747-400 AMM 飞机维护手册 发动机燃油和控制 2(95)

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 4.  Operation (Fig. 2)
_________
 A.  Functional Description
 (1)  
The fuel filter differential pressure switch closes before the fuel filter bypass valve opens to provde a warning that the fuel filter is becoming clogged. The bypass valve opens when the fuel filter inlet and outlet pressure increases to 9.0 psid (62.0 kPad).

 (2)  
On increasing differential pressure, the diaphragm pushes the pressure plate against the negative rate spring disc. At 5.0-6.0 psid (34.5-41.4 kPad) the spring disc snaps over center moving the pressure plate. This motion is transmitted from the pressure plate, through the wobble shaft, to the electrical switch.

 (3)  
The electrical switch closes, sending a 12 volt dc signal to the EFIS/EICAS interface units (EIU's). The EIU's interpret the signal and provide a status message to the auxiliary EICAS.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
MAIN FUEL 
SUPPLY HOSE (REF)  FUEL FLOW TRANSMITTER (REF) 
SEE  A 

EEC FUEL TEMPERATURE THERMOCOUPLE PROBE
(REF)  FUEL FILTER DIFFERENTIAL PRESSURE SWITCH S1585 SEE BFUEL FILTER HOUSING
MAIN GEARBOX (REF) FWD
A
HOUSING FUEL FILTER FWD 
B 
Fuel Filter Differential Pressure Switch Location Figure 1 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
DM7353
M7353 EIU-3
DM7352
P
M7352 EIU-2
DS1585
DM7351
DS1585

M7351 EIU-1
S1585 FUEL FILTER DIFFERENTIAL E2-6 EIU RACK
PRESSURE SWITCH
Fuel Filter Bypass Warning System Simplified Schematic
Figure 2

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
FUEL FILTER BYPASS WARNING SYSTEM - ADJUSTMENT/TEST
___________________________________________________
 1.  General
_______
 A.  This section gives a system test procedure for the bypass warning system for the fuel filter. This test is done to make sure the bypass warning system operates correctly. An operational test is not given it is necessary to have a clogged fuel filter.
 B.  When you do the system test, a pressure adapter is attached to the differential pressure switch S1585 for the fuel filter and air pressure is supplied to the differential pressure switch.
 C.  The differential pressure switch is installed at the top of the fuel filter housing of the fuel pump. The fuel pump is installed to the forward face of the main gearbox at the 5 o'clock position.
 D.  You can get access to the differential pressure switch through the right thrust reverser.
 TASK 73-34-00-735-001-N00
 2.  System Test - Fuel Filter Bypass Warning System (Fig. 501)
_______________________________________________
 A.  Special Tools and Equipment
 (1)  
66-201 Adapter - Pressure, Custom Component Switches Inc., P.O. Box 2516, Chatsworth, CA 91313

 B.  
Standard Tools and Equipment

 (1)  
Air Source - Compressed Dry Filtered, 0-15 psi
 (0-100 kPa)

 (2)  
Container - 5 gallon (20 liter) capacity used
 to collect the fuel

 (3)  
Gauge - Pressure, 0-15 psi (0-100 kPa) range,
 |1% accuracy

 (4)  
Valve - Shutoff

 (5)  
Valve - Vent

 C.  
Consumable Materials

 (1)  
D00390 Oil - Engine

 (2)  
　
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