Specifications include, but are not limited to: Aircraft Engine Parts, Maintenance, and Rentals - Rolls Royce/Allison. * Pricing for exchange parts is understood to be based on exchange cores being of the revision level. In the event return core is a different revision, vendor may elect to adjust price up or down accordingly based on the vendors published price for the upgrade(s). IE: Vendor ships a -21 Fuel Control, end user returns a -17 core unit. Vendor adds the cost to upgrade the -17 to a -21 to the exchange cost. Vendor ships a -21 fuel control, end user returns a -25 core. Vendor deducts the cost of upgrading the -21 to a -25 from the exchange cost. * Rental cost shall revert to 0 in the event vendor exceeds 45 calendar days (after written approval to proceed) to repair or overhaul the specific unit. * Vendor is required to ship parts (new, overhauled condition or exchange units) immediately in an AOG situation. Vendor is required to notify conformation of shipment including shipper’s tracking number to the ordering agency within two (2) hours of receipt of an order.