737 Flight Crew Operations Manual
Supplementary Procedures -
Fire Protection
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
SP.8.2 D6-27370-866-EGP
Test switch ................................................................ OVHT/FIRE
If the FAULT light stays extinguished and both ENG
OVERHEAT lights, engine start lever lights, and engine fire
switches illuminate, loop A is good.
If the FAULT light illuminates and the ENG OVERHEAT light,
engine start lever 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, engine start lever lights, and engine fire
switches illuminate, loop B is good.
If the FAULT light illuminates and the ENG OVERHEAT light,
engine start lever light, and engine fire switch for an engine stay
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.
September 15, 2016
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