ENGINE START Switches

GRD  –

  • Opens Start Valve
  • Closes Engine Bleed Valve

For ground starts, arms selected igniter(s) to provide ignition when Engine Start Lever is moved to IDLE

For inflight starts, arms both igniters to provide ignition when Engine Start Lever is moved to IDLE

Releases to AUTO at start valve cutout.

AUTO – Ignition normally off

Both igniters are activated when Engine Start Lever is in IDLE and:

  • An uncommanded rapid decrease in N2 occurs, or
  • N2 is between 57% and 50%, or
  • In flight – N2 is between idle and 5%.

Provides automatic ignition to selected igniters when:

  • Engine is running, and
  • Flaps are not up below 18000 feet altitude, or
  • Engine anti-ice is selected to ON.

CONT – Provides ignition to selected igniters when engine is operating and Engine Start Lever is in IDLE

In flight – Provides ignition to both igniters when N2 is below idle and Engine Start Lever is in IDLE.

FLT Provides ignition to both igniters when Engine Start Lever is in IDLE.

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