0 Zero Missing or disconnected tank unit 1 Normal Tank contamination 2 Zero Bad HI-Z lead 3 *[1] Normal Bad compensator unit wiring 4 *[2] Zero Bad tank unit wiring 5 Normal Bad compensator unit 6 Zero Bad tank unit 7 Normal Contamination/water in compensator 8 Zero Bad fuel quantity indicator 9 Normal or zero Improperly calibrated indicator
Blank Bad fuel quantity indicator
*[1] Positioning the P15 test gage switch in TEST GAGES position logs error code 3 into the memory of the fuel quantity indicators.
*[2] If you push the FUEL QTY TEST switch on the P1-3 panel in the flight compartment, this makes an entry of error code 4 into the fuel quantity indicators.
B. To clear any stored error codes, including those stored by activating the self-test switches, cycle indicator power from ON to OFF to ON again, with the EP GND FUELING and fuel QTY circuit breakers on the P6 panel.
5. Refuel Quantity Indicator (Fig. 1)
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A. Refuel quantity indicators on the P15 panel show the weight of fuel in the fuel tanks. The refuel quantity indicators help the ground crew in refuel or defueling operations. The refuel quantity indicators are interchangeable with the fuel quantity indicators. The refuel quantity indicators operate only when the access door for the refuel station is open. When the access door is closed, power to the refuel quantity indicators is interrupted by a proximity switch.
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QUANTITY INDICATORS ú ú 01 Page 7 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
The fueling quantity indicators monitor the signal received from the fuel quantity indicators and display an error code if a system malfunction exists. The following table lists the error codes and their probable causes.
ERROR REFUEL QUANTITY PROBABLE
CODE____ INDICATOR READING_________________ CAUSE
A Zero Signal from fuel quantity indicator erroneous F Normal Error code on fuel quantity indicator Display flashing on Signal from fuel quantity indicator and off missing
Fuel Summation Unit (Fig. 1)
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A. The fuel summation unit takes the voltage signals from each fuel quantity indicator and sums them for an output voltage signal representative of the total fuel remaining. This output signal is one of several inputs to a flight management computer system which has a control display unit (CDU). The flight management computer converts these inputs into a display of total fuel remaining.
Capacitance Trimmers (Fig. 1)
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A. Capacitance trimmers, found on the forward left side of the control stand above the hand mike jack, can be adjusted to standardize the total tank capacitance. This adjustment permits replacement of fuel quantity indicators without recalibrating the indicator itself.
Fuel Measuring Sticks (Fig. 1)
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A. The fuel measuring sticks are used to measure the fuel quantity in the No. 1 and No. 2 tanks by mechanical means. Each main tank has five fuel measuring sticks, calibrated in inches, found in the tank access doors No. 1, 4, 6, 8, and 10. The fuel measuring stick unit of calibration is marked on each stick approximately 1 inch from the end.
B. The value on the fuel measuring stick and the applicable fuel measuringstick conversion document (Ref 12-11-04/301) help the ground crew in refuel operations when electrical power for the fuel quantity indicators is not available. The fuel measuring sticks are also used to compare the fuel weight shown by the fuel quantity indicators to the value shown by the fuel measuring sticks to make sure the fuel quantity indicator operates correctly.
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本文链接地址：737-300 400 500 AMM 飞机维护手册 燃油 FUEL 3(70)
