S117 CONTROL VALVE AND THERMAL
RIGHT WING
ENGINE 1 SWITCH INSTALLATION
GROUND THERMAL
WING (LEFT SIDE OPPOSITE)
ANTI-ICE SW
AIR TAI AIR PNEUMATIC MANIFOLD
GROUND
R344
HOT
WING TAINOSE AIR/GND SUPPLYS118SENSING RELAY MANIFOLD
LEFT WING
AIR DUCT
GROUND THERMAL ANTI-ICE SW AIRFLOW
GROUND
R279
GND SENSING
TAI FROM
RELAY
ENGINE THROTTLE E11 LANDING GEAR
ADVANCED LOGIC SHELF
S118 S823
L VALVE
R VALVE
OPEN
ENGINE 2
OPEN
b
b WING ANTI-TELESCOPING
WING ANTI-ICE
ICING SW (P8) FEEDER DUCT OFF
(TYPICAL)
ON
THROTTLE
ADVANCED
MASTER DIM & TEST S822
P5-11 ENGINE 1
ENGINE AND WING WING ANTI-
ANTI-ICE MODULE ICING SW (P8)
Wing Thermal Anti-Icing System Schematic Figure 3
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A
737-300/400/500MAINTENANCE MANUAL
E. The transistorized circuitry controls the indicating lights.
F. The ground overheat thermal switches are located at the root end of each wing leading edge distribution manifold. The switch is a temperature sensitive bimetallic-type switch with normally open contact points which close at approximately 125°C. Actuation of either switch, while the airplane is on the ground, will complete a circuit to close both wing anti-ice valves.
5. Wing Anti-Ice Indicating Components___________________________________
A. The wing anti-ice system is provided with a blue light for each control valve to indicate valve position. The lights are of the press-to-test type and are located on the overhead panel adjacent to the WING ANTI-ICE system control switch. The L VALVE OPEN and R VALVE OPEN indicating lights glow dimly whenever the respective valve is in the open position, and brightly whenever the respective valve position does not agree with the control switch position due to a system malfunction or during valve transit. The light may be tested through the use of the master light test switch. Refer to Chapter 33, Control Cabin Lighting, for the master test switch.
B. Each valve indicating light is controlled by transistorized circuitry. The system control switch must be in ON position. The transistorized control switches are on printed circuit cards mounted behind the overhead panel. The transistorized light control switches are supplied 28-volt dc power from the A/I control circuit breaker.
6. Operation_________
A. The wing anti-icing system is controlled manually by the WING ANTI-ICE control switch on the overhead panel. The wing anti-icing system may be operated continuously on the ground or inflight. Actuating the WING ANTI-ICE switch to the ON position opens the wing TAI control valves and allows pneumatic air to flow through the wing leading edge anti-ice ducts. During ground operation, when the WING ANTI-ICE switch is on, a solenoid valve in each engine strut will open and vent the precooler control valve sensor line to ambient and will allow the precooler control valve to move to the full open position. The wing leading edge is protected from overheat by two 125°C thermal switches which automatically close the wing TAI system shutoff valves. In addition, the wing TAI shutoff valves are automatically closed when the engine throttle lever angle is 32° or greater. The system will recycle the wing TAI system shut-off valves to the open position when the engine throttle lever angle is 32° or less and the air temperature is less than 125°C. During taxi and takeoff, the WING ANTI-ICE switch may be left in ON position but will automatically return to OFF position at airplane liftoff. Inflight operation requires manual switching of the system.
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A 737-300/400/500MAINTENANCE MANUAL
B. The L VALVE OPEN and R VALVE OPEN indicator lights provide an indication of the respective valve position. The light will glow bright if the valve position disagrees with the control switch position. The light will glow dim if the valve is open and the control switch position is in ON position. The light will not come on if the valve is closed and the control switch is in the OFF position.
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