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AD/S-76/75 - Main Rotor Shaft - 2
Sikorsky S-76 Series HelicoptersSikorsky S-76 Series Helicopters
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Sikorsky S-76 Series Helicopters
| AD/S-76/75 | Main Rotor Shaft - 2 | 8/2007 DM |
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| Applicability: | Model S-76A, B, and C helicopters equipped with a main rotor shaft assembly listed below:a. Part number 76351-09030-all dash numbers, and with a following serial number:B015-00782 through B015-00791, B015-00811 through B015-00816,E015-00844 through E015-00865, and E015-00908 through E015-00918.b. Part number 76351-09630-041, and with a following serial number:C213-00436 through C213-00454, D213-00537 through D213-00545, andD213-00575 through D213-00585. |
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| Requirement: | Perform an ultrasonic inspection of the main rotor shaft assembly for cracking:1. For Model S-76A, B, and C helicopters equipped with a main rotor shaft assembly part number 76351-09630-041, remove and inspect the shaft assembly in accordance with the Accomplishment Instructions, paragraphs 3.B.(1)(a) through 3.B.(1)(d)5 of Sikorsky Alert Service Bulletin (ASB) No. 76-66-45A Revision A, dated 7 February 2007, or later FAA approved revision.2. For Model S-76A helicopters equipped with a main rotor shaft assembly part number 76351-09030-all dash numbers, remove and inspect the shaft assembly in accordance with the Accomplishment Instructions, paragraphs 3.B.(1)(a) through 3.B.(1)(d)5 of ASB No. 76-66-46, dated 7 February 2007, or later FAA approved revision.If a crack is detected, before further flight, replace the main rotor shaft assembly with a serviceable shaft assembly that has been ultrasonically inspected in accordance with Requirement 1 or 2, as applicable.Reassemble the lower bearing housing assembly, install the main gear box, and perform the ground run leak test in accordance with the Accomplishment Instructions, paragraphs 3.B.(1)(f) through 3.B.(1)(l) of ASB No. 76-66-45A Revision A or ASB No. 76-66-46, as applicable; or later FAA approved revision. |
| Before installing an affected main rotor shaft assembly, ultrasonically inspect the shaft assembly in accordance with Requirement 1 or 2, as applicable; reassemble the lower bearing housing assembly, install the main gearbox, and perform the ground leak test as specified in the previous Requirement paragraph.Note: FAA AD 2007-11-05 Amdt 39-15062 refers. | |
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| Compliance: | For Requirement 1 and 2: Within 75 hours time in service after 15 June 2007, unless already accomplished. |