This amendment adds a new line item for a printed circuit board (NSN 7RH 5998 017227520 P8, P/N 6529-321, quantity 2) to the solicitation. Only FAA-certified parts with an FAA Form 8130-3 Airworthy Approval Tag are acceptable, and only from government-approved sources; distributors must provide an authorized distributor letter. The item is a Critical Application Item, and only newly manufactured spares are acceptable—no refurbished, remanufactured, or repaired material. Drawings are not available, and offers from non-approved sources will be deemed technically unacceptable. A 12-month warranty applies, with defects reported within 45 days of discovery.