F. Remove bolts securing anti-ice valve rear flange to anti-icing air regulator.
G. Remove anti-icing valve.
NOTE: Assembly prior to P&WA SB 1536 will incorporate anti-icing air regulator or metering plug in forward end of rear anti-icing tube.
Assembly incorporating P&WA SB 5706 will incorporate gaskets between anti-icing valve and mating tube or support surface. Remove gaskets and note location to facilitate installation.
3. Remove Engine Anti-Icing Valve (Airplanes with Sealing Sleeve) (Incorporating PWA SB 5872) (Fig. 401)
A. Establish the clamp locations to facilitate installation.
B. Disconnect electrical connector from valve.
C. Remove the three bolts and washers from the front anti-icing tube elbow.
D. Remove the two bolts that attach the clamp to the front anti-icing tube.
E. Remove the two bolts and nuts that attach the half clamp to the sealing sleeve.
F. Remove the bolts, nuts, and washers that attach the anti-icing valve to the sealing sleeve.
G. Remove the bolts, nuts, and washers that attach the anti-icing valve to the rear anti-icing tube assembly.
H. Remove the anti-icing valve.
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Engine Anti-Icing Valve Installation 500
75-11-11 Figure 401 Oct 20/90
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4. Install Engine Anti-Icing Shutoff Valve (Fig. 401) (Engines before PWA SB\5872)
A. Position anti-icing valve on rear anti-icing tube and attach with 4 bolts. Tighten bolts and lockwire.
NOTE: If assembly is prior to P&WA SB 1536, install anti-icing air regulator or metering plug in forward end of rear anti-icing tube as applicable.
If assembly incorporates P&WA SB 5706, install gasket between anti-icing valve and rear tube.
B. Install anti-icing valve support to front flange of anti-icing valve with 4 bolts, washers and locknuts. Tighten locknuts.
NOTE: If assembly incorporates P&WA SB 5706, install gasket between anti-icing valve and support.
C. On airplanes with anti-icing valve support, attach anti-icing support to front compressor case bracket with nuts and bolts per one of the following methods:
(1)
Prior to P&WA SB 5666. Install bolts and locknuts through support and engine bracket, 1 washer under each bolthead and nut. Tighten nuts.
NOTE: Assembly prior to P&WA SB 3218 incorporate hex-head bolts with key washers under boltheads in lieu of flat washers. Install key washers under boltheads so that tab of key washer enters hole in engine bracket. Bend tabs of key washers against flat of bolthead after nuts are tightened.
(2)
Incorporating P&WA SB 5666. Position anti-icing valve support between lugs of engine bracket. Install bushing through lugs of bracket and support at each side from front. Install bolts with washers under boltheads through bushings from front, and washer and locknuts. Tighten nuts.
D. Install anti-icing air elbow attached to front anti-icing air tube to inlet case with new gasket, 3 washers and locknuts. Tighten locknuts.
E. Secure front tube with clip.
F. Connect electrical connector.
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5. Install Engine Anti-Icing Shutoff Valve (Airplanes with Sealing Sleeve) (Incorporating PWA SB 5872) (Fig. 401)
A. Attach the anti-icing valve to the rear anti-icing tube with four bolts, nuts, and washers. Tighten the bolts.
B. Attach the anti-icing valve to the sealing sleeve flange on the front anti-icing tube with the four bolts, washers, and locknuts. Tighten the locknuts.
C. Attach the half clamp on the sealing sleeve with bolts and locknuts to the bracket on the engine flange.
D. Attach the clamp, bolts, and nuts to the front anti-icing tube.
E. Attach the front anti-icing tube elbow with a new gasket with the washers and bolts to the inlet case. Tighten the bolts and lockwire.
F. Tighten the bolts (or locknuts) on the clamps and half clamp.
G. Connect the electrical connector.
H. Perform a functional test of the valve (Ref 75-10-0 A/T).
I. Close the engine cowl panels.
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NOSE COWL ANTI-ICING SHUTOFF VALVE AND THERMOSTATIC VALVE -REMOVAL/INSTALLATION
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