SECTION II. OPERATION - TM-55-4920-415-13-P0009

TM 55-4920-415-13&P

SECTION II. OPERATION

If one 360 degree loop in dive or climb is

2-13. General. The instructions contained in this section

desired, leave fork index knob engaged. If

are for the use of the operating personnel.

continuous loops in dive or climb are desired,

pull out and rotate knob one-fourth turn.

2-14. Set-Up.

c. Positioning of indicator under test axially within

a. The gyro tester should be located on top of a test

the gimbal ring may be accomplished by first

bench with sufficient table space for the tester and

loosening lock screw (30, Figure 1-1) rotating

other equipment. The power cable (18, Figure 1-1)

the mounting plate (5), and finally re-tightening

is connected to a 115 volt, ac, 60 Hz power source.

the lock screw.

CAUTION

d. Set the rotational rate switch (26) to the value

Set the vibrator and rotation toggle

called for by the Technical Manual of the unit

switches (22 and 25) and turn the

under test.

rotational rate switch (26) to the "OFF"

e. Set the vibrator motor switch (25) to the "ON"

positions prior to applying power to the

position if called for by the Technical Manual.

gyro tester. This will prevent any wires

f. The gyro tester is put into operation by setting

that may be leading from the gyro

the rotation switch (22) to the "ON" or

transmitters under test from becoming

"REVERSE" position as required.

unnecessarily wrapped up.

b. As a first step in leveling the gyro tester, set the

2-16. Rates of Roll Simulation.

fork in the horizontal position shown. Engage the

a. Position the plane of the gimbal ring (6, Figure

fork index knob (14) and proceed to level the base

1-1) perpendicular to the plane of the fork (7) by

using four leveling pads (3) while observing circular

pulling out the gimbal index knob (1).

level (9).

b. Steps in the operation are the same as 2-15. (b)

c. Pull out the gimbal index knob (1) and rotate the

through (f).

gimbal ring (6) so that its plane is parallel to the

plane of the fork as shown. Release the knob and

secure the gimbal ring. Pull out the cradle index

2-17. Rates of Turn Simulation.

knob and rotate the cradle (15) so that it is in the

a. Position the plane of the gimbal ring (6, Figure

vertical plane. Release the knob and secure the

1-1) perpendicular to the plane of the fork (7) by

cradle. Proceed to level the tester by using the

pulling out the gimbal index knob (1).

leveling pads (3) and observing the circular level

(4).

b. Rotate the cradle (15) to the vertical position by

pulling out the cradle index knob (17).

d. Mount the indicator to be tested on the adapter

NOTE

plate (2). Instruments under 6 inches in diameter

can be accommodated by the mounting plate (5).

Exercise care to re-engage the index

2-15. Rates of Dive and Climb Simulation.

knob before turning loose of the cradle.

a. Pull out cradle index knob (17, Figure 1-1) and

Dropping the fork assembly onto the

rotate cradle (15) to horizontal position shown in

base could cause misalignment of the

Figure 1-1. Secure cradle by releasing knob.

tester.

b. Rotate fork (7) to 0 degree position by pulling out

fork index knob (14). Secure fork by releasing

c. Additional steps in the operation are the same

knob.

as 2-15. (b) through (f).

SECTION III. OPERATION UNDER UNUSUAL CONDITIONS

2-18.

Humid Conditions.

Inspect all electrical

2-20. Salt Water Conditions. Immediately wipe off the

components for signs of corrosion. Use a fine sandpaper

unit with a cloth dampened with fresh water if it comes

to remove corrosion from the terminals of components,

into contact with salt spray. Dry thoroughly.

particularly, the fuse holders and lamp holders.

2-19. Dusty Conditions . It is important to keep dust off

the unit. Cover the gyro tester when not in use.

2-2