Sikorsky Aircraft
Sikorsky aircraft has widely advertised its progress on developing of composite gear housing for aerospace application. On 24–26 June 1991, in Sacramento, CA, Sikorsky Aircraft has presented a photograph of its composite gear housing. Sikorsky used graphite-epoxy material for manufacturing of composite gear housing. The composite gear housing was manufactured with bearing interfaces identical to the original steel housing; sic "therefore the internal components will fit into the housing."