Gyrocompass. - TM-55-1915-200-100748

TM 55-1915-200-10

NOTE

The compass card will move away

The Emergency Generator Engine

from heading rapidly if a longer

control switch (15) has four settings:

period than that indicated in the

RESET,

STOP,

MANUAL,

and

following stop is allowed between

AUTOMATIC. The STOP position will

starting and uncaging. If possible,

immediately stop the Emergency

uncage when the ship is at the center

Generator Engine. However, it is

of pitch or roll so the gyro will be

preferable to use the RESET since

released near a level position.

this

prepares

the

Emergency

Generator Engine for restart.

d. Position the MODE SELECTOR switch (7) to

NOTE

START Wait 30 to 35 seconds, then depress cager

Should a power failure occur

control on top of the binnacle and note that the CAGED

immediately after an electrical load is

lamp (15) extinguishes.

applied

the

ship

service

generators, the emergency generator

e. Note if pointer on the Level Meter (3) swings

can be started from the MANUAL

equally about zero. If it does, proceed to the next step.

If it does not, operate the TILT/ AZIMUTH switch (9) in

position, if the Engine Control

the direction of the required tilt correction until equal

Switch (15) has not been placed in

travel about the zero point is obtained.

the AUTOMATIC position.

f. Observe the compass card for about one minute

2-7.2. Gyrocompass.

to determine the direction of card movement with

respect to the required course.

2-7.2.1. Heavy Sea Starting.

(1) If the card is moving toward heading,

a. Position RPTR switch (12, FIGURE 2-221) to

allow it to continue until it is within 2 degrees of the

OFF (down) and MODE SELECTOR switch (7) to

desired heading, then operate the TILT/AZIMUTH switch

SLEW.

(9) to level the gyro and make the average position of

the Level Meter (3) pointer zero.

(2) If the card is moving away from heading,

NOTE

reverse polarity of the average pointer position by

The compass will slew rapidly if the

operating the TILT/AZIMUTH switch (9). Wait until the

gyro is caged.

direction of the card movement changes and, when it is

within 2 degrees of the desired heading, operate the

TILT/AZIMUTH switch to level the gyro and make the

b. Note that the CAGED lamp (15) is lighted. If it

average position of the Level Meter (3) pointer zero.

is not, depress the caging control (1) on top of the

binnacle to cage the gyro and wait 5 minutes for the

ballistic fluid to stabilize.

g. Position MODE SELECTOR switch (7) to RUN.

c. Use the TILT/AZIMUTH switch (9) to rotate the

h. Position N-S switch (14) to N (north) or S (south)

compass card to the approximate ship's course. In the

as required.

(+) position the card rotates counterclockwise, in the (-)

position the card rotates clockwise.

Change 11 2-580.2