28-43-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
FUEL TEMPERATURE INDICATION
Fuel Temperature Indication
Figure 2
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL
T445 MN TANK 1
FUEL TEMP SNSR
TO EIU ARINC 429 BUS
AND EICAS
FUEL SYSTEM CARD FILE
28V DC PWR
FUEL TEMP
SENSOR-HI
FUEL TEMP
SENSOR-LO
FUEL SYSTEM EICAS INTERFACE CARD-MAIN
Fuel Temperature Indicating System Simplified Schematic
Figure 3
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747-400 MAINTENANCE MANUAL
FUEL TEMPERATURE INDICATING SYSTEM - ADJUSTMENT/TEST
____________________________________________________
1. General
_______
A. This procedure contains two tasks for the fuel temperature indicating system:
(1)
The first task is an ambient temperature operational test which does a check to make sure the fuel temperature indicating system operates in ambient temperature.
(2)
The second task is a cold weather operational test which does a check to make sure the fuel temperature indicating system operates in very cold temperatures.
TASK 28-43-00-715-001
2. Fuel Temperature Indication System Ambient Temperature Operational Test
_______________________________________________________________________
A. Equipment
(1)
Container, 1/2 gallon (2 liter) capacity
(2)
Thermometer - mercury
B.
References
(1)
AMM 28-43-01/401, Fuel Temperature Bulb
C.
Access
(1)
Location Zone 573 Rear Spar to Inbd Aileron Leading Edge, Left
(2)
Access Panel
573CB Hydraulic Access Panel
D.
Procedure
S 025-002
(1) Remove the fuel temperature bulb from the No. 1 main tank (AMM 28-43-01/401).
NOTE: Do not disconnect the fuel temperature bulb from the airplane
____
wiring for this test.
S 865-003
(2)
Make sure this circuit breaker is closed:
(a)
P180 DC Power Distribution Panel 1) 180H17 FUEL SYSTEM EICAS INTFC CONT
(3)
Fill the container with water.
S 485-004
NOTE: The water must approximately be at ambient temperature.
____ The specific water temperature is not important for this procedure.
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747-400 MAINTENANCE MANUAL
S 485-005
(4)
At the same time, put the fuel temperature bulb and the mercury thermometer into the water.
S 215-006
(5)
Look at the mercury thermometer temperature.
S 215-010
(6)
Compare the temperature on the mercury thermometer with the temperature shown on the main EICAS display.
S 975-007
(7)
Make sure the temperature shown on the main EICAS display is in | 4°C the temperature shown on the mercury thermometer.
S 425-007
(8)
Install the fuel temperature bulb (AMM 28-43-01/401).
TASK 28-43-00-715-008
3. Fuel Temperature Indicating System Cold Weather Operational Test________________________________________________________________
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