30-09-11
 ALL  ú ú 01 Page 403 ú Mar 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 WING THERMAL ANTI-ICING SYSTEM - DESCRIPTION AND OPERATION
__________________________________________________________
 1.  General_______
 A.  The Wing Thermal Anti-Icing (TAI) System is subject to ground and flight operation. The system may be operated continuously on the ground or inflight. During ground operation, with the wing TAI system on, the wing leading edge is protected from overheat by two 125°C thermal switches which automatically close the wing TAI system shutoff valves if the air temperature is greater than 125°C. The wing TAI shutoff valves are automatically closed when the left or right throttle lever angles exceed approximately 32 degrees. The system will automatically recycle the wing TAI system shutoff valves to the open position when the left and right throttle lever angles are less than approximately 32 degrees and the air temperature is less than 125°C. For ground operation, the precooler control valves controlled by external solenoid valves, will actuate wide open. Should the wing TAI switch be left in the on position during taxi and takeoff, the switch automatically returns to the OFF position at airplane liftoff. In flight operation requires manually switching of the system.
 B.  The wing thermal anti-icing (TAI) system removes ice buildup on the wing leading edge slats. The system receives regulated hot air from the pneumatic manifold. The flow of air is controlled by a shutoff valve for each wing. Both valves are operated by a single control switch on the pilot's overhead panel. When the system is in operation, the valves direct air through a distribution system to the wing leading edge slats. The system consists of supply and distribution ducting, two control valves, electrical control components, thermal switches and indicating components (Fig. 1, 2, and 3).
 2.  Wing Anti-Ice Ducting_____________________
 A.  The pneumatic air duct is connected to each of the wing leading edge supply ducts through a control valve located in the wing leading edge just inboard of the wing strut closure rib on each side of the airplane (Fig. 1). The wing supply ducts are connected to each of the wing leading edge slats by telescoping ducts. The telescoping ducts consists of two tubes, one of which slides within the other as the slats are extended or retracted, and are sealed by an O-ring between them. The inner telescoping duct is connected to the wing TAI supply manifold ducts by a swivel T-connection to allow rotational movement of the telescoping duct around the wing supply duct. The T-connection is sealed by an O-ring between each end of the T and the supply duct. The outer telescoping duct is connected to a slat anti-icing spray duct by a swivel T-connection to allow rotational movement of the telescoping duct about the slat anti-icing spray duct. A support bracket in the slat leading edge supports the ends of the slat spray ducts and the telescoping duct and prevents the TAI air from flowing back through the telescoping duct cutout in the slat beam. The slat anti-icing spray duct runs the full length of the slat and has perforations to direct the air towards the slat leading edge. The air then flows between the slat upper skin and the slat beam where the air is exhausted overboard through openings in the slat lower skin.
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 30-11-00
 ALL  ú ú 02 Page 1 ú Jul 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
WING ANTI-ICE CONTROL VALVE
GROUND OVERHEAT THERMAL SWITCH
SEE A  WING TAI AIR
SUPPLY MANIFOLD

A
SEEB A
PNEUMATIC
DUCT

L VALVE
R VALVE OPEN B
OPEN B
WING ANTI-ICE OFF
O-RING
DUCT BEARING
ON
TAI SUPPLY FORWARD OVERHEAD PANEL MANIFOLD
A
INNER DUCT WINGTELESCOPING DUCT
BEARINGS FRONT SPAR CAP NUT
SEAL WITH
BACKUP RINGS
OUTER
INNER
TELESCOPING TELESCOPING DUCT TELESCOPING
DUCT
AND SPRAY DUCT DUCT
SUPPORT BRACKET
IN SLAT LEADING EDGE

OUTER WING TAI SUPPLYTELESCOPING MANIFOLD DUCTDUCT
TELESCOPING DUCT DOOR
SLAT REMOVABLE SLAT INNER SKIN PANEL
BEARING SPRAY
DOUBLER AND COVER PLATE DUCT
A-A
SLAT INNER SKINOVERBOARD EXHAUST
THRU LOWER SKIN TAI AIRFLOW BETWEEN BEAM
AND SLAT UPPER SKIN
　
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