maintenance activity has been carried out at least once on the Flange Assembly P/N109-0131-33-105 of the Tail Rotor Trunnion P/N 109-0131-30-101. |
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| Requirement: | Check the torque applied to the Flange P/N 109-0131-33-105 in accordance with Agusta Alert “Bollettino Tecnico” 109S-2 or later approved revision.Note: EASA Emergency AD 2006-0120-E dated 15 May 2006 refers. |
| Compliance: | Before further flight after the effective date of this AD. |
| This Airworthiness Directive becomes effective on 18 May 2006. | |
| Background: | The failure of the threaded pin of Trunnion P/N 109-0131-30-101 on an Agusta A109S caused the subsequent loss of the connected Flange P/N 109-0131-33-105, resulting in a sudden and noticeable increase in the vibration level. An investigation showed that the pin is likely to break due to over-torquing of Flange P/N109-0131-33-105 during maintenance. |
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James Coyne
Delegate of the Civil Aviation Safety Authority
16 May 2006