Boeing 747: Fuel Control and STAB/ALTN Trim Switches

747 Fuel Control & STAB/ALTN Trim Switches by jerome meriweather
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Fuel Controls

Switches - Control Fuel and ignition to the associated engine.
- RUN - Opens engine fuel and spar valves. Energizes igniters selected by the AUTO IGNITION selector or the STBY IGNITION selector.
- CUTOFF
  - Closes engine fuel and spar valves.
  - Discontinues any existing ignition.
  - Commands associated hydraulic demand pump to operate if demand pump selector is in AUTO.
Fire Lights - Lights in the switches come on with fire warning for the associated engine, and go off when the fire warning ceases.

Stab Trim Cutout Switches

ON - Allow pressure from the associated hydraulic system to power associated trim module.
AUTO - Normal guarded position. Allow pressure from the associated hydraulic system to power associated trim module. Automatically shut off hydraulic power if unscheduled trim is detected.
Cut Out - Shut off hydraulic power to the respective stabilizer trim module.

ALTN Stabilizer Trim Switches
Provide Stabilizer Trim in desired direction using alternate control channel.