Table 502/30-41-21-993-804 (Continued)
WINDOW TEMP
SENSOR
CONNECTOR/PINS RESISTANCE
*[1]
WHCU WDM
LEFT SIDE 2 D1046A/ 13 TO 26 304-342 OHMS M322 30-41-12
LEFT SIDE 2 (Spare) D16232/ 16 TO 17 304–342 OHMS M323 30–41–12
*[1] Window temperatures of 68°F (20°C) - 108°F (42°C) are expected for this test. If the temperature of any individual
window in Table 502 is greater than 108°F (42°C) due to environmental condition(s), then a measured sensor
resistance value less than 362 Ohms is acceptable. A measured sensor resistance value above 362 Ohms indicates
a failed sensor.
SUBTASK 30-41-21-760-003
(2) Do this to test the resistance of the spare sensors for the front windows:
(a) Put the applicable WNDSHLD SNSR switches in the spare position.
(b) Make sure that the resistance is within the limits shown on Window Heat Control Sensor
Resistance/Figure 503.
(c) Put the WNDSHLD SNSR switches back to the original position.
SUBTASK 30-41-21-760-004
(3) Do this test to measure the resistance of the spare sensors for the side windows.
NOTE: This test applies to spare sensors without quick disconnect plugs.
(a) Move the rubber terminal boot covers to expose electrical terminals and mounting
screws.
NOTE: The terminals are found at the bottom aft corner of the No. 2 Windows.
(b) Examine the terminals for corrosion and clean if necessary.
(c) Remove the D terminal lug that is attached to the primary sensor.
(d) Install the D terminal lug to the spare sensor.
(e) Make sure that the resistance is within the limits shown on Window Heat Control Sensor
Resistance/Figure 503.
(f) Remove the D terminal lug that is attached to the spare sensor.
(g) Install the D terminal lug to the primary sensor.
(h) Apply a layer of Dow Corning 340 heat sink compound, D50244, to the terminals with a
swab, G01659.
NOTE: The Dow Corning 340 heat sink compound, D50244, is intended to prevent
inadvertent loss of insulation between the sensor terminals and the metal frame
of the window, which can cause the window to overheat.
(i) Install the rubber terminal boot covers over the terminals as required.
NOTE: Ensure that the rubber terminal boot covers are securely installed to avoid
dislocation.
SUBTASK 30-41-21-760-007
(4) Do this test to measure the resistance of the spare sensors for the side windows.
NOTE: This test applies to spare sensors with quick disconnect plugs.
(a) Remove the quick disconnect plugs from the channel.
(b) Disconnect the quick disconnect plug for the primary sensor.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-41-21
Page 508
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
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