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c. Telescope Mount, M149/M149E1
NOTE
(fig. 3-15).
Mount must be removed from installed position
for purging and charging operations. Refer to ap-
pendix A for a listing of applicable publications.
Figure 3-15 M149/M149E1 Telescope Mount
(1) Remove inlet port cap and outlet screw on M149
Telescope Mount. Do not remove poppet valve on M149E1
Telescope Mount.
(2) Perform purging and charging procedure para
2-5.b for M149 and para 2-5.a for M149A1.
(3) Purge M149 Telescope Mount at 5 psig and
M149E1 Telescope Mount at 3 psig. Maintain pressure for
10 minutes.
(4) Charge instrument at 1 psig for 40 seconds.
(5) Leak test for a minimum of 5 minutes.
TM 750-116
d. Telescope, Mount, M187 (fig. 3-16).
HANDLE WITH CARE. IN THE EVENT
THE RADIOLUMINOUS SOURCE IS
BROKEN, CRACKED, OR SUDDENLY
LOSES ILLUMINATION, DO NOT AT-
TEMPT TO REPAIR. IMMEDIATELY
DOUBLE WRAP INSTRUMENT IN PLAS-
TIC AND NOTIFY THE LOCAL RADI-
ATION PROTECTION OFFICER (RPO).
(1)
2-5.a.
(2)
(3)
(4)
(5)
Figure 3-16 M187 Telescope Mount
Perform purging and charging procedure para
Relief valve should open between 3-10 psig.
Purge instrument for 5 minutes.
Relief valve should close between 1-5 psig.
Leak test for minimum of 5 minutes.
3-7
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