(b)
If the IRS is not aligned: 1) Push the INIT REF button. 2) Make sure that the POS INIT page shows on the CDU. 3) Push the LSK (line select key) 6L button (adjacent to
<INDEX on the CDU screen display). 4) Make sure that the INIT/REF INDEX page shows. 5) Make sure that the PERF INIT page shows with the total fuel
quantity shown on the left side of the screen. 6) Push the LSK 3L, <PERF buttons.
(c) If the IRS is aligned: 1) Push the INIT REF button. 2) Make sure that the PERF INIT page shows with the total fuel
quantity shown on the left side of the screen.
S 655-014
(3)
Refuel the center tank to approximately 90% capacity (|10%).
S 825-015
(4)
Adjust the FULL adjustment screw on the fuel summation unit (Fig. 502) for the applicable center tank until the CDU display shows the total of all the fuel quantity indicators.
S 825-016
(5)
Do the two steps before this step again for the remaining tanks.
S 435-017
(6)
Install the top cover on fuel summation unit.
S 435-024
(7)
Put the fuel summation unit back into the panel.
G. Put the Airplane Back to Its Usual Condition
S 865-018
(1) Open these circuit breakers:
(a) P6, Main Power Distribution Panel
1) EP GND FUELING
2) QTY
S 095-019
(2) Remove all ground wires installed on the electrical connectors, pin
3.
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(3) S 435-020Connect the electrical connectors to the bussing plugs.
(4) S 865-021Close these circuit breakers: (a) P6, Main Power Distribution Panel 1) EP GND FUELING 2) QTY
(5) S 865-022Remove electrical power if it is not necessary for other tasks (Ref (Ref 24-22-00/201).
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737-300/400/500MAINTENANCE MANUAL
FUEL SUMMATION UNIT - ADJUSTMENT/TEST
_____________________________________
1. General_______
A. This section contains an operational test of the fuel summation unit (FSU). The fuel summation unit adds the total of the fuel quantity signals from the fuel tanks.
B. You read the fuel quantities for an empty tank and a full tank on the control display unit (CDU) of the flight management computer system (FMCS). The FMCS gets its fuel quantity data from the data on the fuel quantity indicators. Thus the precision of CDU data is not better than the precision of each fuel quantity indicator. If you are not sure that one or more of the fuel quantity indicators is accurate, do the check for the adjustment of the fuel quantity indicators (AMM 28-41-00/501, 28-41-02/501) before you do this task.
TASK 28-41-82-715-001
2. Fuel Summation Unit Test (Wet Tanks) (Recommended)__________________________________________________
A. References
(1)
AMM 12-11-00/301, Fuel
(2)
AMM 24-22-00/201, Manual Control (Apply Power)
B. Access
(1) Location Zones
101 Left Control Cabin
102 Right Control Cabin
C. Procedure
S 865-002
(1)
Supply electrical power (AMM 24-22-00/201).
S 655-003
(2)
Refuel all fuel tanks to approximately 60 percent of the full capacity (AMM 12-11-00/301).
S 215-004
(3)
Make sure these circuit breakers are closed:
(a) P6 Main Power Distribution Panel
1) QTY
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