61-101-00802.EF2 (REV. G)
CH. 2
January 7, 2015
Page 11 of 44
(7) At the Fuel Probe Selector Unit, select a probe.
(8) Rotate the INS TEST POINTS selector to each position for each
probe and test every probe.
Note: If testing aircraft serial numbers UC or 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.
(9) Verify that the T/S reading for each probe is less than 50 nS (the total
conductance of ALL probes should not be greater than 50 nS)
EXCEPT when the selector is in the SIG/RTN position.
Note: When reading are taken on an individual probe or several
probes in parallel, readings when the switch is in the SIG/RTN
pos will range between 1500 and an “overrange” of 1.
If P/N 114-389001-17 probe (Gull Airborne) is installed in the
collector tank, an “overrange” reading will also appear when
the INS TEST POINTS switch is set in the LO-Z/RTN position.
(10) Set the T/S ON/OFF switch to OFF.
E. Disconnecting/Reconfiguring
(1) Disconnect the T/S ACFT connector from the adapter cable.
(2) Disconnect the adapter cable from the Fuel Probe Selector Unit.
(3) Disconnect the Fuel Probe Selector Unit from the Interconnect Fuel
Line Receptacle connector (for 1900/1900C, UA and UB aircraft serial
numbers) or from the Main and Aux Harness disconnects (for 1900D
and UC and UE aircraft serial numbers).
(4) Connect the Interconnect Fuel Line Receptacle connector to the
aircraft wiring plug (for UA and UB S/N’s) or connect the MAIN and
ZUX Harness disconnects to aircraft wiring plugs (UC and UE S/N’s
and 1900D)
(5) Return the aircraft to its original configuration.
Note: Repeat procedure to test the opposite side.
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