TM 9-1240-401-34&P
Item No.
Item To Be Inspected
Procedures
12
GUNNER'S AID COUNTER
Rotate gunner's aid knob (11) to stop in both directions.
Gunner's aid counters (12) must have an excursion of 50 roils
in each direction before contacting stops at extremes.
13
Rotate reset counter knob (8) while observing reset counter (13).
RESET COUNTER
Reset counter (13) must be able to reset to 3200 roils from any
counter position.
Rotate azimuth knob (10) while observing reset counter (13).
Reset counter (13) shall follow azimuth counter (15) within 0.25 mil
when azimuth knob (10) is rotated.
Set -50 roils on gunner's aid counter (12) (right) and check
that reset counter (13) reading increases by 50 0.5 roils. Set
+50 roils on gunner's aid counter (12) (left) and check that
reset counter reading decreases by 50 0.5 roils and that
azimuth counter (15) reading does not change.
Inspect lens (14) for dirt, fungus, or condensation which may
14
LENS
obstruct view through eyepiece; must be clean and
moisture free.
Rotate azimuth knob (10) clockwise, then counterclockwise
AZIMUTH COUNTER
15
while observing azimuth counter (15). Azimuth counter (15)
indication must increase when azimuth knob (10) is rotated
clockwise and decrease when azimuth knob (10) is rotated
counterclockwise.
Rotate azimuth knob (10), gunner's aid knob (11), and reset counter
knob (8) to lowest digit, with the lowest digit coinciding with its
respective index line. Check that remaining numbers are
in alinement within 1/16 inch (0.16 mm).
Inspect counter LEDs (16) by observing counter numerals;
COUNTER LEDS
16
numerals shall be clearly distinguishable in darkened area with
24 volts DC applied.
