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| TM 11-5820-554-12
ALL EMPTY
MARKED POUCHES
ARE FOR CRYSTALS
IN EQUIPMENT
EMPTY UNMARKED
POUCHES FOR
SPARE CRYSTALS
ELOD0008
F
Figure 4-2. Crystal packet, unfolded
4-4. Organizational Preventive Maintenance Checks and Services Chart for Crystal Unit
Set, Quartz CK-31/FRC-93
W-Weekly
M-Monthly
Q-Quarterly
Item
Interval
No.
Item to be inspected
Procedures
W
M
Q
Crystals
Check crystals not in use with crystal test set to
insure correct operation
Change 6 4-2
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