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747-400
MAINTENANCE MANUAL

 ~.............................................................................. | COMPONENT | OPERATIONAL TEST PROCEDURE | ................................................................................ |Boost Pump |AMM 28-22-00/501 | ................................................................................ |Override/Jettison Pump |AMM 28-22-00/501 | ................................................................................ |APU Boost Pump |AMM 28-25-00/501 | 2.......................................…......................................1
 F. Put the Airplane Back to the Usual Condition
 S 414-014
 (1)  Install the access door, 573AT or 673AT, if you removed it.
 S 094-024
 WARNING:_______ YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
 DOOR LOCKS FROM THE LANDING GEAR DOORS.  THE DOORS CAN CLOSE
 QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY.  THIS

 CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  
Do this task: Removal of the Door Locks on the Wing Landing Gear (AMM 32-00-30/201).

 S 094-027

 (3)  
Do this task: Removal of the Door Locks on the Body Landing Gear (AMM 32-00-30/201).

 S 094-026
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT DO THE STEPS CORRECTLY. THIS CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (4)  
Do this task: Safety Lock Removal and Leading Edge Flap Activation (AMM 27-81-00/201).

 S 864-019

 (5)  
Do this Task: Leading Edge Flap Retraction (AMM 27-81-00/201).

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747-400 MAINTENANCE MANUAL
 FUEL TEMPERATURE INDICATING SYSTEM - DESCRIPTION AND OPERATION
______________________________________________________________
 1.  General_______
 A.  The fuel temperature indicating system measures the temperature of the fuel in the No. 1 main tank and displays the temperature on the main EICAS screen at all times.
 B.  The system is operational when 28-volt dc power is supplied to the fuel system/EICAS interface card - main (FSEIC) from the 28V DC Bus 3.
 2.  Fuel Temperature Bulb (Fig. 1)_____________________
 A.  The fuel temperature bulb consists of a temperature-sensitive element enclosed in a metal case. The bulb is installed in the No. 1 main tank, mounted in an adapter on the rear spar. Resistance of the element varies with fuel temperature.
 3.  Operation (Fig. 2 and 3)_________
 A.  Functional Description
 (1)  When 28-volt dc power is supplied to the FSEIC, the system is operational. The FSEIC sends a signal to the temperature bulb and measures the bulb resistance on the return signal. Resistance value is converted to temperature at the FSEIC and data is sent to EICAS, through a digital data bus. The fuel temperature is displayed on the main EICAS screen.
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747-400
MAINTENANCE MANUAL

SEE B
SEE A
NACELLE STRUT
AFT FIXED FAIRING

A
TEMPERATURE BULB ADAPTER
ELECTRICAL CABLE
FUEL TEMPERATURE
BULB T445
LEFT WING
REAR SPAR

HYDRAULIC ACCESS PANEL NO. 573CB
B

Fuel Temperature Indicating System Component Location
Figure 1

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