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ENGINE FUEL HEATING (DE-ICING) SYSTEM - ADJUSTMENT/TEST
1. Engine Fuel Deicing System Test
A. Fuel Heat Valve Test
(1)
Prepare for test.
(a)
Connect electrical power sources.
(b)
Open left and right removable cowl panels for each engine. Refer to Chapter 71.
(c)
Check that fuel heat switches, on forward overhead panel, are in OFF position.
(d)
Close FUEL HEAT, FUEL CONTROL, and BOOST PUMP CONTROL circuit breakers on circuit breaker panel P6-3.
(e)
Press-to-test fuel heat valve open light and fuel filter icing light to assure light will illuminate.
(2)
Test fuel heat valve.
(a)
Place fuel heat switch to ON position and observe valve open light (blue). Verify that valve open light illuminates brightly during valve transition and remains illuminated dimly at completion of the opening cycle.
(b)
Visually check position indicator on valve and verify that valve has fully opened.
(c)
The valve shall begin to close within 60 ± 5 seconds from the time the valve switch was placed in ON position. Verify that valve open light illuminates brightly during valve transition and is extinguished at completion of closing cycle.
(d)
Visually check position indicator on valve and verify that valve has fully closed.
B. Fuel Filter Icing Indicator Light and Master Warning Lights Test
(1)
Prepare for test.
(a)
Check that 28 volt dc bus No. 1 is energized.
(b)
Close MASTER CAUTION BUS, INDICATOR LIGHTS - MASTER DIMMING BUS, and DIM and TEST circuit breakers on panel P6-3.
(c)
Disconnect electrical connector from the fuel filter differential pressure switch.
(2)
Test fuel filter icing indicator light and master warning lights.
(a)
Jumper terminals A and B of disconnected connector and verify that amber warning light on P5-2 fuel module, fuel system annunciator light, and two master warning lights illuminate.
(b)
Place LIGHTS switch on panel P2-1 to DIM, verify that indicator lights dim.
(c)
Place LIGHTS switch to BRIGHT, verify that indicator lights return to original intensity.
(d)
Press either master caution light, verify that master caution lights and the fuel annunciator light are extinguished and the fuel filter icing indicator light remains illuminated.
(e)
Press either master caution annunciator, verify that both master caution lights and all annunciator lights remain illuminated as long as annunciator is depressed.
(f)
Release master caution annunciator, verify that only the master caution and fuel annunciator lights remain illuminated.
(3)
Restore airplane to normal configuration.
(a)
Remove jumper from terminals A and B of disconnected connector, verify that all lights are extinguished.
(b)
Connect electrical connector to fuel filter differential pressure switch.
(c)
Close left and right removable cowl panels for each engine. Refer to Chapter 71.
(d)
Determine if there is any further need for electrical power, if not, disconnect electrical power from airplane.
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May 15/67 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 73-14-0 Page 501
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FUEL HEAT (DEICING AIR) VALVE - REMOVAL/INSTALLATION
1. Prepare to Remove Fuel Heat (Deicing Air) Valve
A. Pull FUEL HEAT circuit breaker, for applicable engine, on circuit breaker panel P6.
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