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 (2)  Remove the flap locks from the leading edge flaps (AMM 27-81-00/201).
 S 864-025 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______
 FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAPS.  THE
 FLAPS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (3)  Retract the leading edge flaps (AMM 27-81-00/201).
 S 864-019
 (4)  Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P6 Main Power Distribution Panel 1) TANK 1 BOOST PUMP FORWARD 2) TANK 1 BOOST PUMP AFT 3) TANK 2 BOOST PUMP FORWARD 4) TANK 2 BOOST PUMP AFT 5) CENTER TANK BOOST PUMP LEFT 6) CENTER TANK BOOST PUMP RIGHT 7) FUEL CONT NO. 1 AFT NO. 2 FWD CTR L 8) FUEL CONT NO. 1 FWD NO. 2 AFT CTR R
 S 714-020
 (5)  Do this task: Fuel Feed Low Pressure Indicating System Test (AMM 28-42-00/501).

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A
737-300/400/500MAINTENANCE MANUAL
 FUEL TEMPERATURE INDICATING SYSTEM - DESCRIPTION AND OPERATION
______________________________________________________________
 1.  General_______
 A.  The fuel temperature indicating system allows the fuel temperature in tank No. 1 to be read on the indicator located on the forward overhead panel. A temperature sensing bulb is located in fuel tank No. 1.
 B.  The temperature bulb contains a resistance element whose resistance varies in proportion to changes in temperature. This element controls the current passing through the meter movement of the fuel temperature indicator. Power is supplied to the system through 28v ac bus No. 2 in the P6 panel (Fig. 1).
 2.  Fuel Temperature Bulb (Fig. 2)_____________________
 A.  The temperature bulb is an armored, bayonet locking-type bulb. It has a temperature range of -50 to +300°C. The bulb is contained in a housing which projects into tank No. 1 through the rear spar. The housing is integral with the tank wall, and allows the bulb to be removed without draining the tank.

FUEL TEMPERATURE INDICATOR
Fuel Temperature Indicating System Schematic Figure 1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500MAINTENANCE MANUAL 
FUEL VALVE  FUEL VALVE 
CLOSED B  0  CLOSED B 
-20 -40 +40 +20TEMP FUEL  INDICATOR FUEL TEMPERATURE  TANK NO. 1 
` C 
FILTER  VALVE  FILTER 
ABYPASS  OPEN  B  ABYPASS 
CROSS  FEED 
FORWARD OVERHEAD PANEL 
FUEL 
TEMPERATURE 
BULB 
SEE  A 

WING REAR SPAR 
FUEL TANK NO. 1 
TEMPERATURE 
BULB LEADS 
TEMPERATURE BULB 
LOCKING CAP 
FUEL TEMPERATURE 
BULB (SHOWN IN 
INSTALLED POSITION -
BULB NOT VISIBLE) 

A

Fuel Temperature Indicating System Equipment Location
Figure 2

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A 737-300/400/500MAINTENANCE MANUAL
 3.  Fuel Temperature Indicator (Fig. 2)
__________________________
 A.  The fuel temperature indicator, located on the P5 panel is a resistance ratiometer instrument. The indicator is operated by the ratio of the currents through two coils in the meter movement. One of these currents is determined by the resistance of the temperature bulb. The indicator dial is calibrated in degrees centigrade and reads from -56 to +56°C. With power off, the pointer remains off scale at the low temperature end.
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