Next higher assembly is a/p22p20 pse
A molded foam rubber, one-piece, fabric-covered seating accommodation designed to upholster the back frame of an aircraft seat. It may include slide or snap-type fasteners for installation, seat cover removal, closure of inspection data pocket, and the like. Excludes cushion assembly, seat and back, aircraft; cushion, seat, aircraft; cushion, seat-survival kit, aircraft; and cushion, seat, aircraft survival.
Classification: Other parts of airplanes or helicopters for use in military aircraft (excludes propellers, rotors, undercarriages, and parts thereof)
NSN 6145-00-935-8783
NSN 5965-00-823-8623
NSN 4140-01-436-1658
NSN 5950-01-130-7664
NSN 7035-00-250-0982
NSN 2925-00-839-6815
NSN 6240-00-078-2360
NSN 5930-01-051-7726
NSN 5920-01-447-7953
NSN 5975-00-529-3835
NSN 5965-01-640-7104
NSN 5920-00-988-0869