B737 Engine Start Panel

ENG SW
P5 FWD OVERHEAD

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 OFF at starter cutout.
  • OFF –
    • 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 65% and 50%, or
      • In flight – N2 is between idle and 5%.
  • 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.

Ignition Select Switch

  • IGN L – Selects the left igniter for use on both engines.
  • BOTH – Selects both igniters for use on both engines.
  • IGN R – Selects the right igniter for use on both engines.