Agencies mandate new inspections for S-92 gearbox | Aviation International News

Regulations and Government

Agencies mandate new inspections for S-92 gearbox

The latest main gearbox (MGB) problem for the Sikorsky S-92A: foot-mount cracking that could lead to the complete separation of the MGB and subsequent loss

By Mark Huber • Contributor

November 24, 2009

The latest main gearbox (MGB) problem for the Sikorsky S-92A: foot-mount cracking that could lead to the complete separation of the MGB and subsequent loss of helicopter control.

In October the EASA and FAA issued mirror Emergency Airworthiness Directives that mandate visually inspecting the MGB assembly mounting foot pads and foot ribs for cracks and corrosion every 10 flight hours. The ADs follow the issuance of Sikorsky Alert Service Bulletin (ASB) No. 92-63-020 dated Sept. 11, 2009, that called for the inspection. If a crack and corrosion is suspected, then a follow-on fluorescent or dye penetrant inspection must be conducted. If a crack is found, the entire MGB must be replaced before further flight. If corrosion, bubbled paint, or paint discoloration is found, then the MGB must be repaired before further flight. If no crack is found, then corrosion preventive compound must be applied to each foot pad and the rib area.

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