747-400 AMM 飞机维护手册 发动机燃油和控制 2(89)

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105 N2 1.2 15  105 1.2 N 2 15  OIL T OIL Q VIB  103 0.5 N 2 19  N 1.2 2 15 107  65 105 15 1.2N 2  A OIL P OIL T OIL Q VIB 65 105 15 1.2N2 12 103 19 0.5 66 107 15 1.2N 2 N2 CAB ALT DUCT PRESS12 ~P200 RATE7500 LDG ALT 12 +250 5.6  D N U P D N D N F L A P S 5 D N TOTAL FUEL 345.0 +10cTEMP 
AUXILIARY EICAS DISPLAY  COMPACTED EICAS DISPLAY 
A  A  OR  B 

Fuel Flow Indication
Figure 2

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
DM7353
M7353 EIU-3
DM7352
M7352 EIU-2
START
DM7351
DM7192
STOP
M7351 EIU-1 M7192 ENG FUEL E2-6 EIU RACK FLOW TRANSMITTER

Fuel Flow Indicating System Simplified SchematicFigure 3
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(5)  
As the spring attempts to turn the impeller, the impeller has to impart rotation to the fuel flowing through it. As the impeller attempts to turn the fuel flow, the impeller deflects, which lets a rotational deflection between the drum and the impeller.

 (6)  
The drum and impeller each have two magnets installed in them on the opposite sides. As the drum and impeller turn, the magnets generate the pulse signals in the pickoff coils. The pulse signals are called stop and start pickoff signals.

 (7)  
The start and stop pickoff signals have a frequency that is proportional to the impeller and drum speed. The rotational deflection between the drum and impeller causes a phase lag between the stop and start pickoff signals. As the fuel flow increases, the frequency and phase lag increases.

 (8)  
The stop and start pickoff signals are sent to the EIU where the frequency and phase lag are translated to a fuel flow display on the auxiliary EICAS.

IMPELLER MAGNET

Fuel Flow Transmitter Flow Diagram
Figure 4

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
FUEL FLOW TRANSMITTER - REMOVAL/INSTALLATION
____________________________________________
 1.  General
_______
 A.  This procedure gives the instructions to remove and install the fuel flow transmitter, M7192.
 B.  The fuel flow transmitter is installed at approximately the 4 o'clock position on the high pressure compressor (HPC). The fuel flow transmitter is attached to the inlet of the fuel distribution valve.
 C.  You can get access to the fuel flow transmitter through the right thrust reverser.
 TASK 73-31-01-004-001-N00
 2.  Remove the Fuel Flow Transmitter (Fig. 401)
________________________________
 A.  Standard Tools and Equipment
 (1)  
Container - 1 gallon (4 liter) capacity, used
 to collect the fuel

 B.  
Consumables

 (1)  
D00137 Engine Oil - PWA 521

 C.  
References

 (1)  
AMM 71-11-04/201, Fan Cowl Panels

 (2)  
AMM 71-11-06/201, Core Cowl Panels

 (3)  
AMM 78-31-00/201, Thrust Reverser System

 (4)  
IPC 73-11-03 Fig. 1

 (5)  
IPC 73-21-07 Fig. 13

 (6)  
IPC 73-31-01 Fig. 1

 (7)  
WDM 73-31-11, 73-31-12, 73-31-13, and 73-31-14

 (8)  
SSM 73-31-01

 D.  
Access

 (1)  
Location Zone
 412 Engine 1 - HPC Case 4 o'clock
 422 Engine 2 - HPC Case 4 o'clock
 432 Engine 3 - HPC Case 4 o'clock
　
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