1. Arms Engineer CGSS 13. Arms SSE 2. Arms Engineer CMEC 14. Launch Accessories Eng 3. Oxidizer System Engineer COOS 15. Launch Accessories Eng 4. Oxidizer System Engineer 16. OMS/RCS SSE COOS 5. Fuel System Engineer COOS 17. Hydraulics Lead Engineer CHYD 6. Fuel System Engineer 18. APU Engineer 7. Hydraulics System Engineer CHYD 19. Orbiter HYD Engineer 8. Lead HYD System Engineer 20. OMS/RCS Lead 9. Lead APU System Engineer CAPU 21. Orbiter APU Engineer 10. APU System Engineer 22. SRB Lead Engineer 11. SRB HPU/HYD System Eng CBHY 23. SRB APU/HYD SSE CBHY 12. Lead SRB HPU/HYD Sys Eng 24. APU/HYD Engineer CHYD *SSE = System Specialist Engineer
C- 7/8 Console -- Swingarms, Hypergolics, Hydraulics, Auxiliary Power Units/Hydraulic Power Units (APUs/HPUs)
Key Positions: The Arms Engineers are responsible for the Orbiter Access Arm (CGSS) and the External Tank Gaseous Oxygen Vent Arm (CMEC) on the Fixed Service Structure at the launch pad. The flight crew enters the orbiter through the Orbiter Access Arm, which is retracted at about seven minutes prior to liftoff. At the end of the Orbiter Access Arm is the environmental chamber, known as the White Room, that interfaces with the crew module hatch. The Gaseous Oxygen Vent Arm has an attached vent hood, or "beanie cap," to heat the external tank's liquid oxygen vent system to prevent ice formation, and is retracted at 2 minutes, 30 seconds before liftoff.
The Lead Auxiliary Power Unit (APU) engineer (CAPU) and systems engineers control the APUs which run hydraulic pumps on the orbiter. The APUs are powered by hydrazine passing over a catalytic bed. These engineers also control the water spray boilers that cool the hydraulic fluid and the APU lube oil.
The Hydraulics Lead Engineer (CHYD) takes the hydraulic pressure generated by the APU/pump combination and directs it to the systems needing it. This includes the orbiter landing gear, main engine thrust vector controllers, rudder speed brake, elevons, and the body flap.
The Solid Rocket Booster HPU/HYD Systems Engineer (CBHY) and systems engineers control the Hydraulic Power Units (HPUs) on the two Shuttle boosters and route the resulting hydraulic pressure to the SRB engine gimbal actuators. The HPUs on the boosters are very similar to the APUs on the orbiter.
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