737 Flight Crew Operations Manual
Fire Protection -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 8.10.7
1 Master Fire Warning (FIRE WARN) Lights
Illuminated (red) – indicates a fire warning (or system test) in engine, APU, main
gear wheel well or cargo compartment
• fire warning bell sounds
• if on ground, remote APU fire warning horn sounds.
Push –
• extinguishes both master FIRE WARN lights
• silences fire warning bell
• silences remote APU fire warning horn
• resets system for additional warnings.
Note: Pushing fire warning bell cutout switch on overheat/fire protection panel
results in same actions.
APU Ground Control Panel
1 APU BOTTLE DISCHARGE Switch
(spring–loaded to the right and safety wired.)
Left – discharges APU extinguisher.
Note: Armed only if APU fire control handle is pulled at this panel.
2 APU Fire Control Handle
Up – normal position.
BOTTLE DISCHARGE
1.PULL HANDLE DOWN
2.DISCHARGE BOTTLE
HORN
CUTOUT
DISCHARGE
BOTTLE
CONTROL
FIRE
A.P.U.
September 15, 2016