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|  MIL-T-82570A(OS)
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4.4.5.8.2 Alternative test. As an alternative test to 4.4.5.8.1, heater
current drain may be measured. With the input voltage to the heater element
adjusted to 115 plus or minus 0.5 volts, 60 Hz ac, an ac ammeter connected
in the circuit, and the training gear heater switch placed in the ON posi-
tion, the input current shall be 16.7 amps plus 1.1 amps or minus 1.5 amps.
*
4.4.5.9 Barrel heater resistance test. With the barrel heater switches
in the OFF position, the two barrel heater thermoswitches in Barrel Number 1
shall be cooled with C02 to close the contacts. The resistance between
terminals 3 and 4 of TB101 in the barrel control box shall be 11.4 plus or
minus 0.8 ohms. Repeat this test on Barrels Number 2 and 3.
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4.4.5.10 Heater circuits operating current. For the purpose of this test
the 125 volts dc power supply of 4.4.4.25 shall be applied to terminals 5 and
11 of TB2 (Mod 5) or terminals 10 and 13 of TB102 (Mod 7). The training
gear and barrel heater switches in the junction box shall be set to the ON
position and the thermoswitches in each barrel and in the training gear shall
be cooled with C02 to close the contacts. With 115 plus or minus 0.5 volts
ac applied to terminals 1 and 2 of TB103 and an ammeter installed in the
input circuit, the current in the circuit shall not exceed 50.5 amperes.
4.4.5.11 Squib fire switch. With the control box latch plates in the
locked position, continuity shall exist across terminals 8 and 9 of TB101
and no continuity shall exist across terminals 7 and 8 and terminals 7 and
9 of TB101 in the control box of each barrel, Release the latch on the con-
trol box, observing that the switch plunger moves out forcefully, and verify
that continuity exists across terminals 7 and 8 of TB101 in each barrel and
that no continuity exists across terminals 8 and 9, and 7 and 9 of TB101.
4.4.5.12 Interlock switch. The torpedo tube assembly shall be trained
through an arc of 180 degrees from the zero degree relative position. Con-
tinuity of the switch circuit shall be measured throughout this operation
and the angles of open and closed circuit recorded. The switch shall be
open at angles of O degrees to 35 degrees plus or minus 2.5 degrees and 145
plus or minus 2.5 degrees to 180 degrees; it shall close at angles of 35 plus
or minus 2.5 degrees through 145 plus or minus 2.5 degrees.
4.4.5.13 Training crank test. With the base of the torpedo tube assembly
level, a pull scale shall be attached to the training crank handle and pulled
with a steady motion tangential to the arc of crank travel. The force re-
quired to initiate movement of the training gear shall not exceed 30 pounds
4.4.5.14 Retractable stop. With retractable stop in the operating posi-
tion, attempt to rotate the torpedo tube assembly through an arc of 180
degrees. The rotation shall be stopped by the retractable stop at 45 degrees
plus or minus 2.5 degrees from the zero position.
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