This is a sole-source solicitation for a flight-critical part, requiring government source approval prior to contract award. Only previously approved sources have been directly solicited, though other responsible sources may submit proposals within 45 days of the synopsis publication to express interest. Unapproved sources must submit a comprehensive source approval package with their proposal, as the time required for new source approval typically precludes delaying an award. The Government intends to negotiate with only one source but will consider all proposals received to determine if a competitive procurement is possible. The delivery terms are FOB Origin.