61-101-00802.EF2 (REV. G) CH. 3
January 7, 2015 Page 41 of 44
3. ALTERNATE CALIBRATION (WET TANKS)
Note: The Alternate Calibration should only be used as a temporary measure
when draining the facilities is not available. Recalibrate the aircraft using
the Preferred Calibration method at the first opportunity.
The Alternate Calibration applies the nominal empty tank capacitance value to
the system by test set for the indicator zero reading. A second capacitance
value, (equal to the combined value of nominal empty tank plus the equivalent
quantity of fuel in the tanks), is applied to the system. The indicator is then
adjusted to show the substituted fuel quantity.
Note: Measurements close to the Preferred Calibration, may be obtained if the
measured dry capacitance for specific serial number aircraft is known and
used instead of EMPTY values referenced in Table 2 (Tank Capacitance
Empty). The ADD FOR FULL values listed in Table 4 should be added to
the known values to obtain the CAP SIM value for FULL.
A. Aircraft Preparation
Note: See PRECAUTIONS and PRELIMINARY sections (Chapter 1).
(1) Insure the aircraft battery is disconnected.
Caution: When lowering or raising the pilot fuel panel, insure that the
aircraft battery is disconnected. Observe all safety
precautions.
(2) Access the indicator.
(3) Insure the circuit breakers are open.
(4) Insure the aircraft wiring plug at Indicator is disconnected.
B. Test Set Preparation
(1) Insure the test set switch is OFF.
(2) Rotate the TEST FUNCTION switch to CAP SIM CAL (NORM SYS).
(3) Set the INSULATION/SYSTEM switch to SYSTEM.
(4) Set the MAIN/TOT-AUX/NAC switch to MAIN/TOT.
(5) Set the 200 (pF)/1000 (pF) switch to 200 (pF).
C. Connecting the Test Set
(1) Determine the number of pins on the indicator connector and connect
the test set as shown in Figure 15 or Figure 16 accordingly.
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