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30-21-00
ALL ú ú 01 Page 3 ú Nov 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
PRIMARY
UPSTREAM REGULATOR
OPEN STOP POSITION ADJUSTMENT
ADJUSTMENT SWITCH COVER
CLOSED STOP
ADJUSTMENT
DOWNSTREAM RETAINING POSITION SCREW SWITCH COVER
HEX SHAFT
CLOSED
OPEN
PRESSURE REGULATOR VALVE MANUAL OVERRIDE
SECONDARY REGULATOR ADJUSTMENT
FWD RETAINING SCREW
ALLIED SIGNAL
CLOSED
TAI VALVE MID
HEX SHAFT POSITION
OPEN SHUTOFF VALVE MANUAL OVERRIDE
REFERENCE
UPSTREAM DOWNSTREAM
PRESSURE
ELEMENT REFERENCE ELEMENT
REGULATOR
PRESSURE ORIFICE
REGULATOR
SOLENOID
ACTUATOR OPENING CHAMBER ORIFICE
SENSE
CHAMBER
CLOSING CLOSINGPORT BACTUATOR SPRING
OPENING
CHAMBER
SHUTTLE
VALVE
AIR
SENSE
FLOW PORT A
CLOSING CHAMBER LOCK
LOCK OVERRIDE
CLOSED
COVER
OVERRIDE
OPEN
CLOSED
HEXCOVER PLATEOPEN
HEX
POSITION
PLATE
POSITION
SWITCH POSITION OPEN
CLOSED INDICATOR SHUTOFF VALVE
POSITION RETAINING MANUAL OVERRIDE
SWITCH SCREW AND POSITION LOCK
SWITCH
POSITION OPEN
INDICATOR PRESSURE REGULATOR
RETAINING MANUAL OVERRIDE
SCREW AND POSITION LOCK
Inlet Cowl TAI Valve
Figure 2 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
30-21-00
ALL ú ú 01 Page 4 ú Nov 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
G17431
A
737-300/400/500MAINTENANCE MANUAL
F. AIRPLANES WITH VIBRATION ISOLATORS FOR THE FORWARD MOUNT/THRUST REVERSER HINGE; To lock the pressure regulator valve in the open position, first the valve clamps must be loosened and the valve hardware must be removed. Then the valve must be rotated until the closed position adjustment setscrew can be removed and replaced with the locking screw. After the locking screw is installed, the valve must be realigned and the hardware and clamps reinstalled.
3. Thermal Anti-Ice (TAI) Pressure Switch______________________________________
A. The TAI pressure switch senses pressure from a pressure tap in the TAI ducting downstream of the valve. The function of the switch is to act as a check on the operation of the valve to prevent overpressurizaton of the inlet cowl. The switch is set to activate at 65 |3 PSI, and provides cowl overpressure warning indication by illuminating an amber COWL ANTI-ICE warning light in the cockpit.
4. Thermal Anti-Ice (TAI) Overheat Switch______________________________________
A. The TAI overheat switch senses temperature in the TAI ducting downstream of the valve. The switch is set to activate at 825 |20°F and will indicate an overtemperature condition by illuminating the master caution, anti-ice annunciator lights, and an amber COWL ANTI-ICE warning light in the cockpit. The unit consists of a thermostatic sensor that actuates a single-pole, single-throw switch.
5. Operation (Fig. 3)_________
A. Functional Description
(1)
When the ENG ANTI-ICE switch is positioned to ON for the selected engine, 28v dc is supplied to the TAI valve. The valve solenoid is energized and hot air is directed through the valve to the air distribution spray ring which contains holes that direct the anti-icing air to the inner lip of the inlet cowl. The air is circulated around the inlet cowl and vented overboard through the TAI exhaust port.
(2)
When the ENG ANTI-ICE switch is positioned to OFF, the valve solenoid is de-energized and the valve closes.
(3)
When the ENG ANTI-ICE switch is first positioned to ON, the blue COWL VALVE OPEN light comes on bright to indicate valve in transit. When the valve reaches the full open position, the light dims.
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