Scrap bin would allude to using parts that are out of tolerance, time expired, or single use ie regardless of cycles or time on wing, the part is required to be

Scrap bin would allude to using parts that are out of tolerance, time expired, or single use ie regardless of cycles or time on wing, the part is required to be replaced every disassembly. This can include parts that have been assembled only to be disassembled because an issue was found before it left the shop.