S 864-016
(2)
Open this circuit breaker on the P6-4 panel and attach a DO-NOT-CLOSE tag:
(a) AIR COND OVERHEAT
(3)
Find the applicable switch.
(4)
Disconnect the electrical connector.
S 034-003
S 034-004
S 024-014
CAUTION:_______USE TWO WRENCHES WHEN YOU REMOVE THE SWITCH FROM THE BOSS. IF YOU DO NOT USE TWO WRENCHES, YOU CAN CAUSE DAMAGE TO THE DUCT.
(5)
Remove the switch and the O-ring from the duct.
S 434-006
(6)
Put covers on all the duct openings to prevent the entry of contamination.
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A 737-300/400/500MAINTENANCE MANUAL
TURBINE INLET OVERHEAT SWITCH
SEE B
AIR CYCLE MACHINE SEE A
AIR CYCLE MACHINE
FWD SEE A COMPRESSOR DISCHARGE OVERHEAT SWITCH
COMPRESSOR
SIGHT GAGE
DRAIN PLUG
TURBINE
FWD
AIR CYCLE MACHINE
A
DUCT
BOSS
ELECTRICAL CONNECTOR
0-RING
TURBINE INLET
OVERHEAT SWITCH
TURBINE INLET OVERHEAT SWITCH B
A52100
Pack Overheat Switches Installation
Figure 401
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A
737-300/400/500MAINTENANCE MANUAL
TASK 21-51-18-404-007
3. Install the Pack Overheat Switches (Fig. 401)__________________________________
A. References
(1) 20-30-21/201, Lubricants
B. Access
(1) Location Zones
212 Left Air Conditioning Equipment Bay
214 Right Air Conditioning Equipment Bay
C. Install the Switches
S 434-009
(1) Put the antiseize compound on the threads of the switch.
S 424-015
CAUTION:_______USE TWO WRENCHES WHEN YOU INSTALL THE SWITCH IN THE BOSS. IF YOU DO NOT USE TWO WRENCHES, YOU CAN CAUSE DAMAGE TO THE DUCT. MAKE SURE YOU DO NOT PUT THE ANTISEIZE COMPOUND ON THE MATING SURFACES OF THE SWITCH AND THE BOSS.
(2) Install the switch into the duct boss with a new O-ring.
(a) Tighten the switch.
S 434-011
(3) Connect the electrical connector.
D. Put the Airplane Back to Its Usual Condition
S 864-021
(1)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:
(a) AIR COND OVERHEAT
(2)
Close the equipment bay doors for the air conditioning.
S 414-013
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A
737-300/400/500MAINTENANCE MANUAL
HEAT EXCHANGERS - REMOVAL/INSTALLATION
______________________________________
1. General
_______
A. This procedure has two tasks. The first task removes the primary or secondary heat exchanger. The second task installs the primary or secondary heat exchanger.
B. Each pack has a primary and secondary heat exchanger. The heat exchangers are installed between two sections of the ram air duct in the equipment bay for the air conditioning (Fig. 401). The procedures for the removal and installation of the heat exchangers are almost the same. The procedure that follows is for the primary or the secondary heat exchanger. Differences in the procedure for the primary or secondary heat exchanger are given in the applicable step.
TASK 21-51-21-004-001
2. Heat Exchanger Removal
______________________ ú A. References
(1) AMM 21-51-51/401, 35 F Control Valve
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