(2)
Thermometer - Mercury, -30 F (-40 C) capability
B.
Consumable Materials
(1)
G00065 Antifreeze - Ethylene Glycol
(2)
G00263 Dry Ice
C.
References
(1)
AMM 28-43-01/401, Fuel Temperature Bulb
D.
Access
(1)
Location Zone 573 Rear Spar to Inbd Aileron Leading Edge, Left
(2)
Access Panel
573CB Hydraulic Access Panel
E.
Procedure
S 025-009
(1)
Remove the fuel temperature bulb from the No. 1 main tank (AMM 28-43-01/401).
S 865-010
(2)
Make sure this circuit breaker is closed:
(a)
P180 DC Power Distribution Panel 1) 180H17 FUEL SYSTEM EICAS INTFL CONT
S 865-011
(3) Slowly add the small pieces of dry ice to approximately one quart of ethylene glycol (anti-freeze) in an applicable container.
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A
747-400 MAINTENANCE MANUAL
S 485-012
(4) While the same time, put the fuel temperature bulb and the mercury thermometer into the ethylene glycol and dry ice mixture.
S 215-008
CAUTION:_______MONITOR THE TEMPERATURE OF THE MIXTURE. ETHYLENE GLYCOL BECOMES SOLID (FREEZES) AT APPROXIMATELY -40°F (-40°C). DAMAGE TO THE EQUIPMENT COULD OCCUR IF THE ETHYLENE GLYCOL BECOMES SOLID (FREEZES).
(5)
As the temperature on the mercury thermometer shows -22°F (-30°C), compare the temperature of the mercury thermometer to the temperature shown on the main EICAS display.
S 975-009
(6)
Make sure the temperature shown on the main EICAS display is in | 4°C the temperature shown on the mercury thermometer.
(7)
Install the fuel temperature bulb (AMM 28-43-01/401).
S 425-014
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
FUEL TEMPERATURE BULB - REMOVAL/INSTALLATION
____________________________________________
1. General
_______
A. This procedure contains instructions to remove and install the fuel temperature bulb, T445.
B. The bulb is installed in an adapter assembly, found on the rear spar of the No. 1 main fuel tank. Access to the bulb is through the hydraulic access panel, 573CB.
C. The adapter assembly is attached to the rear spar and must not be removed with the fuel temperature bulb.
NOTE: If you loosen or remove the adapter assembly, fuel will come out
____
of the fuel tank.
TASK 28-43-01-004-001
2. Fuel Temperature Bulb Removal (Fig. 401)
_____________________________
A. References
(1)
AIPC 28-43-01, Fig. 1
(2)
SSM 28-43-01
(3)
WDM 28-43-12
B.
Access
(1)
Location Zone 573 Rear Spar to Inbd Aileron Leading Edge, Left
(2)
Access Panel
573CB Hydraulic Access Panel
C.
Procedure
S 864-002
(1)
Open this circuit breaker and attach a DO-NOT-CLOSE tag:
(a)
P180 DC Power Distribution Panel 1) 180H17 FUEL SYSTEM EICAS INTFC CONT
S 014-003
(2)
Remove the aft fixed fairing on the No. 2 engine nacelle strut.
(3)
Open the hydraulic access panel, 573CB.
S 034-005
(4)
Disconnect the electrical cable on the fuel temperature bulb from the airplane leads at the splice.
S 014-004
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