S 715-169
(13)
Do the test again for the 190°F duct overheat switch for the passenger cabin, and re-connect the electrical connector D490 to the right pack valve.
F. Thermal Test - 250°F Duct Overheat Switches
NOTE: This test will make sure the 250°F duct overheat switch for the
____
control cabin and the passenger cabin operates correctly.
S 715-191
(1) Do a test of the 250°F duct overheat switch, S3:
(a)
Make sure that the L PACK switch is at OFF.
(b)
Remove the screws which hold the switch to the duct.
(c)
Remove the switch and its gasket from the duct.
(d)
Put a cover in the duct opening to keep out the unwanted materials.
CAUTION: DO NOT LET THE TEMPERATURE OF THE SWITCH PROBE GET HOTTER
_______ THAN 260°F (127°C). DAMAGE TO THE SWITCH COULD OCCUR.
(e)
Use the specified heat source equipment to increase the temperature of the switch probe.
(f)
Make sure these lights come on when the switch probe temperature reaches temperature 250|10°F (121|6°C): 1) Left PACK TRIP OFF light on the P5-10 panel 2) MASTER CAUTION and AIR COND annunciator lights
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737-300/400/500MAINTENANCE MANUAL
(g)
Remove the heat from the switch probe.
(h)
Let the switch probe become cool.
(i)
Push the TRIP RESET switch on the P5-10 panel.
(j)
Make sure that the MASTER CAUTION, AIR COND and the PACK TRIP OFF lights go off.
(k)
Remove the cover from the duct opening.
(l)
Attach the switch and its gasket to the duct with the screws.
S 715-192
(2) Do a test of the 250°F duct overheat switch, S6 or S990:
(a)
Make sure that the R PACK switch is at OFF.
(b)
Remove the screws which hold the switch to the duct.
(c)
Remove the switch and its gasket from the duct.
(d)
Put a cover in the duct opening to keep out the unwanted materials.
CAUTION: DO NOT LET THE TEMPERATURE OF THE SWITCH PROBE GET HOTTER
_______ THAN 260°F (127°C). DAMAGE TO THE SWITCH COULD OCCUR.
(e)
Use the specified heat source equipment to increase the temperature of the switch probe.
(f)
Make sure these lights come on when the switch probe temperature reaches temperature 250|10°F (121|6°C): 1) Right PACK TRIP OFF light on the P5-10 panel 2) MASTER CAUTION and AIR COND annunciator lights
(g)
Remove the heat from the switch probe.
(h)
Let the switch probe become cool.
(i)
Push the TRIP RESET switch on the P5-10 panel.
(j)
Make sure that the MASTER CAUTION, AIR COND and the PACK TRIP OFF lights go off.
(k)
Remove the cover from the duct opening.
(l)
Attach the switch and its gasket to the duct with the screws.
G. Put the Airplane Back to Its Usual Condition
S 415-170
(1)
Install the overhead ceiling panels which you removed in the passenger cabin (Ref 25-21-45/401).
S 415-171
(2)
Install the aft bulkhead lining which you removed in the forward cargo compartment (Ref 25-52-81/401).
S 865-172
(3)
Remove the electrical power if it is not necessary
(Ref 24-22-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
CONDITIONED AIR TEMPERATURE CONTROL SYSTEM - CLEANING/PAINTING
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