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AD/S-92/1 - Main Transmission Mounting Bolts
Sikorsky S-92 Series HelicoptersSikorsky S-92 Series Helicopters
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Sikorsky S-92 Series Helicopters
| AD/S-92/1 | Main Transmission Mounting Bolts | 1/2007 |
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| Applicability: | Model S-92A helicopters, with main transmission mounting bolt part number SS5211-10-47, installed. |
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| Requirement: | Open the No. 1 and No. 2 engine work platforms to gain access to the main transmission mounting bolts. Remove each bolt, one at a time, and visually inspect the bolt shank and threads for wear or corrosion in accordance with paragraphs 3.A.(6)(a) of the Accomplishment Instructions in Sikorsky Aircraft Corporation Alert Service Bulletin No. 92-63-003, dated 1 February 2006.If wear or corrosion is detected, before further flight, replace an affected bolt, as well as the bolt barrel nut and cage, with a serviceable bolt part number SS5211-10-47, barrel nut part number RMLH2577-108, and cage part number NAS578-10B.Note: FAA AD 2006-11-14 Amdt 39-14618 refers. |
| Compliance: | Within 100 hours time in service after 18 January 2006, unless accomplished within the last 500 hours time in service. |
| This Airworthiness Directive becomes effective on 18 January 2007. | |
| Background: | The FAA received a report of a failure of a main transmission mounting bolt, detected during routine maintenance inspection. Undetected bolt failure could result in loss of support of the main transmission, and subsequent loss of control of the helicopter. |
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David Villiers
Delegate of the Civil Aviation Safety Authority
23 November 2006