PS Magazine - TB 43-PS-680
PS, The Preventative Maintenance Monthly
ISSUE 680
JULY 2009
26
PS 680
27
PS 680
JUL 09
Repairmen, when M2s come back from the Feld you should check the barrel
extension side rails for cracks, particularly in the forward corners. Use a magnifying
glass, NSN 6650-00-133-7743. If you detect or even suspect cracks, send the M2 to
the next level of maintenance. They can use the dye penetrant kit, NSN 6850-00-826-
0981, to make a thorough inspection of the barrel extension.
1.
The area to be inspected must be free of all
substances like oil and solid Flm lubricant. Spray
a small amount of the kit’s cleaner/remover on the
area and allow the cleaner/remover to dry. Wipe off
the area with a clean cloth.
2.
Spray on only enough penetrant to wet the area.
Let the penetrant set for 10 minutes, but no longer.
You don’t want the penetrant to dry.
3.
Wipe off the penetrant with a dry, clean cloth.
If some of the penetrant has dried, spray cleaner/
remover on a clean cloth and wipe off the dried
penetrant. Don’t flush the surface with cleaner/
remover–that spoils the test.
4.
Shake the developer can well and spray a thin,
even coat of developer over the area being inspected.
Give the developer a few minutes to work. Any
cracks will show up as a change in color. Cracks make
the M2 unserviceable and it should be turned in.
5.
If there are no cracks, spray cleaner/remover on
the area. Let it dry and wipe off the area with a clean
cloth. Then apply solid Flm lubricant.
GETTYSBURG
here are the
instructions for
using the kit…
see
tacom
maintenance advisory
09-01
7
for more info.
Repairmen, use magnifying glass to check for cracks
Inspect for cracks on rails, wrapping
to inside of barrel extension
Inspect for cracks at
rear of breech lock slot
Top view
THE EVE OF
BATTLE
in july 1863, union
and confederate
armies clashed at
gettysburg, pa.
volumes of books
cover the facts
of the three-day
battle.
little has been
written about the
eve of the battle
for the two units
that would fire
the first shots.
this is
their
tale…
680.26-27.indd
1-2
6/2/09
6:03:50 PM
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