PS Magazine - TB 43-PS-741
PS, The Preventative Maintenance Monthly
ISSUE 741
AUGUST 2014
R
epairmen are replacing the AN/PVS-14 night vision device’s image intensifier tube
when the problem may be just a loose retaining ring. That’s a $1,500 fix for a ring that
just needs tightening.
When the retaining ring isn’t installed right, it can loosen. That allows the light
pipe and image intensifier to shift in the housing. The light pipe can no longer
project the IR indicator light or low battery indicator in the field of view. That makes the
AN/PVS-14 NMC.
And if the retaining ring loosens
completely,
the
image
intensifier
won’t work at all.
The following faults are indicators
of a loose retaining ring:
•
Low battery indicator
doesn’t light
•
Image intensifer doesn’t
glow green
•
IR illuminator Fails
•
IR indicator light doesn’t work
•
A noticeable rattle when the
NVD is handled
40
PS 741
AUG 14
If
the
problem
is
a
loose
retaining
ring,
remember
you
must use the retainer wrench, NSN
5120-01-170-5088, to tighten the
ring or it won’t stay tight.
The troubleshooting table in TM
11-5855-306-23&P will be revised
to add a check for a loose image
intensifier tube retaining ring.
There will also be an enhanced
maintenance
training
package
coming out for the AN/PVS-14.
Dear Half-Mast,
We are having trouble ordering the sear
assembly and feed slide assembly for our
MK 19s. Fig 2 in TM 9-1010-230-
23&P (Aug 12) lists NSN 1010-01-133-
6990 for the sear assembly and NSN
1010-01-133-6980 for the feed slide
assembly. But FED LOG shows these
NSNs as unavailable. Can you help?
MSG C.T.
Dear Master Sergeant,
Sure can. The TM lists an SMR
code of PAFFF for both items.
That’s wrong. The correct SMR
code is AFFFF, which means you
order the individual components
and assemble them at ±eld-level
maintenance. See Fig 11 for the
feed slide assembly components
and Fig 12 for the sear assembly
components. The SMR codes will
be corrected in the next revision
to the TM.
AN/PVS-14 Night Vision Device…
No image?
CheCk Retaining Ring
MK 19 Machine Gun…
I think
I’ve got
an SMR
problem!
We’ll
correct
that ASAP!
Feed slide and sear
SMR code is AFFFF
The
only
way
to verify the
retaining ring
is loose is to
disassemble
the
AN/PVS-14.
Tighten
loose
image
intensifier
tube
retaining
ring with
retainer
wrench so
ring stays
tight
Retainer wrench
I can’t see
AnyThiNg
throUgh you! Guess
we’re going to have
to replace your
image intensifier
tube. That’s a big hit
for our budget.
not so
fast!
try tightening my
image intensifier
tube retaining
ring
before
you
replace anything.
that’s
usually the
problem.
741 40-41.indd
1-2
6/30/14
5:19 PM
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