CONTROL/
INDICATOR
TEST
DEGRADED light
EXTERNAL
*RIGHT NO FLOW light
*INBD EMPTY light
*OUTBD EMPTY light
*LEFT NO FLOW light
*INBD EMPTY light
*OUTBD
EMPTY
light
VENT SENSOR
*OVFL
FUNCTION
Checks display and indicator lights. Performs memory checksum, displays 8 sequentially in each digital display. Veri.es that temperature probe is connected; veri.es that .ow meter is connected; performs trial calculation based on a known temperature and .ow meter input, compares it with a known good value, and displays setting of fuel density switch. At completion of test, GOOD or error code will be displayed (Table 4-2).
Error in critical function has occurred. Error code will be displayed as shown under TEST. Only E02 error will allow microprocessor to clear failure code and regain fuel remaining information by doing two self-tests.
Fuel .ow does not exit from selected right tank.
Not used.
Right outboard tank fuel exhausted.
Fuel .ow does not exit from selected left tank.
Not used.
Left outboard tank fuel exhausted.
Detects the presence of fuel on the vent thermistor.
Indicates fuel venting overboard.
Change 2 4-41
CONTROL/ FUNCTION
INDICATOR
NOTE
Illumination of this capsule on the Fuel Management Panel will cause illumination of the AUX FUEL caution legend and the MASTER CAUTION light. Pushing the STATUS button will reset the NO FLOW, AUX FUEL and the MASTER CAUTION lights, but does not correct the no .ow condition.
FAIL Open in vent sensor line.
4.10.4 External Extended Range Fuel Quantity In-dicating System. The AUX FUEL QTY POUNDS digital readout (Figure 4-18) displays the amount of fuel remaining. Fuel type is preset by switches in the AUXIL-IARY FUEL MANAGEMENT panel. Preset can only be done when the helicopter weight is on the wheels. When measuring quantity, the readout is used in conjunction with the rotary selector switch to select tank pair subtotal, or TOTAL remaining in all tanks. Fuel used is sensed from a common .ow transmitter within the fuel line to the main tanks. This amount is subtracted from the preset fuel quan-tity input and is displayed on the digital readout as pounds remaining. A DEGRADED light will go on, when a com-plete failure has occurred in the microprocessor, or an error condition is detected by the microprocessor, or when the temperature sensor has failed. Power for the fuel quantity subsystem is provided from the No. 2 ac primary bus through a circuit breaker marked AUX FUEL QTY,onthe mission readiness circuit breaker panel.
4.10.5 Auxiliary Fuel Management Control Panel Test.
1.
TEST button -Press. Digits should display 8’s and DEGRADED and VENT SENSOR (FAIL and OVFL) lights should illuminate.
2.
TEST button -Release. Digits should display 8’s in sequence from left to right three times; 5 seconds later, display GOOD or EO failure code; 3 seconds later, display type fuel density, then fuel TOTAL.
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