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B.  Open left and right removable cowl panels for applicable engine (Ref Chapter 71, Engine Cowling).
2.  Remove Fuel Heat (Deicing Air) Valve
A.  Disconnect electrical connector from valve (Fig. 401).
B.  Remove valve mounting bolts.
C.  Loosen bolts attaching deicing inlet duct to fuel deicing heater.
D.  Remove bolts attaching deicing inlet duct clamps to engine, located at 3 and 5 o'clock positions.
E.  Remove flange supporting bolt.
F.  Support valve and move heater deicing inlet duct downward until valve can be removed.
G.  On engines incorporating P&WA SB 5706, remove metal gaskets between valve and upper tube flange and lower tube flange.
NOTE:  Make note of gasket locations when removing and keep gaskets separate. Retain gaskets for later reinstallation.
H.  Lift valve clear of engine.
3.  Install Fuel Heat (Deicing Air) Valve
A.  Move heater deicing inlet duct downward until valve can be inserted between flanges of ducts.
B.  On engines incorporating P&WA SB 5706, install metal gaskets between valve and upper tube flange and lower tube flange.
C.  Insert valve between duct flanges then move heater deicing inlet duct upward until it contacts valve.
D.  Install flange supporting bolt.
E.  Install valve mounting bolts.
500 
Feb 20/88  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  73-14-11 Page 401 

F. Install bolts attaching deicing inlet duct clamps to engine, tighten finger-tight only.
G. Tighten bolts attaching deicing inlet duct to heater and lockwire.
H. Tighten bolts attaching clamps to engine.
I. Connect electrical connector to valve.
J. Perform operation check of valve (Ref Engine Fuel Heating (Deicing) System - A/T).
K. Close engine cowl panels.

H30572
Fuel Deicing Air Valve Installation  500 
73-14-11  Figure 401  Feb 20/88 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

FUEL FILTER DIFFERENTIAL PRESSURE SWITCH - REMOVAL/INSTALLATION
1.  Equipment and Materials
A.  Naphtha oil
B.  Lint-free cloth
2.  Prepare to Remove Fuel Filter Differential Pressure Switch
A.  Pull applicable INDICATOR LTS circuit breaker, for applicable engine, on circuit breaker panel P6.
B.  Open right removable cowl panel for applicable engine (Ref\Chapter\71,\Engine Cowling).
3.  Remove Fuel Filter Differential Pressure Switch
A.  Disconnect electrical plug from switch.
B.  Remove switch mounting bolts, and liftoff switch.
4.  Install Fuel Filter Differential Pressure Switch
WARNING:  DO NOT GET NAPHTHA IN YOUR MOUTH OR EYES, OR ON YOUR SKIN. DO NOT BREATHE THE FUMES FROM NAPHTHA. PUT ON A PROTECTIVE SPLASH GOGGLE AND GLOVES WHEN YOU USE NAPHTHA. KEEP NATHPHA AWAY FROM SPARKS, FLAME, AND HEAT. NAPHTHA IS A POISONOUS AND FLAMMABLE SOLVENT WHICH CAN CAUSE INJURY OR DAMAGE.
A.  Thoroughly clean mating surfaces of switch and fuel filter with naphtha oil, wipe dry with lint-free cloth.
B.  Install new seal in ports on switch.
C.  Place switch on fuel filter and install four mounting bolts.
D.  Connect electrical connector to switch.
E.  Test engine in accordance with Power Plant Repair Reference Table, Test A (Ref 71-00 A/T).
F.  Close engine cowl panels.
500 
Oct 20/89  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  73-14-21 Page 401 

H26652
Fuel Filter Differential Pressure Switch Installation  500 
73-14-21Page 402   Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 15/73 

FUEL FILTER DIFFERENTIAL PRESSURE SWITCH - ADJUSTMENT/TEST
1.  Fuel Filter Differential Pressure Switch Test
A.  Equipment and Materials
(1)  
Clean dry air or nitrogen source, 0-20 psig

(2)  
Nozzle - Pratt & Whitney Part No. 33682

(3) 
 Petrolatum

B.  Prepare for Switch Test
(1)  
Open right removable cowl panel for applicable engine . Refer to Chapter 71, Engine Cowling.

(2)  
Remove fuel filter. Refer to Chapter 73-11-1, P & WA Maintenance Manual.

C.  Test Fuel Filter Differential Pressure Switch
(1)  
Activate power supply to flight deck ice warning instrumentation by closing applicable FUEL CONTROL circuit breaker on main load control circuit breaker panel P6-3.

(2)  
　
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