APU System Failure

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The dual APUs provided allow normal operation as long as one APU is operating. However, certain equipment not required for safe flight will be lost.


Note: The SAS emergency hydraulic system automatically provides hydraulic power for the SAS pitch and roll servos in the event of a No. 2 hydraulic system failure.



LOSS OF

RESULTS IN COMPLETE LOSS OF

NECESSITATES USE OF

APU No. 1

Ball nose and SAS yaw

Mission abort may be required.

APU No. 1 & 2        

All hydraulic power

Emergency battery to attempt to restart APU.

APU No. 1 & 2        

All electrical power

If restart fails, ejection is mandatory.