56-101-01501_01502 Revision D
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11. SYSTEM CALIBRATION, ALTERNATE (WET TANK)
The tanks may have any amount of fuel. This procedure yields a limited accuracy and should
be followed by the preferred calibration at the next opportune time. The Fuel Quantity Indicator
may contain all the system measurement circuitry, or a major portion may be contained in
separate units referred to as signal conditioners or amplifiers. The procedure is similar, only the
location of the units and their adjustments will be affected.
A.
Aircraft Preparation
(1) The Aircraft does not have to be defueled for this test.
CAUTION:
FUEL QUANTITY, REFUEL, AND DEFUEL POWER MUST BE
TURNED OFF WHILE ACCESSING AND BEFORE ANY HARNESS,
CABLE OR CONNECTOR IS REMOVED. POWER MUST REMAIN
OFF UNTIL CONNECTIONS ARE MADE AS SPECIFIED AND UNTIL
POWER REQUIREMENT IS CALLED OUT.
(2) Open appropriate Fuel Quantity System circuit breaker(s).
CAUTION:
REFER TO AIRCRAFT MAINTENANCE MANUAL FOR ACCESSING
PROCEDURES, FOLLOW ALL PRECAUTIONS THEREIN.
(3) Gain access to the cockpit indicator or the appropriate Fuel Quantity System electrical
connector(s) necessary for this procedure.
(4) Disconnect at the cockpit indicator or the appropriate electrical connector(s).
B.
Connecting Test Set
(1) Locate the equipment conveniently for the following procedures.
(2) Connect to the Test Set the Adapter Cable specific for the Aircraft being tested, as
shown in Figure 19 or as directed in the Adapter Cable Instructions.
(3) Connect the Adapter Cable between the Indicator and the aircraft wiring plug.
(4) Connect the ground lead from the adapter (if so equipped) or from the Test Set GND
receptacle, to a secure airframe ground.
Figure 19
Aircraft Preferred Calibration Configuration
CHASSIS
AIRFRAME
GND
A/C
IND
ACFT
IND
DFQ40K
SM
GND
COMP
HI-Z
Com Link
-
+
INPUT
4W
LO-Z
HI-Z
COMP
GND
LO-Z
HI-Z
COMP
LO-Z
INDICATOR
WIRING
AIRCRAFT
A/C
IND
Adapter Cable