61-101-00802.EF1 Revision J Page | 14
4. PREFERRED CALIBRATION TEST
Note: Refer to Precautions and Preliminary in General Information section.
Note: When draining facilities are not readily available, the Alternate Calibration Procedure
(see Chapter 2, section 3. ALTERNATE CALIBRATION (WET TANKS)) may be
used as a temporary measure.
Note: The preferred calibration is done with dry tanks. This method is the most accurate
for calibration since the indicator zero reading is set to the actual empty tank
condition. A capacitance value, applied to the system by the T/S, is substituted for
an equivalent quantity of fuel in the tanks. The Indicator is adjusted to read the
substituted fuel quantity.
A. Aircraft Preparation
CAUTION: REFER TO THE AIRCRAFT MAINTENACE MANUAL FOR PROPER
DEFUELING AND FUELING PROCEDURES. OBSERVE ALL SAFETY
PRECAUTIONS.
(1) Ensure aircraft is defueled. Drain pumps.
(2) Disconnect aircraft battery.
CAUTION: WHEN RAISING OR LOWERING THE PILOT FUEL PANEL, ENSURE
AIRCRAFT BATTERY IS DISCONNECTED.
(3) Gain access to applicable Indicator.
(4) Open the circuit breakers.
(5) Disconnect aircraft wiring plug at the indicator.
B. Test Set Preparation
(1) Ensure T/S ON / OFF 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).
(6) Set the CAP SIM (pF) 100’s thumbwheels to “-“. Set the 10’s to “9”.
C. Connecting Test Set
(1) Connect the T/S as shown in either Figure 5 or Figure 6 and the following steps.
Note: Figure 5 depicts using Adapter Cable 101-00831 for conversion to systems with
circular style connectors.
(2) Connect T/S IND connector to Indicator.
(3) Connect T/S ACFT connector to aircraft wiring plug.
D. Test
(1) Set T/S ON / OFF switch is ON.
(2) Press and hold PRESS TO READ CAP (pF) pushbutton while adjusting CAP SIM
(pF) control knob to obtain a T/S reading according to Table 4.
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