PS Magazine - TB 43-PS-636
PS, The Preventative Maintenance Monthly
ISSUE 636
NOVEMBER 2005
There are three possible ANVIS objectives lenses:
•
PN 5002550; NSN 5855-01-149-4101
•
PN A3279595, NSN 5855-01-476-1481
•
PN A3279596, NSN 5855-01-519-4171
The number on the 5002550 objective
lens is printed inside the lens assembly on
the cell assembly, so you’ll have to open
the assembly to see it.
The PNs for the
A3279595 and A3279596 are easier to see
because they’re printed around the edge of
the cell assembly.
You’ll find it handy to write the PN of the objective lens assemblies on the his-
torical record for each ANVIS to track them.
If your cover and bird make an ice sandwich, loosen the cover edges and use heat
from a ground heater to finish off the job.
Check uncovered areas daily. Freezing rain or blowing snow can seep into and
freeze exposed moving parts. Make sure everything works and is not frozen.
Snow, sleet and ice storms can cause more trouble. After a storm, remove the
engine inlet plugs and exhaust covers and look for ice. Carefully remove any ice you
find the way your TM instructs, and thaw out the engine with hot air.
Never remove ice by scraping or chipping. Always apply heat or de-ice liquid.
PS 636
NOV 05
33
All Aircraft…
U
nlike most birds, yours don’t get to fly south for the winter. In order to keep them
going, crew chiefs have to do some tough work.
Leaving your aircraft uncovered and unprotected on the flight line can make that
job even harder. If covering the whole bird is too tough, cover at least the bare mini-
mum: engine inlets, exhausts, exposed linkages, pitot tubes, canopies and rotor heads.
Make sure that the aircraft and covers are dry before putting the covers on the air-
craft or you run the risk of them freezing on the aircraft. If the aircraft is moving from
the hanger to the flight line, cover it before it moves.
Lens Clarification
O
n Page 61 of
PS 629, we printed a
brief on ordering
aviation night vision
imaging system (ANVIS) objective
lenses.
The headshed at PEO Soldier has
provided additional clarification:
If you have to replace an ANVIS
objective lens assembly on the binocu-
lar, be sure to replace it with the same
type of objective lens assembly.
ANVIS objective lens assemblies must
be matched by PN. Don’t mix objec-
tive lens types on the same binocular.
Check your binoculars for correct lens
be patient…
your covers
will be here
soon!
ANVIS Objective
it’s…
fruh-fruh-
freezing!
I can’t
even feel
my buh-
blades!
make sure
your
binoculars have the
right
lenses!
636.32-33(C).qxd
9/30/05
9:41 AM
Page 1
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