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TM 750-116
f. Rate Tachometer (fig. 3-9). Refer to para 3-5.a.
for procedures.
Figure 3-9 Rate Tachometer
3-6. DEVICE, ALINEMENT, M139/M140,
(fig. 3-10).
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).
Figure 3-10 M139/M140 Alinement Device
a. Perform purging and charging procedure para
2-5.b.
b.
Purge instrument at 7 psig for 5 minutes.
c.
Charge instrument at 1 psig maintaining pressure
for 10 seconds.
d. Leak test for minimum of 5 minutes.
3-7. DEVICES, BORESIGHT.
a. M26/M27 Boresight (fig. 3-11).
Figure 3-11 M26/M27 Boresight Device
(1) Remove the rubber protective head cover.
3-5
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