Viewing page 49 of 170

This transcription has been completed. Contact us with corrections.

don’t want to run off just 2&3 (note that these 2 do most of the work during this test). We need to know the APV fuel redline for entry, to determine a GO/NO GO criterion for this test (both test initiation & possible early termination)
NOTE: The hydraulic fluid was warmer than predicted on STS-1....this procedure may or may not be necessary on “cold-case” flights. 

FRCS Thermal Soakback - (DTO 212-01) also a thermal test, designed to determine effects of thermal soakback on valve seats, etc, & determine whether any constraints need be placed on RCS firings. Firings are 30 sec ON, 30 min-OFF. The 30 seconds is important, because the heat sink doesn’t reach its max until ~30 sec. 30 min-OFF is not so critical, 25 min will be written into CAP (to save 20 min). Note that each successive firing will “kick up” the temperature. 
[[drawing of upward steps]]
Goal is to look for the steady state.
F3F must be used because it has all the instrumentation (on valves & lines, as well as injectors) - (note that soakback characteristics are different for the different jets)
ENTIRE TEST (5 FIRINGS) required - ALL or NOTHING