Instrument Readings in Flight

The following conditions accompany normal rocket engine operation (APUs and engine operating, unlimited fuel option switch [27, fig. 5-3] at OFF):

System Monitor Panel

1. Ammonia tanks – Internal tanks, 1445 gallons; external tanks 1053 gallons (approx.), gradually decreasing.

2. Liquid oxygen tanks – Internal tanks, 1017 gallons; external tanks, 770 gallons (approx.), gradually decreasing.
   
   
3. Turbopump hydrogen peroxide (H2O2) tanks – 118 gallons, gradually decreasing.

4. Solid fuel (X-15AD-4 airplane only) – Both boosters, 100 percent, gradually decreasing.
   
   
5. Propellant source (helium) tanks – Both internal and external tanks, 3200-3800 psi, gradually decreasing.
   
   
6. Engine and propellant control source (helium) tanks – Both internal and external tanks, 3200-3800 psi, gradually decreasing.
   
   
7. Auxiliary pneumatic and control (helium) tank – 3200-3800 psi.
   
   
8. APU H2O2 tanks – 60-75 gallons, both pointers, gradually decreasing.

9. APU source (helium) tanks – 3200-3800 psi, both pointers, gradually decreasing.

10. Liquid N2 tank – 25-30 gallons, gradually decreasing.

11. Cabin helium tank – 3200-3800 psi, gradually decreasing.
    
    
12. Pilot's O2 (seat) cylinders – 2500-3000 psi, gradually decreasing.

Main Instrument Panel

1. Propellant source pressure gauge [69, fig. 5-1] – Both internal and external tanks, 3200-3800 psi and gradually decreasing (if the unlimited fuel option switch is at OFF).
   
   
2. H2O2 source pressure gauge [57, fig. 5-1] – Both internal and external tanks, 3200-3800 psi and gradually decreasing (if the unlimited fuel option switch is at OFF).
   
   
3. Propellant tank pressure gauge [71, fig. 5-1] – 45 to 53 psi (both pointers).

4. External tanks fuel flow indicator [4, fig. 5-1] – 50% to 100%.
   
   
5. Propellant pump inlet pressure gauge [72, fig. 5-1] – “L” pointer, 40 to 70 psi; “A” pointer, 40 to 55 psi.
   
   
6. APU source pressure gauge [45, fig. 5-1] – 3200-3800 psi, both pointers, gradually decreasing.
   
   
7. APU H2O2 tank pressure gauge [44, fig. 5-1] – 550 to 610 psi (both pointers), gradually decreasing.
   
   
8. Cabin helium source pressure gauge [40, fig. 5-1] – 1000 to 3400 psi.
   
   
9. Hydraulic pressure gauge [13, fig. 5-1] – 2900 to 3400 psi (both pointers).
   
   
10. Mixing chamber temperature gauge [42, fig. 5-1] – -45° C to -35° C (both pointers).
    
    
11. Generator (AC) voltmeter [22, fig. 5-1] – 195 to 205 volts, both pointers (internal power if generators are ON).
    
    
12. APU bearing temperature gauge [43, fig. 5-1] – 80° C to 130° C (both pointers), gradually increasing.
    
    
13. H2O2 tank and engine control pressure gauge [55, fig. 5-1] – “T” pointer, 0 psi; “C” pointer, 575-600 psi.
    
    
14. Propellant manifold pressure gauge [51, fig. 5-1] – “L” pointer, 440 to 1050 psi; “A” pointer, 495 to 1150 psi.
    
    
15. Chamber and stage 2 igniter pressure gauge [50, fig. 5-1] – long pointer, 345 to 600 psi; short pointer, 350 to 630 psi.