PS Magazine - TB 43-PS-740

PS, The Preventative Maintenance Monthly

ISSUE 740

JULY 2014
PS Magazine - TB 43-PS-740 - Page 25 of 33
46
PS 740
JUL 14
Pay particular attention to the work
packages and paragraphs about the
image intensifer tube that cover the:
F
ield maintenance technicians, if you work on AN/PVS-14 monocular night vision devices
(NVDs), AN/AVS-6 aviator’s night vision imaging systems or AN/PVS-7 night vision goggles,
listen carefully.
When you inspect and test the image intensifier tube, some of you are reaching the
wrong conclusion about the condition of the tube. In other words, you’re finding problems
that don’t exist and then turning in a perfectly good tube for disposal.
For example, the size and location of black spots often mislead
technicians into thinking a tube is damaged. Actually, black
spots are OK if they pass the black spot check in your TM.
In some cases, NVDs or tubes still under warranty are
being turned in for disposal. All these unneeded turn-ins
are expensive. The average cost of an NVD image
intensifier tube is $2,500.
•
warranty.
•
6-month service.
•
preventive maintenance
checks and services.
•
inspection criteria for
the image intensifier
tube.
•
testing of the image
intensifier tube with
the TS-3895/UV or the
TS-3895A/UV test set.
•
testing of the image intensifier tube with the TS-4348/UV test set.
AN/AVS-6(V)3 aviator’s night vision imaging system (ANVIS)
AN/PVS-14 monocular night vision device (MNVD)
AN/PVS-7B, -7D night vision goggles (NVG)
TM 11-5855-313-23&P
TM 11-5855-306-23&P
TM 11-5855-262-23&P-2
Night Vision Device
TM
Night Vision Devices…
it’s A
About
image
so the next time you
inspect
and
test
the nvd’s image intensifier
tube,
do it by the book.
here are the
tms you’ll
need…
•
black spot check using
the black spot target,
TM 11-5855-262-23&P-2
Black spots are cosmetic blemishes and do not affect reliability. Generally, you can assume that the
black spot was there during acceptance testing. However, occasionally the need may arise to verify
the location, size and number of spots. This test allows the maintainer to evaluate possible out-of-
specifcation black spots, dark spots, or opaque spots in the image area against the specifi cations for
the image intensifi er.
Test Facility
Dark room
Tools
Measuring tape, (Appendix B, Item 13)
3-volt incandescent fl ashlight or smaller, (Appendix B, Item 11)
3-11 BLACK SPOT CHECK
INITIAL SETUP
Your TMs tell you how to
perform a black spot check
Okay… that one
looks clearer
than the last
one…
okay, this
one’s more
fuzzy.
Do you still
see any Black
SpOts?
no…
not
now.
Hey.
..
waitaminit! Do
you by chance
work a lot
with an NVD?
Yeah!
Howja
know
that?
I think I know
what your
problem is!
Prevent lens damage by using lens caps
in storage and during shipping.
740 46-47.indd
1-2
5/22/14
3:39 PM
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