(2)
24-22-00/201, Electrical Power
C. Access
(1) Location Zones
107 Forward Half of Cabin
210 Air Conditioning Distribution Bay
D. Procedure
S 434-009
(1)
FOR THE 250°F (121°C) OVERHEAT SWITCH;
Connect the electrical connector to the switch.
S 434-010
(2)
FOR THE 190°F (88°C) OVERHEAT SWITCH; Make the wires which connect to the switch into a splice.
S 714-022
(3)
Do a test of the duct overheat switch:
(a)
Supply electrical power (Ref 24-22-00/201).
(b)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:
1) P6-4 panel
a) OVERHEAT
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A
737-300/400/500MAINTENANCE MANUAL
OVERHEAD DISTRIBUTION DUCT
SEE A
MAIN
DISTRIBUTION
MANIFOLD
SEE E
AIRPLANES WITH OVAL OVERHEAD DISTRIBUTION DUCTS
OVERHEAD DISTRIBUTION DUCT
SEE C
MAIN DISTRIBUTION MANIFOLD
SEEE
AIRPLANES WITH ROUND OVERHEAD DISTRIBUTION DUCTS
Duct Overheat Switches Installation
Figure 401 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
G94314
A 737-300/400/500MAINTENANCE MANUAL
190`F
OVERHEAT
SWITCH
SEE B
SCREW (3 LOCATIONS)
SCREW (3 LOCATIONS)
250`F 250`F OVERHEAT OVERHEAT SWITCH
FWD SWITCH
SEE B
FWD
OVERHEAD DISTRIBUTION DUCT
A
ELECTRICAL 190`F CONNECTOR OVERHEAT SWITCH
SPLICE
OVERHEAT SWITCHES
250`F OVERHEAT
B
SWITCH
SEE D
190`F OVERHEAT SWITCH
SEE D SCREW (3 LOCATIONS)
FWD
DISTRIBUTION
DUCT
SWITCH ELECTRICAL
OVERHEAD DISTRIBUTION DUCT
CONECTOR
C OVERHEAT SWITCH
D
Duct Overheat Switch Installation
Figure 401 (Sheet 2)
G94325
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A 737-300/400/500MAINTENANCE MANUAL
MAIN DISTRIBUTION MANIFOLD
SWITCH
FWD
DUCT OVERHEAT SWITCHES
Duct Overheat Switches Installation
Figure 401 (Sheet 3)
G94337
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A
737-300/400/500MAINTENANCE MANUAL
(c) FOR THE 190°F (88°C) OVERHEAT SWITCH;
Push the DUCT OVERHEAT light momentarily on the P5-10 air
conditioning module and make sure the light comes on.
(d) FOR THE 250°F (88°C) OVERHEAT SWITCH;
Push the PACK TRIP OFF light momentarily on the P5-10 air
conditioning module and make sure the light comes on.
(e) Disconnect the electrical connector, D486, from the left pack
valve.
(f) Do a test of the 190°F (88°C) duct overheat switch:
1) Push the applicable DUCT OVERHEAT light on the P5-10 air
conditioning control module.
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