| Acronym | Meaning |
 | HFDS | Hydrogen Fluid Distribution System |
 | TU | Transport Unit |
 | PS | Power Supply |
 | ERRC | Expendability/Recoverability/Repair Capability |
 | ROC | Record Of Comments |
 | NDTF | Nondestructive Test Facility |
 | SHLB | Simulation Hardware Load Boxes |
 | ECP | Engineering Change Proposal |
 | SAAS | Shuttle Aerosurface Actuator Simulation |
 | CRIT | Critical |