The government is conducting market research to identify sources capable of repairing the Altimeter NSN 6610-01-459-7535 for USAF personnel. The acquisition strategy is a five-year contract (base plus four option years) continuing through FY31. The projected requirement is three units per year, totaling 15 units over the five-year period. The altimeter measures altitude via dial indication from a synchro source, with a zero-setting system and an automatic standby feature. It is designed for aircraft requiring precise altitude separation.