Utility Hydraulic System Failure

There is no emergency utility hydraulic system. If the utility hydraulic system fails, the speed brake, and nose wheel steering are inoperative. However, emergency accumulators provide pressure for nose gear lowering, wheel braking, and wing flap lowering. An accumulator also supplies pressure, if the utility system fails, to open the air inlet-outlet doors for operation of the ram-air turbine-driven flight control emergency hydraulic pump.

Note

The rudder is normally actuated by hydraulic power from the utility hydraulic system. If this system fails or pressure drops below 2900 psi, the summing valve in the rudder system admits enough flight control system No. 2 pressure to the rudder actuating cylinder to build the total pressure back to 3000 psi.

In case ofa utility hydraulic system failure, proceed as follows:

Note

Nose wheel steering and speed brake will be inoperative; however, wheel brakes may be available for directional control.

Note

If battle or structural damage is suspected, and arrestment gear permits, an approach end arrestment should be made.

  1. Speed brake switch — Check OFF (center).
  2. Landing gross weight — Reduce. Hf conditions permit, remain airborne in immediate vicinity of base to burn fuel down to normal landing weight.
  3. Land as soon as practical.
  4. Landing gear handle - DOWN.
  5. Landing gear emergency lowering handle — Pull.
  6. Wing flap handle - DOWN.
  7. Wing flap emergency switch - EMERGENCY DOWN. If wing flap actuation is not obvious, immediately place wing flap emergency switch to EMERGENCY DOWN.

  8. Throttle — OFF (if necessary). Move throttle to OFF in case of a drag chute failure.

    Caution

    No attempt should be made to taxi or park the airplane. Clear runway if possible, install nose gear safety pin and shut down.