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 TM 9-1240-375-34&P
0052 00
REMOVAL
WARNING
TRITIUM
GAS (H3)
When maintaining radioactively illuminated fire control equipment, follow radiation
hazard procedures in warning summary.
NOTE
General support maintenance instructions for the M18 quadrant cover assembly are
identical to the M17 quadrant cover assembly.
1
5
4
3
2
3
1 fc 1 7 3
1 fc 1 7 2
M17/M18 Quadrant
WARNING
To avoid injury to personnel and damage to equipment, cover assembly will only be
removed if counters are fully illuminated. Place cover assembly in secure area and
exercise caution to avoid breakage of nuclear lamps.
Remove seven machine screws (1), seven lockwashers (2), cover assembly (3), and O-ring (4) from housing
assembly (5). Discard lockwashers and O-ring.
DISASSEMBLY
CAUTION
Exercise special care when removing optical instrument windows to ensure that
tritium vials are not damaged.
0052 00-2
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