This is a procurement for a single, flight-critical part that requires existing Government source approval prior to contract award. The Government intends to solicit and negotiate with only the previously approved source(s) under limited competition authority. Unapproved sources may submit a proposal but must also include a complete source approval request, with the evaluation noting that new source approval typically takes too long to delay an award. Proposals from responsible sources will be considered if received within 45 days of the synopsis publication. The performance location and contract budget are not specified in the description.