However, at EPCOR -one of the world’s main suppliers of APU maintenance, repair and overhaul- a trend in post-storage failure of APU’s has been detected. Due to inadequate preservation measures during storage, APU’s suffer from full seizure and are rendered out of order. This has occurred with the Honeywell GTCP 131-9B, the APU operated on Boeing 737 aircraft, and may occur with other APU types as well.