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 4140-01-554-6966
NSN 6220-01-441-2249
NSN 5965-01-058-1414
NSN 5935-00-060-4298
NSN 5935-00-144-8017
NSN 7035-00-549-2722
NSN 6150-01-106-3345
NSN 6645-01-060-7988
NSN 6610-01-137-2767
NSN 5835-01-013-9321
NSN 5996-01-407-1458
NSN 2925-00-419-5868