This is a sole-source procurement for a flight-critical part with an unstable design that is pending major changes, rendering the current configuration obsolete. The government intends to negotiate only with previously approved sources due to inadequate technical data for full competition. Unapproved sources must submit a comprehensive source approval request with their proposal, as the approval process is lengthy and cannot delay an award. The delivery terms are FOB Origin for a quantity of six units. Proposals received within 45 days of the synopsis publication will be considered, but this is a notice of intent, not a competitive request.