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.
8.10.8 D6-27370-866-EGP
Down –
• arms APU BOTTLE DISCHARGE switch (on this panel only)
• closes APU fuel shutoff, bleed air valve and APU inlet door
• trips generator control relay and breaker.
3 APU Fire Warning HORN CUTOUT Switch
Push –
• silences fire alarm bell
• silences APU fire warning horn
• causes APU fire warning light to stop flashing but remain illuminated.
4 APU Fire Warning Light
Illuminated (red flashing) – indicates fire in APU.
Note: Also, flight deck fire warning bell sounds and APU fire warning horn in
main wheel well sounds.
Illuminated (red steady) – indicates APU fire warning HORN CUTOUT switch
has been pushed following an APU fire indication.
Lavatory Fire
Lavatory Fire Extinguisher
250°F
230° F
200°F180°F
BLACK WHEN EXPOSED
September 15, 2016
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