federal_register: E8-8642
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| document_number | title | type | abstract | publication_date | pub_year | pub_month | html_url | pdf_url | agency_names | agency_ids | excerpts | regulation_id_numbers |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| E8-8642 | Airworthiness Directives; Sikorsky Aircraft Corporation Model S-61A, D, E, L, N, NM, R, and V; Croman Corporation Model SH-3H, Carson Helicopters, Inc. Model S-61L; Glacier Helicopter Model CH-3E; Robinson AirCrane, Inc. Model CH-3E, CH-3C, HH-3C and HH-3E; and Siller Helicopters Model CH-3E and SH-3A Helicopters | Proposed Rule | This amendment proposes superseding an existing airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S- 61A, D, E, L, N, NM, R, and V helicopters. The existing AD currently requires determining whether the main rotor shaft (MRS) was used in repetitive external lift (REL) operations. The existing AD also requires a nondestructive inspection (NDI) for cracks, replacing any unairworthy MRS with an airworthy MRS, appropriately marking the MRS, making a logbook entry, and establishing retirement lives for each REL MRS. This proposed AD would contain some of the same requirements but would determine new retirement lives for each MRS. The REL retirement life would be based on hours time-in-service (TIS) or lift cycles, whichever occurs first. The Non-REL retirement life would be reduced and would only be based on hours TIS. This proposed AD would also require the operator to remove from service any MRS with oversized dowel pin bores. Also, certain restricted category models that were inadvertently omitted in the current AD would be added to the applicability. This proposed AD is prompted by the manufacturer's reevaluation of the retirement life for the MRS based on torque, ground-air-ground (GAG) cycle, and fatigue testing. The actions specified by the proposed AD are intended to prevent MRS structural failure, loss of power to the main rotor, and subsequent loss of control of the helicopter. | 2008-04-22 | 2008 | 4 | https://www.federalregister.gov/documents/2008/04/22/E8-8642/airworthiness-directives-sikorsky-aircraft-corporation-model-s-61a-d-e-l-n-nm-r-and-v-croman | https://www.govinfo.gov/content/pkg/FR-2008-04-22/pdf/E8-8642.pdf | Transportation Department; Federal Aviation Administration | 492,159 | This amendment proposes superseding an existing airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S- 61A, D, E, L, N, NM, R, and V helicopters. The existing AD currently requires determining whether the main rotor shaft... |