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TM 9-1240-375-34&P
0073 00
3.
Set fire control quadrant (1) to zero and place on inspection aid support assembly (2). Turn elevation
handwheel (3) clockwise until level bubble (4) in fire control quadrant centers.
6
5
0 .2 5 M IL
0 .2 5 M IL
1 .5 0
1 M IL
1 .5 0
1 M IL
N O T E : M il s iz e = T a r g e t d is ta n c e (in c h e s )
1000
1 fc 4 4 7
4.
Use any suitable material to locally fabricate targets (5 and 6).
NOTE
Target and plumbline should be positioned at a minimum of 40 feet (12.2 m) from
cross-leveling fixture and aligned to M137A2/M137A3 telescope set at 4800 mils.
The line of sight of the M137A2/M137A3 telescope will be across the elevation
vernier scale of cross-leveling fixture.
7
9
8
1 fc 4 4 8
5.
Secure M137A2/M137A3 telescope (7) to optical instrument support (8).
6.
Ensure cross-leveling fixture and M171/M171A1 mount are cross leveled.
7.
Turn azimuth knob (9) clockwise to 4800 mils. Align plumbline and target to the M137A2/M137A3
telescope reticle.
0073 00-19

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