(3)  
Insert nozzle into pressure discharge port near pressure switch (Fig. 501). Hold firmly in place.

(4)  
Gradually introduce pressure into base of switch through nozzle.

CAUTION: DO NOT EXCEED 20 PSIG PRESSURE OR SWITCH MAY BE DAMAGED.

(5)  
Check that applicable FILTER ICING light, on forward overhead panel in flight deck, illuminates between 3 and 8 psig.

(6)  
Gradually decrease pressure and check that FILTER ICING light extinguishes between 6 and 2 psig.

(7)  
Relieve pressure and remove nozzle from filter housing.

(8)  
Deactivate power supply to flight deck ice warning instrumentation.

D.  Return Airplane to Normal
(1)  
Re-install fuel filter. Refer to Chapter 73-11-1, P & WA Maintenance Manual.

(2)  
Close cowl panel. Refer to Chapter 71, Engine Cowling.

500 
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H26655
Fuel Filter Differential Pressure Switch Test  500 
73-14-21Page 502   Figure 501 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 15/79 

FUEL (DEICING) HEATER - REMOVAL/INSTALLATION

1.  Equipment and Materials
A.  Petrolatum
2.  Remove Fuel (Deicing) Heater (Fig. 401)
A.  Open right removable cowl panel for applicable engine (Ref Chapter 71, Engine Cowling).
B.  Remove bolts (or bolts and nuts) attaching fuel deicing air inlet duct to heater.
C.  Remove bonding jumper installation nut and remove bonding jumper.
D.  Remove heater mounting nuts and washers from upper studs.
E.  Lift capillary temperature sensing tube support bracket from forward stud.
F.  Remove heater mounting nut and washer from lower stud.
G.  Lift capillary temperature sensing tube support bracket from lower stud and move tube aside.
H.  Lift heater clear of engine.
I.  Remove fuel transfer tubes. (These are located directly between heater and fuel control unit.)
J.  Remove nuts attaching fuel deicing air exhaust duct to heater and remove duct and bracket from heater.
3.  Install Fuel (Deicing) Heater (Fig. 401)
A.  Using new gaskets, position bracket and deicing air exhaust duct on studs in end of heater; install mounting nuts except the one supporting bonding jumper.
B.  Install two new seals, coated with petrolatum, on each fuel transfer tube.
500 
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H29206
Fuel Deicing Heater Installation  500 
73-14-31  Figure 401  Sep 20/81 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

C.  Install fuel transfer tubes in heater.
D.  Position heater on its mounting studs, carefully guiding fuel transfer tubes into fuel control unit.
E.  Secure heater with washer and nut on aft upper stud.
F.  Place capillary temperature sensing tube brackets on remaining studs, install washers and nuts.
G.  Replace bonding jumper and install nut.
H.  On engines incorporating P&WA SB 1005, install three bolts and nuts attaching fuel deicing air inlet duct to heater. On engines not incorporating P&WA SB 1005, install four bolts attaching fuel deicing air inlet duct to heater and lockwire.
I.  Operate engine (Ref Chapter 71, Power Plant). Check for air leaks around heater mounting flanges.
500 
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FUEL FLOW INDICATING SYSTEM - DESCRIPTION AND OPERATION
EFFECTIVITY
GJ ALL EXCEPT B-2509 and B-2510 HV ALL EXCEPT G-BGTW
1.  General
A.  The purpose of the fuel flow indicating system is to provide a visual indication of the fuel consumption of each engine. The fuel flow is measured in pounds per hour by fuel flow indicators which are located on the center instrument panel.
B.  The fuel flow indicating system consists of two fuel flow transmitters, two fuel flow indicators, and one fuel flow power supply. The fuel flow transmitters are located on the forward left side of the engines (Fig 1). The fuel flow power supply is located on the E3-3 electronic equipment rack.
C.  The fuel flow power supply provides constant frequency 3-phase power for driving the two fuel flow transmitters. Fuel flows through each fuel flow transmitter while en route to each engine. The fuel flow transmitters interpret the rate of flow into electrical signals. The electrical signals are transmitted to the fuel flow indicators which translates the electrical signals into mechanical movement of pointers on calibrated dials.
　
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