PS Magazine - TB 43-PS-629
PS, The Preventative Maintenance Monthly
ISSUE 629
APRIL 2005
PS 629
APR 05
10
Don’t Forget the Desiccant
Both the tritium- and electronic-powered MRS use desiccant to absorb excess
moisture. Replace that desiccant semiannually, or more often in high humidity areas.
Here’s how:
1.
Wear the latex gloves that
come with the desiccant kit, NSN
1240-01-424-4628, to protect
yourself against potential leaks
from a tritium-powered MRS.
2.
Use a 3/8-in socket-head screw
key to remove both pipe screws
on the barrel of the MRS.
3.
Remove the old O-rings.
4.
Unwrap a new desiccant, NSN
6850-01-081-4193, and use it to
push the old desiccant out of the
barrel hole.
5.
Install two new O-rings, NSN
5331-00-724-7902, onto the pipe
screws. Torque the screws
between 240-250 lb-in.
M1-Series Tanks…
W
hen was the last time you checked the tritium-powered muzzle reference sensor
(MRS) on that tank, mechanic?
If you didn’t do it during the last semiannual
PMCS, it’s been too long. Here’s what to do:
Look through the inspection window. You should
see a blue light. If not, the tritium power cell could be
damaged and may be leaking inside the MRS. Double-
wrap the MRS in plastic and notify your support.
Take a closer look at the inspection window on top
of the MRS. If the window is loose or cracked, or if
condensation has formed on the underside of the win-
dow, the MRS could be leaking tritium gas. Double-
wrap the MRS in plastic and notify your support.
Tritium MRS,
NSN 1240-01-
324-2217
275-0077
409-0784
380-3125
276-6628
313-8932
444-6558
356-5887
Tank
M1/IPM1
M1A1
M1A2 SEP
475-0278
475-0276
475-0275
Battery, EMRS
NSN 1240-01-
A tritium-
powered MRS is
non-
repairable,
so replace a
damaged one
with a new
battery-powered
e
lectronic MRS
(EMRS).
Here’s
what to
order…
if the MRS
was
tritium-
powered, double-bag the
latex gloves, old desiccant,
and O-rings in plastic…
…and turn the package
in for disposal as
radioactive waste.
Look for blue light through
inspection window
If inspection
window is loose
or cracked…
…double-wrap MRS in plastic
and notify support
Remove pipe screws from
both sides of MRS
Put new packing on
each pipe screw
I wish they’d
check my muzzle
reference
sensor!
yeah, it’s amazing
how much difference
a semiannual
pmcs makes!
629.10-11(C)
2/21/05
4:27 PM
Page 1
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