This amendment increases the total quantity from 3 to 5 units for newly manufactured spare parts under a Foreign Military Sales (FMS) requirement. The government lacks the technical data to purchase from non-approved sources, so offers from unapproved suppliers will be deemed technically unacceptable. Any distributor of an approved source must submit an authorization letter from that source at the time of proposal submission. The solicitation is issued under Emergency Acquisition Flexibilities for a Critical Application Item.