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A
737-300/400/500MAINTENANCE MANUAL
B. To compensate for wing flexing, duct misalignment, and thermal expansion, the ducts inboard of approximate slat station 175 are rigidly held and duct movement is absorbed by the swivel joints at each telescoping duct connection and by expansion bends in the duct routing. The ducts outboard of slat station 175 use slip-type expansion joints.
3. Wing Anti-Ice Control Valves____________________________
A. The flow of air into the wing TAI system is controlled by a wing TAI shutoff valve for each wing supply duct. The valves are located in the wing leading edge just inboard of each engine strut outboard seal rib (Fig. 1) and are 2-1/2-inch diameter electric motor-driven butterfly valves which operate on 115-volt ac power. Access to the valve is through an access door in the lower fixed leading edge. The valves are equipped with limit switches to prevent overrunning of the motor and valve positon indicator switches which are used in the valve position indicator circuits. Each valve is equipped with an external valve position indicator to verify valve position and have manual override.
4. Wing Anti-Ice Control Components________________________________
A. The operation of the wing anti-ice control valves are governed by the following electrical control components; main and nose landing gear safety relays, a WING ANTI-ICE control switch, valve control relays, two ground overheat thermal switches, two transistorized circuit cards and two throttle position switches (Fig. 2).
B. The safety relays are energized by the main gear safety sensor and nose gear safety sensor when the airplane is on the ground (Ref Chapter 32, Landing Gear Miscellaneous Electrical Components). The relays are used to provide a ground for operation of the system on the ground.
C. The WING ANTI-ICE control switch is located on the P5 overhead panel. The switch is a two position magnetic-trip switch. During ground operation of the wing anti-ice system, the WING ANTI-ICE switch remains in ON position but will automatically return to OFF position at airplane liftoff. Inflight operation requires manual positioning of the switch for system operation.
D. The valve control relay is located in the P5-11 module. The relay directs 115-volt ac power from the WING A/I circuit breakers to close the wing anti-ice control valves when de-energized and to open the valves when the relay is energized. The relay is controlled by transistorized circuitry in conjunction with the safety relays, the control switch, two throttle position switches and the ground overheat thermal switches.
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A 737-300/400/500MAINTENANCE MANUAL
P8 CONTROL STAND
Wing Thermal Anti-Iicing Simplified Circuit Figure 2
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737-300/400/500MAINTENANCE MANUAL
ANTI-ICING HOT AIR
DUCT EXHAUSTED
XFR BUS
115V AC
THROUGH EXHAUST C146
HOLES IN
WING ANTI-ICE
LOWER SLAT SKIN
M
28V DC
BAT BUS
C148
ENG 1 & WING
SLAT RETRACTED
ANTI-ICE CONT
AIR DISTRIBUTION P18 LOAD CONTROL CENTER V30 RIGHT WING (TYPICAL) ANTI-ICE VALVE
DUCT
S117 TAI FROM ENGINE M
CONNECTOR
M1236 LOW FLOW
SOLENOID
UTBOARD O
V29 LEFT WING
ENGINE 2
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