61-101-00802.EF2 (REV. G) CH. 2
January 7, 2015 Page 20 of 44
(6) Set the 200 (pF)/1000 (pF) switch to 200 (pF).
(7) Press and hold the PRESS TO READ CAP (pF) pushbutton.
(8) If testing 1900/1900C, UA and UB, rotate the Probe Selector Unit
switch until all probes are tested.
(9) If testing a/c serial numbers UC and UE, and using Probe Selector
Unit P/N 118-389004/935, set the ALL/EACH switch to EACH, the
MAIN/AUX switch to MAIN. Then, rotate the switch through the MAIN
probe positions to take readings. To read the AUX probes, set the
ALL/EACH switch to the ALL position, the MAIN/AUX switch to the
AUX and the BOTH/EACH switch to BOTH to take readings. If also
testing individual AUX probes, set the ALL/EACH switch to EACH, the
BOTH/EACH switch to EACH and rotate the switch through the two
AUX probe positions and take readings.
(10) Verify that the value shown for each probe is within the tolerances
specified in Table 4, or Table 5 (for empty tanks) or Table 6, or Table
7 (for full tanks).
Note: If any probe capacitance is out of specifications, refer to the
A/C Maintenance Manual for proper procedures.
(11) Set the T/S ON/OFF switch to OFF.
E. Disconnecting/Reconfiguring
(1) Disconnect the test set ACFT connector from the adapter cable.
(2) Disconnect the adapter cable from the Fuel Probe Selector Unit.
(3) If testing 1900/1900C, UA and UB serial numbers, disconnect the
Fuel Probe Selector Unit from the Interconnect Fuel Line Receptacle
connector. If testing serial numbers 1900C/1900D, UC and UE serial
numbers, disconnect the Fuel Probe Selector Unit from the Main and
Aux Harness.
(4) Connect the Interconnect Fuel Line receptacle connector to the
aircraft wiring plug (1900/1900C, UA and UB or connect the Main and
Aux Harness disconnect to the aircraft wiring plugs 1900C/1900D, UC
and UE).
(5) Return the aircraft to its original configuration.
Note: If testing the opposite side of the a/c, repeat and follow same
procedure.
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