Orbiter Auxiliary Power Unit Flight Support PlanThis paper discussed the development of an integrated Orbiter Auxiliary Power Unit (APU) and Improved APU (IAPU) Flight Suuport Plan. The plan identifies hardware requirements for continued support of flight activities for the Space Shuttle Orbiter fleet. Each Orbiter vehicle has three APUs that provide power to the hydraulic system for flight control surface actuation, engine gimbaling, landing gear deployment, braking, and steering. The APUs contain hardware that has been found over the course of development and flight history to have operating time and on-vehicle exposure time limits. These APUs will be replaced by IAPUs with enhanced operating lives on a vehicle-by-vehicle basis during scheduled Orbiter modification periods. This Flight Support Plan is used by program management, engineering, logistics, contracts, and procurement groups to establish optimum use of available hardware and replacement quantities and delivery requirements for APUs until vehicle modifications and incorporation of IAPUs. Changes to the flight manifest and program delays are evaluated relative to their impact on hardware availability.
Document ID
19910026298
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Guirl, Robert (Sundstrand Corp. Rockford, IL, United States)
Munroe, James (Rockwell International Corp. Downey, CA, United States)
Scott, Walter (NASA Johnson Space Center Houston, TX, United States)