Section VI. TEST PROCEDURES

TM 11-5840-270-24-1

Section V. BALANCE TEST PROCEDURE

b. Observe the two pointers, they must be aligned

4-17. Scope

with the two rows of dots. If not, adjust the

This section describes the balance test procedure

movement mechanisms so each pointer is aligned

for the meter movement mechanisms. Mechanism

over its corresponding row of dots.

moving elements must be well balanced about their

c. Rotate the indicator clockwise 90 from

axis of rotation in order to provide accurate in-

vertical and observe the pointers. They must still be

dication while in normal operating position as well

aligned over the rows of dots.

as when tilted, as may occur in service. Adjustable

d. Rotate the indicator to 90 counterclockwise

balance weights are provided on pointer tail and

from vertical and observe the pointers. They must

arms for balancing purposes during fabrication.

still be aligned over the rows of dots.

4-18. Procedure

a. Place indicator in horizontal position, as

normally occupied in panel of aircraft.

Section VI. TEST PROCEDURES

Control

identification

Setting

4-19. Preliminary Procedures

R2 control . . . . . . . . . . . . . . . .Maximum counter-

a. General. Connect the indicator to the In-

clockwise

dicator ID-48A/ARN Test Panel, using the

S1 rotary switch . . . . . . . . . . . . . . . . . . . . . H position

branched cable supplied with the test panel. Place

S7 2-position

switch . . . . . . . . .. . . . . . . . . . . . . . . . . . A position

all controls on the test panel as indicated in the

S8 flag override

following paragraph. Then connect the test panel to

switch . . . . . . . . . . . . . . . . . OFF position

115 vac 60 Hz power, place the POWER switch in

the ON position and observe that the lamp beside

NOTE

the switch is lighted.

Other switches on panel are spring return

b. Test Panel Controls (fig. 4-6).

to off position.

Control identification

Setting

c. Indicator. Place the indicator on a solid

POWER/ON

support or table, positioned in the normal operating

switch ............................................. Down in off position

position.

R1 control ............................................. Maximum counter-

clockwise

4-7