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Section IV. CLEANING, INSPECTION, AND REPAIR
Up
TM-11-5840-270-24-1 Indicator lD-48A/ARN Manual
Next
Pointer Deflection Test
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

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