| Overheat / Fire Protection Panel |
OVERHEAT/FIRE Test
The overheat and fire detection loops on both engines, the
APU, and the fire detector in the wheel well are tested by
pushing and holding the FAULT/INOP and OVHT/FIRE TEST
switch in the OVHT/FIRE position.
A total of 11 lights will be illuminated on the flight deck
during a successful OVHT / Fire test with AC power available
or 10 lights with battery power only available.
The overheat and fire detection loops on both engines, the
APU, and the fire detector in the wheel well are tested by
pushing and holding the FAULT/INOP and OVHT/FIRE TEST
switch in the OVHT/FIRE position.
A total of 11 lights will be illuminated on the flight deck
during a successful OVHT / Fire test with AC power available
or 10 lights with battery power only available.
Only if AC power
is available
during the test.
is available
during the test.
- The fire warning bell sounds.
- Both master FIRE WARN lights illuminate.
- Both MASTER CAUTION lights illuminate.
- The OVHT/DET system annunciator light illuminates.
- Both engine fire warning switches illuminate.
- The APU fire warning switch illuminates.
- Both ENG OVERHEAT lights illuminate.
- The WHEEL WELL fire warning light (illuminates only
if AC power is available.)
The flight deck indications for the OVHT/FIRE test are:
