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1.  General
A.  The wing thermal anti-icing shutoff valves are located outboard of the engines in the leading edge of the wing. Access to the valves is through honeycomb panels in the bottom of the wing leading edge.
2.  Remove Wing Anti-Ice Shutoff Valve (Fig. 401)
A.  Open ENG & WING VALVE ANTI-ICE circuit breaker for respective engine on P18 circuit breaker panel.
B.  Remove access panel in bottom of wing leading edge.
C.  Disconnect electrical connector and bonding jumper from shutoff valve.
D.  Support shutoff valve and disconnect V-band coupling T-bolt on each side of shutoff valve.
E.  Slide V-band coupling away from shutoff valve and remove shutoff valve.
3.  Install Wing Anti-Ice Shutoff Valve (Fig. 401)
A.  Check that mounting flanges of shutoff valve and duct are clean, free of nicks, gouges, or cracks and in alignment with each other.
B.  Position shutoff valve between duct flanges with airflow directional arrow pointing outboard and motor pointing aft.
C.  Install V-band couplings.
D.  Connect bonding jumper and electrical connector to shutoff valve.
E.  Test Valve Control Circuit (Ref 30-11-0 A/T, airplanes without wing TAI system ground operation capability) or (30-11-01 A/T, airplanes with wing TAI system ground operation capability).
F.  Install access panel.
500 
Oct 20/84  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  30-11-11 Page 401 

F88049
Wing Thermal Anti-Icing Shutoff Valve  500 
30-11-11  Figure 401  Aug 15/67 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

WING ANTI-ICING GROUND OVERHEAT THERMAL SWITCH - REMOVAL AND INSTALLATION
1.  General
A.  The wing anti-icing ground overheat thermal switches are located approximately 6 inches outboard from the anti-icing shutoff valve. Access to the overheat thermal switches is through honeycomb panels in the bottom of the wing leading edge.
2.  Remove Wing Anti-Icing Ground Overheat Thermal Switch (Fig. 401)
A.  Open ENG 1 & WING ANTI-ICE CONTROL circuit breaker on P18 circuit breaker panel.
B.  Remove access panel in bottom of wing leading edge.
C.  Disconnect electrical connector.
D.  Unscrew switch from duct boss and remove switch and gasket.
3.  Install Wing Anti-Icing Ground Overheat Thermal Switch (Fig. 401)
A.  Prior to installation, connect electrical connector and perform Ground Overheat Protection Circuit Test (Ref 30-11-0 A/T, airplanes without wing TAI system ground operation capability) or (30-11-01 A/T, airplanes with wing TAI system ground operation capability). If thermal switch is satisfactory, disconnect electrical lead and install as follows.
B.  Install gasket on switch and screw switch into duct boss.
C.  Connect electrical connector.
D.  Install access panel.
500 
Oct 20/84  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  30-11-21 Page 401 

F88053
Wing Thermal Anti-Icing Ground Overheat Thermal Switch  500 
30-11-21  Figure 401  Aug 15/67 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

WING ANTI-ICE TELESCOPING DUCT - REMOVAL/INSTALLATION
1. General
A.  The wing anti-ice telescoping ducts connect the wing thermal anti-icing manifold to each of the six wing leading edge slat spray ducts. The telescoping duct consists of an inner telescoping duct which is attached to the wing manifold and an outer telescoping duct which is attached to the wing leading edge slat spray duct. When the leading edge slat is removed the two parts disengage and may be removed or installed independent of each other. The following procedure is for use with the slat installed and in extended position. To replace either duct with slat removed, use only that portion of the procedure that is applicable. The procedure is similar for each of the six locations with differences at slats 3 and 4 noted.
2.  Equipment and Materials
A.  Primer - BMS 10-11 type 1 (Ref 20-30-41, Finishing Materials)
3.  Remove Telescoping Duct at Slats 1, 2, 5 and 6 (Fig. 401)
A.  Lower wing leading edge slats (Ref Chapter 27, Wing Leading Edge Slats).
B.  Remove wing access panels as required to gain access to wing manifold on each side of telescoping duct to be removed (Ref Chapter 12, Wing Lower Surface Access Doors and Panels).
C.  Remove wing TAI supply duct connection and support clamps, as required to remove section of duct, from each side of inner telescoping duct and remove duct section.
　
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