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A 737-300/400/500MAINTENANCE MANUAL
FUEL
FUEL SUMMATION UNIT
A
Fuel Summation Unit Installation
Figure 401
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A54849
A
737-300/400/500MAINTENANCE MANUAL
FUEL SUMMATION UNIT - ADJUSTMENT/TEST
_____________________________________
1. General_______
A. The fuel summation unit (FSU) on the P23 panel adds the fuel quantity signals from the fuel tanks.
B. The system adjustment or calibration adjusts the FSU to get an empty tank and full tank fuel quantity indication on the control display unit (CDU) of the flight management computer system (FMCS) (Ref Chapter 34).
C. You get the total fuel quantity indication from the indications of the fuel quantity indicator(s). The precision of the CDU indication is not better than the precision of each fuel quantity indicator. If you are not sure about the precision of the fuel quantity indicators, do the task: "System Adjustment - Fuel Quantity Indicating System" (AMM 28-41-00/501, 28-41-02/501) before you do this procedure.
D. This procedure uses a Model GTF-2 system tester. If a different tester is used, refer to the instructions supplied with that tester.
TASK 28-41-81-825-001
2. Fuel Summation Unit (FSU) Adjustment____________________________________
A. Special Tools and Equipment
(1) Leading Edge Flap Actuator Locks - F80048-84
B. References
(1)
24-22-00/201, Manual Control
(2)
27-81-00/201, Leading Edge Flap and Slat Control System
C. Access
(1) Location Zones
221 Center Section Fuel Tank
305 Left Fuel Tank
405 Right Fuel Tank
D. Prepare for the Adjustment
S 865-002
(1) Supply electrical power (Ref 24-22-00/201).
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737-300/400/500MAINTENANCE MANUAL
S 865-025
WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE
AND TE FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP
CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL
MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP
CONTROL LEVER. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO
EQUIPMENT.
(2) Extend the leading edge flaps (Ref 27-81-00/201).
S 495-026
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO
_______ INSTALL THE LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT INSTALL THE SAFETY LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(3)
Install safety locks on the leading edge flaps (Ref 27-81-00/201).
S 215-003
(4)
Do a check of the P2 fuel quantity indications.
S 865-006
(5)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P6 Main Power Distribution Panel 1) EP GND FUELING 2) QTY
S 035-007
(6)
For the tanks that are not empty, disconnect the electrical connector(s) from the bussing plugs at wing spar locations (Fig. 501).
S 495-008
(7)
Connect a ground wire from pin 3 of the indicator electrical connector(s) to the airplane ground.
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