Engine Failure

Failures of jet engines may be the result of improper fuel scheduling, caused by a malfunction of the fuel control system or incorrect operating techniques. An air start can usually be made to restore engine operation, provided time and altitude permit. If the fuel system shutoff valve fail light comes on in flight simultaneously with loss of power, it indicates the shutoff valve is partially closed. Do not cycle the fuel system shutoff switch. A landing should be made as soon as possible. If the light comes on in flight and a flame-out occurs, the throttle setting should be reduced and as a last resort cycle the fuel system shutoff switch in an attempt to open the valve and extinguish the light. Regardless of light indication, attempt an air start.

In case of obvious mechanical failure within the engine, air starts should not be attempted. When a frozen engine is suspected because of zero rpm indication but no obvious mechanical failure has occurred, normal utility hydraulic pressure and engine oil pressure will indicate the engine is rotating and the accessory drive is operating, and an air start should be attempted. If there is no indication of utility pressure or oil pressure, a successful air start is unlikely.

In case of obvious mechanical failure within the engine, air starts should not be attempted. When a frozen engine is suspected because of zero rpm indication but no obvious mechanical failure has occurred, normal utility hydraulic pressure and engine oil pressure will indicate the engine is rotating and the accessory drive is operating, and an air start should be attempted. If there is no indication of utility pressure or oil pressure, a successful air start is unlikely.

  1. Throttle — OFF.

    Note

    The ac generator is taken “‘off the line” automatically when the throttle is moved to OFF, Power can be restored to the 3-phase ac instrument bus by moving the standby instrument inverter switch to ON.

  2. Flight control emergency hydraulic pump lever (RAT) — ON. The emergency pump must be started to power flight control system No. 2 if the engine is frozen. If the engine is windmilling, the engine-driven pump output is sufficient for control during air start procedures, Because of the reduced total output, control movement must be kept to a minimum, whether the engine is windmilling or frozen, during operation on the emergency pump.

  3. Damper emergency disconnect lever — Press.

  4. Glide — 220 knots IAS.

  5. Nonessential electrical equipment — Off. Turn off all nonessential electrical equipment to reduce battery load.

    Caution

    At engine speeds below about 40% rpm, de generator output is not available, and the battery becomes the only source of electrical power. Usable battery power is available for about 6 to 22 minutes.

  6. Attempt air start. If air start is not successful — Eject.