747-400
MAINTENANCE MANUAL

FWD
SEE A
HYDRAULIC
RESERVOIR FWD
HYDRAULIC FLUID QUANTITY TRANSMITTER
A
Hydraulic Fluid Quantity Transmitter Location Figure 1
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A

747-400
MAINTENANCE MANUAL

P5 OVERHEAD PANEL
SEE A
SEE B
SYSTEM FAULT LIGHT
FAULT SYS  FAULT SYS  HYD  FAULT SYS  SYS FAULT  EDP OFF  EDP OFF  EDP OFF  EDP OFF 
PRESS  PRESS  PUMPS  PRESS  PRESS  DEMOFF  AUX  DEM  DEMOFF  OFF DEM  AUX 
AUTO OFF  ON  OFF AUTO  ON  OFF AUTO  ON  OFF AUTO  ON  SOV  SOV  SOV  SOV 

RSVR AUX DEMAND
PRESS
AUX 12 34
0.75 0.75 QTY 0.10RF 1.35
ON ON ON ON
3250 3250 PRESS 0 3250
ENGINE
50 50 TEMP 10 50 1 234
PRESS PRESS PRESS PRESS
HYDRAULIC CONTROL MODULE
EICAS HYD PAGE
A
(AUXILIARY EICAS DISPLAY) B
Hydraulic Pressure Indication Figure 2
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A
747-400
MAINTENANCE MANUAL

 (3)  
When the fluid quantity is between 0.35 and 0.75, a RF (refill) message will show. This message shows adjacent to the digital indication of the hydraulic quantity on the auxiliary EICAS display. This refill message shows on the EICAS status, synoptic, and maintenance displays. This refill message shows only when the airplane is on the ground.

 (4)  
When the fluid quantity is 1.15 or more, an OF (overfull) message will show. This message shows adjacent to the digital indication of the hydraulic quantity on the auxiliary EICAS display. This overfull message shows on the EICAS maintenance display when the airplane is on the ground.

 (5)  
The SYS FAULT light will come on if the fluid quantity is 0.34 (34% full) or less. This amber light is on the hydraulic control panel.

 (6)  
The EICAS advisory message, HYD QTY SYS (1, 2, 3 or 4), will show if the fluid quantity is 0.34 or less. This message will show on the auxiliary EICAS display unit.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 HYDRAULIC FLUID QUANTITY TRANSMITTER - REMOVAL/INSTALLATION
___________________________________________________________
 1.  General_______
 A.  This procedure has two tasks. The first task removes the hydraulic fluid quantity transmitter (referred to as the transmitter). The second task installs the transmitter.
 B.  You must open the doors in the trailing edge fairing to get access to the transmitter.
 C.  The outboard and inboard transmitters are not interchangeable. The inboard transmitter is shorter than the outboard transmitter. A transmitter will not show the correct fluid quantity if you install it in an incorrect hydraulic reservoir.
 TASK 29-33-01-004-001
 2.  Hydraulic Fluid Quantity Transmitter Removal (Fig./401)____________________________________________
 A.  Standard Tools and Equipment
 (1)
Container - for hydraulic fluid, 15 gallon (60 liters) capacity

 B.  
References

 (1)
AMM 29-11-00/201, Main Hydraulic Supply System

 (2)
AMM 36-00-00/201, Pneumatic System

 (3)
AMM 54-62-00/201, Nacelle Strut Access Panels

 C.  
Access

 (1)  
　
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