Boeing 737 NG Systems Review
Forward Overhead Panel  800/900
Display Selector
Bleed Air Panel 800/900
Recirculation (RECIRC) FAN Switches

OFF -

Fan signalled off.

AUTO –

In-flight –

  • The left recirculation fan operates if both packs are
    operating unless either PACK switch is in HIGH.

  • The right recirculation fan operates if both packs are
    operating unless both PACK switches are in HIGH.

On the ground –

  • The left recirculation fan operates unless both PACK
    switches are in HIGH.

  • The right recirculation fan operates even if both PACK
    switches are in HIGH.