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|  MIL-T-81838(AS)
Tank shall be fueled to demonstrate compliance with para-
4.6.2.3.16
graph 3.11.
The following procedure shall be used for checking the fuel
4.6.2.4
quantity gages. This test may be run as part of the test described in paragraph
4.6.2.3.
4.6.2.4.1
Equipment required -
4.6.2.4.1.1
MD-2 Capacitance Bridge and Resistance Tester or TF-20-1
Liquid Quantity capacitance test set or equivalent.
4.6.2.4.1.1.1
The procedures herein apply to the MD-2 Tester. In the
event a tester other than the MD-2 tester is used, the contractor shall submit the
proposed test procedures to NADC, Johnsonville (Code MAEM) for acceptance 60
days prior to initiation of tests.
4.6.2.4.1.2
Wire harness as shown in Figure 2.
4.6.2.4.1.3
Electrical disconnect plug.
E m p t y tank - With the fuel probe installed in the empty tank,
4.6.2.4.2
connect MD-2 tester per instructions accompanying the tester and Figure I. Con-
nect the MD-2 tester leak marker "A" (coaxial) to the 564PH-1 connector of thie
B298-1 plug. Connect the MD-2 tester lead marked "B" (unshielded) to the
5641P6-1 connector of the B298-1 plug. Connect B298-1 plug to B299-1 socket on
drop tank.
Capacitance check - MD-2 should read 95.13 1.0 mmf.
4.6.2.4.2.3
Insulation resistance check - MD-2 should read 500 megohms
4.6.2.4.2.2
or greater for "A" to "B", "A" to "GND" and "B" to "GND" under relative humidity
condition of not more than 50%.
(Note: MD-2 tester tolerance 1/8 inch (length of scale))
F u l l tank -
4.6.2.4.3
4.6.2.4.3.1
With the tank full of fuel and the MD-2 tester connected as
in paragraph 4.6.2.7.2.2 read the full capacitance (CF) of the probe. Compare the
value of CF as obtained with the MD-2 tester to the CF value as calculated by the
following formula:
C F = K x CE x CA
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