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|  MIL-G-19027D(OS)
3.3.1.3 Caging current. The current required by the caging mechanism
during the caging operation shall be 3.4 plus or minus 1.1 amperes, and
this current shall drop to 1.4 plus or minus 0.3 amperes while maintain-
ing the gimbals in their caged position.
3.3.1.4 Uncaging the gyro shall be accomplished electrically by re-
moval of the caging voltage described in 3.3.1.1.
3.3.1.5 With the steering gyro stopped or running, the caging mecha-
nism must cage the gyro in 40 seconds maximum time.
3.3.1.6 The steering gyro shall not become uncaged due to acceleration
of 20 gravity units (g) in any direction.
3.3.1.7 The steering gyro must operate caged, with the motor running,
for a minimum of one hour.
3.3.1.8 When caged and with the gyro motor running, the steering gyro
must remain caged when rotated at all speeds up to two revolutions per
minute (rpm).
3.3.1.9 When rotating at speeds up to one rpm, the steering gyro shall
uncage within 100 milliseconds (ins) after removal of the caging voltage.
3.3.1.10 The gyro gimbal shall not shift more than 1/10 degree when re-
leased from the caged to the uncaged position.
3.3.2 Pickoff. The pickoff shall be electrically equivalent to U.S.
Navy Synchro Transmitter Mk 22, conforming to the requirements of MIL-S-
16892.
3.3.2.1 Zeroing. The synchro shall be so mounted on the gyro assembly
that the synchro is electrically zeroed, as described in 4.5.3.6, when
the gimbals are in the caged position.
3.3.3 Balance. The gyro shall be balanced and adjusted for operation
at zero degrees latitude. Compensation for operation at other latitudes
(creep) shall not be incorporated in the gyro assembly.
3.3.3.1 Precession. The allowable precession (drift minus creep due
to the earth's rotation), when tested on a roll pitch, and yaw table ad-
justed to 10 degrees tilt, with the table set for automatic reversing,
shall not exceed 0.1 degree per minute average for a 5-minute period,
when tested as in 4.5.3.7.
3.3.3.2 Static precession. The allowable static precession (exclusive
of creep due to the earth's rotation) shall not exceed 0.15 degree per
minute average for a 10-minute period, when tested as in 4.5.3.8.
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