Prelaunch

Augmented cooling system controls on the right console.

On a real mission, the following procedures are done at cruising altitude, before countdown:

Operation of Augmented Cooling System

To operate the augmented cooling system, proceed as follows:

1. Cabin helium source shutoff valve switch [11, fig. 5-9]  - OFF.

2. APU cooling switch [17, fig. 5-9] - SINGLE .

3. Pressure cooling lever [9, fig. 5-9] - OFF.

4. Windshield antifogging handle [2, fig. 4-3] - OFF.

5. X-15 LN2 supply switch (B-52) - Check OPEN. Check with launch operator that switch is at OPEN.

6. Vent suit heater switch [6, fig. 5-4] - HIGH or LOW, as required.

7. Pressure suit ventilation knob [5, fig. 5-4] - As required. Knob should be open a minimum of one turn.

8. Stable platform LN2 cooling control switch (B-52) - Check OFF. Check with launch operator that switch is OFF.

9. Ram-air lever [16, fig. 5-3] - CLOSED.

10. Blower switches [10, fig. 5-9] - BLOWERS & LN2 .

11. Mixing chamber temperature gage [42, fig. 5-1] - CHECK. When both chamber temperatures stabilize at -40° C (±5° C), proceed to step 12.

12. Stable platform switch [33, fig. 5-1] - EXT. Move stable platform switch to EXT and wait 10 minutes before proceeding to step 13.

13. Blower switches [10, fig. 5-9] - BLOWER ONLY.

14. Stable platform LN2 cooling control switch (B-52) - Check ON. Check with  launch operator that switch is ON.

In this section:

Before Countdown

Countdown

Useful Information Before Launch

See also:

Air Conditioning and Pressurization System