HEAT switch comes on in 12 seconds or less. 3) Make sure that PASS shows on the CDU.
(e)
Push the left WINDOW HEAT switch to the off position.
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A 747-400 MAINTENANCE MANUAL
(4) S 864-008Set the GND TEST switch on the P461, panel to NORM.
(5) S 864-010Remove electrical power (AMM 24-22-00/201).
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A
747-400 MAINTENANCE MANUAL
CONTROL AND OVERHEAT THERMOSTATS - REMOVAL/INSTALLATION
_______________________________________________________
1. General_______
A. This subject contains four tasks. The first two tasks are the removal and installation of the control thermostat for the No. 2 or No. 3 window. The second two tasks are the removal and installation of the overheat thermostat for the No. 2 or No. 3 window. In this procedure, you will open circuit breakers, disconnect the thermostat to be replaced, and install a replacement thermostat.
TASK 30-41-06-004-001
2. Control Thermostat Removal (Fig. 401)__________________________
A. References
(1)
AMM 56-11-02/401, No. 2 and 3 Windows
(2)
AIPC 30-41-06, Fig. 1
(3)
SSM 30-41-01, SSM 30-41-02
(4)
WDM 30-41-21, WDM 30-41-31
B. Access
(1) Location Zone 221 Control Cabin, RH - No. 2 and 3 Left Side Windows 222 Control Cabin, LH - No. 2 and 3 Right Side Windows
C. Procedure
S 864-002
(1)
Open 6E28, WINDOW HEAT PWR 2L&3R and 6E30, WINDOW HEAT PWR 2R&3L circuit breakers on the P6, Main Power Distribution Panel.
S 034-003
(2)
Lift the retainer and move the thermostat away from the windowpane: ~........................................ | Window 2L | Control Thermostat S760 | .......................................... | Window 3L | Control Thermostat S759 | .......................................... | Window 2R | Control Thermostat S761 | .......................................... | Window 3R | Control Thermostat S762 | 2.............…..........................1
(3)
Move the thermostat to one side and carefully lower the spring.
(4)
Disconnect the wiring at the thermostat.
S 024-004
S 034-005
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747-400
MAINTENANCE MANUAL
1L 1R
OVERHEAT
THERMOSTAT
SEE B
2L 2R
CONTROL THERMOSTAT
3L 3R
SEE A
WINDOW
FLIGHT COMPARTMENT WINDOWS
WINDOW 1. RETAINER BOLTSPRINGWINDOW
RETAINER
SPRING
3. RUBBER RING
THERMAL
SEALANT
CONTROL
THERMOSTAT
2. OVERHEAT THERMOSTAT
BRACKET
B
SEE C ELECTRICAL CONNECTOR 1
A
THERMOSTAT
O-RING
NOTE: LEFT SIDE WINDOWS THERMOSTATS INSTALLATION SHOWN, RIGHT SIDE WINDOWS THERMOSTATS INSTALLATION OPPOSITE.
C
1
SOME CONTROL THERMOSTATS DO NOT HAVE A SEPARATE
ELECTRICAL CONNECTOR
Control and Overheat Thermostats Installation
Figure 401
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