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.
8.10.2 D6-27370-866-EGP
5 APU Fire Switch
Illuminated (red) –
• indicates fire in APU
• unlocks APU fire switch.
Note: Master FIRE WARN lights illuminate, fire warning bell sounds, and in the
main wheel well the APU fire warning horn sounds (on ground only), and
APU fire warning light flashes.
In – normal position, mechanically locked if no fire signal.
Up –
• arms APU extinguisher circuit
• closes fuel shutoff valve, APU bleed air valve, and APU inlet door
• trips generator control relay and breaker
• allows APU fire switch to rotate.
Rotate (left or right) –
• discharges APU fire bottle.
6 Engine Fire Switch
Illuminated (red) –
• indicates fire in related engine
• unlocks related engine fire switch.
Note: Master FIRE WARN lights illuminate and fire warning bell sounds.
In – normal position, mechanically locked if no fire signal.
Up –
• arms one discharge squib on each engine fire extinguisher
• closes fuel, hydraulic shutoff and engine bleed air valves
• disables thrust reverser
• trips generator control relay and breaker
• deactivates engine driven hydraulic pump LOW PRESSURE light
• allows engine fire switch to rotate.
Rotate (left or right) – discharges related fire bottle.
March 18, 2011
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