PS Magazine - TB 43-PS-692

PS, The Preventative Maintenance Monthly

ISSUE 692

JULY 2010
PS Magazine - TB 43-PS-692 - Page 22 of 33
40
PS 692
JUL 10
41
PS 692
JUL 10
T
o get the sharpest image on AN/PVS-7B, or -7D night vision goggles, the objective
lens is factory-set at inFnity. This setting is held by the objective lens assembly
locking ring.
During some maintenance, the locking ring is released, the objective lens is
refocused and the locking ring is set and sealed again.
So far, so good.
Unfortunately, users, some of you aren’t happy with the sharpest focus you can
get. You’re sure you can do a little better. So, you break the seal on the locking ring
and start twisting the inFnity focus. Soon, you’ve screwed the objective lens so tight
against the image intensiFer tube that you crack the lens at worst or reduce goggle
performance at best. Neither of these is a good thing!
Users,
your job concerning the locking ring is to make sure it isn’t loose or cracked
like it says in TM 11-5855-262-10-2. It is not your job to loosen it. If the ring is loose
or cracked, turn it in to your NVG maintainer for repairs.
Maintainers,
your job is to reset the inFnity focus and lock the ring in place. To
ensure the locking ring stays in place, it is sealed with drops of sealing compound,
Do not seal it with super glue or
any other kind of glue!
Doing this will
not allow future adjustments. Then the
entire objective lens must be replaced.
Most of you are saying you would never
use glue. Good. But some of you are
saying “oops,” because you’ve done it!
Just say
“No!”
to glue!
When the locking ring needs to be
loosened, do it with cushioned slip-joint
pliers, NSN 5120-00-624-8065. This is
all part of the instructions in Para 3-13
of TM 11-5855-262-23&P-2.
Dear Half-Mast,
I’ve got one of those “what the heck
is happening” questions concerning the
battery compartment on the AN/PVS-
14 night vision device (NVD).
I was told to order the single
battery compartment, NSN 5855-01-
523-4058, for our NVDs. It’s newer
and supposedly more durable than
the dual battery compartment, NSN
5855-01-444-1233. In addition, as
indicated, it needs only one battery!
Both of these battery compartments
are shown in several illustrations
including the cover of TM 11-5855-
306-10.
However, when I order the single
compartment, they send the dual one!
Now I see that the single compartment
is a terminal item on FED LOG!
So, what the heck is happening with
the single battery compartment for the
AN/PVS-14?
SSG S.W.
Dear Sergeant S.W.,
Thanks for writing. At PS, we
love answering “what the heck
is happening” questions.
What
the heck is happening is a supply
SNAFU.
Somewhere, somehow,
the ball passing between the
supplier of the single compartment
and the Army supply shelves was
dropped!
Now it looks like 2011
before the single compartments
will be available.
So, continue to live with the dual
compartment and the two batteries
for now and when the single one
becomes available, we’ll let you
and all PS readers know.
AN/PVS-7B, -7D…
let’s
Focus
on the
Locking
Ring!
AN/PVS-14 NVD…
S
ingle
O
ut
B
attery
C
ompartment
Infnity
Focus
lock ring
Sealing
compound
Objective
lens
there! I just
ordered you
a new
single
battery
compartment!
great!
your
dual
battery
compartment
as ordered!
what the
heck just
happened?!
very soon (cause
that’s how things
move in the army!)
692.40-41.indd
1-2
6/1/10
5:39:32 PM
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