This is a pre-solicitation notice for a five-year, firm-fixed-price contract to overhaul hydraulic pumping units for the UH-60 Blackhawk helicopter, with an estimated quantity between 36 and 216 units. The place of performance is to be determined. The procurement will use a two-step sealed bidding process, where technically acceptable proposals must be submitted first, followed by pricing from qualified bidders. The requirement is currently unfunded, and any award will be withheld until sufficient funds are received. The technical proposal must comprehensively address the bidder's experience, facilities, quality plans, and overhaul capabilities for this specific item.