Air Start

Immediate Restart

Warning

If a flame-out occurs when the aircraft is in landing configuration at less than 2,000 feet above the terrain, EJECT if CAUTION the landing is not assured. DO NOT under oot any circumstances attempt an airstart below 2,000 feet.

  1. Throttle - Check Inboard.
  2. Air Start Switch - On.
  3. Fuel Regulator Selector Switch - Emergency. Adjust throttle setting to match actual engine rpm as closely as possible.

Air Start Procedures

  1. Throttle — OFF.

  2. Air start switch — ON. Move air start switch to ON. (Ignition is not available until the throttle is moved outboard and forward from OFF.)

    Note

    If during an air start the ignition-on and dc generator caution lights do not come on, the air start switch may be defective. Start attempt should then be made using the starter and ignition button to provide engine ignition. However, if this button is used, the de generator switch should be turned OFF during ignition to prevent possible premature discharge of the battery.

    Note

    All nonessential electrical equipment should be turned off to conserve battery power after the flame-out occurs. DC generator power (which controls the secondary and tertiary bus output) is not available at engine speeds below 40% rpm. When the air start switch is ON, the dc generator is cut out of the electrical system. This prevents the battery from powering the generator at low engine rpm if the reverse-current relay operation is faulty. DC generator output is restored when the air start switch is returned to OFF.

    Note

    AN/ARC-34 communication equipment is powered by the primary bus and is operative when the de generator or battery is on.

    *** FIGURE 3-4 pg 3-11 air start envelope*

  3. Throttle - IDLE. As soon as possible after these conditions are met, move throttle to IDLE, if start attempt is made on the normal fuel control system. Fuel flow should be about 640 to 850 pounds per hour. Slowly advance throttle to point where positive thrust is indicated by a pronounced increase in fuel flow and a corresponding increase in exhaust temperature. Then adjust throttle to desired rpm. If start attempt is to be made on emergency fuel control system, move fuel regulator selector switch to EMER and advance throttle to IDLE. When engine rpm reaches 60%, advance throttle slowly. This procedure is recommended at altitudes above 30,000 feet to prevent compressor stalls and engine overtemperature.

  4. Air start switch — OFF. Return air start switch to OFF to de-energize ignition system and restore normal generator operation as soon as air start is completed (engine at idle).

  5. Flight control emergency hydraulic pump lever (RAT) — OFF.

If Engine Fails To Start

  1. Ignition circuit breaker — Check in.
  2. Start attempt — Repeat. (Use emergency system if first attempt was made on the normal fuel system.) Retard throttle to OFF if there is no indication of light-up within 20 seconds after throttle has been moved to IDLE.
  3. If air start unsuccessful - Eject.