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and red NO GO indicator lights are press-to-test. A GO
indication at a switch position shows that portion of the
system functions normally. A NO GO indication shows a
failure of that system. The instruction placard then shows
what component to replace.
The switch is spring-loaded to the FLIGHT position. You enable
the BITE test when you move the selector switch to any of the
other positions.
Position 1 does a test of the dc power supplies. This test makes
sure the basic fault detection circuit of the BITE function
operates.
Position 2 does a test of the open drive (heat) command for the
low limit valve. You can monitor the low limit valve as it moves
to the open position.
Position 3 does a test of the deadband temperature range. The
controller makes sure that the valve will not move when the
deadband is simulated.
Position 4 does a test of the close drive (cold) command for the
low limit valve. You can monitor the low limit valve as it moves
to the close position.
Position 5 does a test of the sensor. This test makes sure the
sensor does not have an open or short.
At the end of the BITE tests, you must return the switch to the
FLIGHT position.
AIR CONDITIONING - COOLING - LOW LIMIT (35F) CONTROLLER - BITE
EFFECTIVITY
GUN 101-118 21-50-00
Page 56
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-013
AIR CONDITIONING - COOLING - LOW LIMIT (35F) CONTROLLER - BITE
AIR CONDITIONING - COOLING - LOW LIMIT (35F) CONTROLLER - BITE
EFFECTIVITY
GUN 101-118 21-50-00
Page 57
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-013
Purpose
The conditioned air check valve permits one-way air flow from
the pack to the main distribution manifold.
The packs supply pressurized air through the check valve to the
distribution system. The check valve prevents air flow from the
pressurized distribution system to the unpressurized air
conditioning compartment. This is for single pack operation or
a pack system duct leak.
Location
The conditioned air check valve is in the distribution
compartment, forward of the aft bulkhead.
Physical Description
The conditioned air check valve is a split flapper type. An arrow
on the outside of the valve shows the flow direction.
There is one conditioned air check valve in each pack system.
Training Information Point
The check valve connects to a duct that goes through the
bulkhead between the air conditioning compartment and the
distribution compartment. The forward end attaches to the mix
chamber. The valve attaches to the duct and mix chamber with
V-band clamps.
AIR CONDITIONING - COOLING - CONDITIONED AIR CHECK VALVE
EFFECTIVITY
GUN 101-118 21-50-00
Page 58
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-021
AIR CONDITIONING - COOLING - CONDITIONED AIR CHECK VALVE
AIR CONDITIONING - COOLING - CONDITIONED AIR CHECK VALVE
EFFECTIVITY
GUN 101-118 21-50-00
Page 59
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-021
Purpose
The compressor discharge overheat switch and the turbine inlet
overheat switch monitor the pack for an overheat condition.
Location
There is a compressor discharge overheat switch and a turbine
inlet overheat switch in each of the air conditioning
compartments.
The compressor discharge overheat switch is in the duct
between the air cycle machine compressor section and the
secondary heat exchanger. The turbine inlet overheat switch is
in the duct from the secondary heat exchanger to the turbine
section of the air cycle machine.
Physical Description
The overheat switches have these parts:
* Electrical connector
* Switch housing
* Probe.
The overheat switches look similar. The compressor discharge
overheat switch closes at 390F/199C and the turbine inlet
overheat switch closes at 210F/99C.
The electrical connection is through a hermetically sealed
connector.
The housing has external threads and hexagonal wrench flats
for a boss mount.
Training Information Point
CAUTION: USE TWO WRENCHES WHEN YOU REMOVE/
INSTALL THE SWITCH IN/OUT OF THE BOSS.
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