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MIL-T-81838(AS)
When K = dielectric constant of the fuel being used.
C  E = 35.5 mmf
C  A = 59.6 mmf
C  F obtained with MD-2 tester should be within + 1.5% of the calculated CF.
Calculated CF using nominal dielectric constant (K = 2.070) of JP-4 is:
C  F = 2.070 x 35.5 x 59.6 = 133.1 mmf
4 . 6.2.4.3.2
Insulation resistance check - Resistance should be 200
megohms or greater for "A" to "B", "A" to "GND", and "B" to "GND".
4.6.3
P r e s s u r e test - The pressure relief valve and other open-
ings, except one for applying pressure shall be sealed and the tank shall be sub-
jected to the pressure tests of 4.6.3.1 or 4.6.3.2 as applicable. During these
tests, leakage of the tank shall be detected by filling the tank with air and sub-
mersion of the tank in water or by coating with a soap solution or by filling the
tank with a fluorescent dye and examining the exterior surface with an ultraviolet
lamp.
4.6.3.1
Pressure test o f individual tanks - Each production tank
shall be pressure tested to an internal negative pressure of 7 psig for 3 minutes,
an internal positive pressure of 75 psig for 3 minutes and an internal positive
pressure of 15 psig for 35 minutes. These tests shall be made without leakage or
failure except a leakage check is not required on the negative pressure test.
4.6.3.2
P r e s s u r e test f o r first article a n d sampling test - The tank
shall be subjected to 86 psig for 3 minutes and 15 psig for 15 minutes without
leakage or failure.  These tests shall be conducted prior to slosh and vibration
testing (Para. 4.6.4). Following the slosh and vibration test, the tank shall be
subjected to an internal positive pressure of 112 psig for 3 minutes, a negative
pressure of 10 psig for 3 minutes and a positive pressure of 15 psig for 15
minutes without leakage or failure.
4.6.4
V i b r a t i o n a n d slosh - The tank skill be subjected to the
vibration and slosh tests as specified in MIL-V-7173 except that the 25 hours shall
consist of 12-1/2 hours in the pitch condition and 12-1/2 hours in the roll condition.
The centerline of the tank shall be at least 20 inches above the slosh axis. The
tank shall be suspended from the 30 inch lugs on an AERO-7A bomb rack. The
tank shall be pressurized to 25 psig during the test. The minimum displacement
15

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