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(f) Alternately open and close self-sealing screw
holes so one hole is open and other is closed every 15 min-
utes.
(g) Purge until humidity indicator is blue. During
purge, lubricate self-sealing screw preformed packing light-
ly with silicone compound.
(h) Close pressure regulator (CCW) and reinstall
two self-sealing screws.
(i) Remove desiccant cap and insert new desiccant
from sealed package immediately into desiccant container.
(j) Lubricate preformed packing on desiccant cap
lightly with grease or silicone compound and reinstall cap.
Torque cap to 20 to 30 lb in. (2 to 3 Nm).
(k) Slowly open regulator valve (CW) and charge
lower section for 10 seconds to value given in ambient air
temperature chart in para 3-10.q.
(l) Close nitrogen tank valve. Remove hose and
valve extension and install dust cap.
r. Periscope, M981 Tank (fig. 3-35). Refer to
para 3-10.q.. for procedures.
3-11. Quadrants.
a. Quadrant, M14 (fig. 3-36).
Figure 3-36 M14 and M14A1 Quadrants
(1) Perform purging and charging procedure para
2-5.b.
(2) Purge instrument at 5 psig for 5 minutes.
(3) Charge instrument at 1 psig for 10 seconds.
(4) Leak test for minimum of 5 minutes.
TM 750-116
c. Quadrant, M15 (figs. 3-37 and 3-38).
NOTE
For old configuration units, refer to figure 3-37.
New configuration units are illustrated in figure
3-38.
Figure 3-37 M15 Quadrant - Old Configuration
(1) Perform purging procedure para 2-5.d.
(2) Purge instrument at 5 psig for 5 minutes.
Figure 3-38 M15 Quadrant - New Configuration
b. Quadrant, M14A1 (fig. 3-36). Refer to para
3-11.a. for procedures.
3-17
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