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 B.  The system consists of ducting, a dual purpose pressure regulating and shutoff valve, a pressure switch and an overheat switch downstream of the valve, an anti-icing distribution spray ring located in the lip of the inlet cowl, and an exhaust port located at the 6 o'clock position on the inlet cowl.
 C.  Each engine anti-ice system operates independently. Each valve is pneumatically operated and electrically controlled by a switch located on the pilots' overhead panel. The associated valve position indicator lights and warning lights are located adjacent to the switches.
 2.  Thermal Anti-Ice (TAI) Valve (Fig. 2 and 3)____________________________
 A.  The TAI valve, located at the 1:30 o'clock position (aft looking forward) on the fan frame, is line mounted in the TAI ducting and is secured with V-band couplings. The valve is air operated and is set to regulate outlet pressure at 50 |3 psi. The valve is fully open at inlet pressures of 10 to 47 psi. The unit consists of a normally closed butterfly shutoff valve, a normally open pressure regulator butterfly valve, a servo pilot valve and associated components which form an insulated air duct section. If the pressure regulator valve fails to regulate the pressure, the shutoff valve will maintain the pressure at 75 |10 psi.
 B.  A manual override provision is incorporated in the valve for direct mechanical operation and for locking the valve in a partially open position in the event of system malfunction. The valve is designed to fail in the closed position. The valve incorporates two position switches to provide valve position indication in the cockpit.
 C.  The pressure regulator valve is spring loaded in the valve open direction. Inlet pressure P1 is admitted through restrictor orifices 1 and 2 to the actuator piston chambers. When the pressures in both chambers are equal, the actuating mechanism tends to open the valve.
 D.  The shutoff valve is spring loaded in the valve closed direction. Downstream pressure P2 is directed through the ground test supply shuttle valve into both actuator piston chambers. Downstream pressure P2 is also admitted through a restrictor orifice into the overpressure pilot valve. The actuating mechanism maintains the valve in the closed position when the solenoid pilot valve is de-energized.
 E.  The pressure regulator valve and shutoff valve both have provisions for manual override by means of external wrenching flats on the valve position indicators. The pressure regulator may be locked in the open position by replacing the closed position adjustment setscrew with a locking screw. The shutoff valve may be locked in either the closed or midposition by inserting a quick-release pin into the lock hole provided in the valve cover.
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 30-21-00
 ALL  ú ú 01 Page 1 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

SEE A
TAI VALVE  TAI PRESSURE SWITCH
TAI DUCT 
TO 5TH 
STAGE 
DUCT 
TAI 
FWD  OVERHEAT 
SWITCH 
A 
Inlet Cowl Anti-Icing System Component Location 
Figure 1 

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 ALL  ú ú 01 Page 2 ú Nov 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

LOCKING SCREW 
(STOWED) 
CLOSED  SEE  A 
POSITION STOP  CLOSED POSITION  ELECTRICAL  PRESSURE 
ADJUSTMENT  CONNECTOR  REGULATOR 
SETSCREW  SHUTOFF  VALVE 
VALVE 
SERVO 
PILOT 
LOCKING PIN  VALVE 
(STOWED) 

A
INLET PORT
GROUND TEST
SUPPLY PORT
OUTLET PORT
INSULATION
FWD
WHITTAKER TAI VALVE
GROUND TEST P3 PORT
SHUTOFF VALVE  PRESSURE REGULATOR VALVE
GROUND TEST P3 PORT OVERPRESSURE SERVO PILOT
SERVO PILOT VALVE
SOLENOID
VALVE PILOT VALVE CHAMBER A
GROUND TEST SUPPLY PORT ORIFICE 1ACTUATOR PISTON ACTUATOR PISTON
ORIFICE 2
OUTLET P2P3 P1 INLET PORTPORT DOWNSTREAM PRESSURE
　
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