737 Flight Crew Operations Manual
Supplementary Procedures Chapter SP
Fire Protection Section 8
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP SP.8.1
8 Fire Pro tectionFire Pro tectionFile Highlig ht
Fire and Overheat System Test with an Inoperative Loop
YK981 - YQ456
To determine the specific inoperative loop:
OVHT DET switches.................................................................. A
Test switch ................................................................ OVHT/FIRE
If the FAULT light stays extinguished and both ENG
OVERHEAT lights and engine fire switches illuminate, loop A
is good.
If the FAULT light illuminates and the ENG OVERHEAT light
and engine fire switch for an engine stay extinguished, there is a
fault in loop A of the detection system for that engine.
OVHT DET switches...................................................................B
Test switch ................................................................ OVHT/FIRE
If the FAULT light stays extinguished and both ENG
OVERHEAT lights and engine fire switches illuminate, loop B
is good.
If the FAULT light illuminates and the ENG OVERHEAT light
and engine fire switch for an engine extinguished, there is a fault
in loop B of the detection system for that engine.
OVHT DET switches...................................................As required
Select the good loop for each engine (NORMAL if both loops
tested good).
Test switch ................................................................ OVHT/FIRE
If the test is successful leave the fire panel in this configuration
for flight.
Fire and Overheat System Test with an Inoperative Loop
YW273, YW274
To determine the specific inoperative loop:
OVHT DET switches.................................................................. A
September 15, 2016
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