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.
8.10.4 D6-27370-866-EGP
Overheat/Fire Protection Panel Lights
1 Engine (ENG) OVERHEAT Light
Illuminated (amber) – indicates overheat in related engine.
Note: MASTER CAUTION and OVHT/DET system annunciator lights
illuminate.
2 FAULT Light
Illuminated (amber) – with the overheat detector switch in NORMAL - indicates
both detector loops for an engine have failed.
Illuminated (amber) – with the overheat detector switch in A or B – indicates the
selected loop for an engine has failed.
Note: MASTER CAUTION and OVHT/DET system annunciator lights do not
illuminate.
3 WHEEL WELL Fire Warning Light
Illuminated (red) – indicates fire in main gear wheel well
Note: Master FIRE WARN lights illuminate and fire warning bell sounds.
4 Engine BOTTLE DISCHARGE Light
Illuminated (amber) – indicates related fire extinguisher bottle has discharged.
5 APU Detector Inoperative (DET INOP) Light
Illuminated (amber) – indicates APU detector loop has failed.
Note: MASTER CAUTION and OVHT/DET system annunciator lights
illuminate.
DISCHARGE
APU BOTTLE
INOP
APU DET
FAULT
WELL
WHEEL
PULL WHEN ILLUMINATED
OVERHEAT
R
ENGINES
OVHT DET
NORMAL
B
A
12
T
S
E
T
T
X
E
E
R
I
F
T
H
V
O
P
O
N
I
DISCH
ENG 2
(FUEL SHUTOFF)
FIRE SWITCHES
OVERHEAT
ENG 1
OVHT DET
A
L
DISCH
LOCK OVERRIDE: PRESS
RL
DISCH
BUTTON UNDER HANDLE
L
R
DISCHARGEDISCHARGE
R BOTTLE
T
L
U
A
F
TEST
L BOTTLE
APU
BELL CUTOUT
NORMAL
B
1 2 3
5 6
AFT ELECTRONIC PANEL
4
7
September 15, 2016
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