PS Magazine - OCTOBER 1983
PS, The Preventative Maintenance Monthly
ISSUE 371
OCTOBER 1983
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This lets moisture crystals around
the seals meLt and avoids cutting or
scarring the seals. Be sure you
follow all the starting info in the
operator's manual.
When the Huey engine is shut
down in Figid temperatures, pilots
should
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leave the linear actuators in
the ²ull increase position. This
prevents stripping of internaL gears
when attempting to extend cold-
soaked actuators during the next
³
Full increase whEn
eng±nE ±s Shut down
start up. Then, once ´he engine has
made.
K²²p '²m WARm
Even tho the nickelµcadmium cells will then have to be repLaced.
battery performs welL in cOLd
weather¶it'll start the engine beLow
·30 °c¸you should keep it warm.
¹eadµacid batteries should also be
kept warm because they can lose up
to 50 percenº of their charge in coLd
weather.
Keep the batteries warm by
removing them »rom the aircraft or
ground support equipMent and puºµ
... store ±N a
warM Place!
ting ºhem in a shelºer. Never sºore
Lead¼acid and nIckeL¼cadmiuM bat-
teries in the same she
l
ºer, tho.
½umes fRoM the Leadµacid baºte¾y
will cause ºoºal dIscharge of the
nIckelµcadmium battery, whose
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PLace ºhe baºteries on a sheLf or
dunnage¸never on the bare ¿oor.
Àhis wiLl gIve you a More equaLized
baººery teMperature.
Áf it's not possible to remove ºÂe
batºery froM the aircrafº, Ãurn on
ºhe landing light, search LIghº or
other equipment for Ä0 seconds
TUrn ³eM oN 30 seconds
prior to an engÅne start. Æhe "loadÇ
will warM up the battery inÈernally.
A warm battery will give you good
cranking power and a good spark to
head off the possibility of a hot
engine start.
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ÉeMember, also, you can assist
the aircrafÊ battery by using an aux-
iliary power unit to crank up the
bird.
Cold weather also affects the air-
craft fire extinguisher.
Áf the
temperature is below ·40 °½, the
pressure decreases and the ex-
tinguisher won't work rightË
Protect your aircraft fRom ºhe
severe weather. Covers¶canopy,
air»rame, engine, rotor blade, pIºoº
tube .
.. use all of Ìem!
´²RvµC² W¶·H A ´mµL²
½uel contamination is always a
possibility in cold weather. Áf the
aircraft is
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warm when parked, with
partially empty tanks, coLd over-
night temperatures will condense
moisture in the tanks to water
which will FeeZe.
So, always keep the ²uel tanks
topped off. Be sure you sample the
Îel on the PÏ Daily. Drain off
enough fuel so that it's clean and
bright¶free of water.
The oil you add to the engineÐ
transmission and gear boxes should
be the type called for in the servic-
ing chart of
each aircraft
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maintenance Manual. Also, checÑ
out TB 5Òµ15Óµ2Óµ24 on use of ºhe
right airÔraft fuel and oil
½or exaMple, if you're crewing a
UHÕ1 and the temperature is colder
than
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25 °½, you should be usIng
ÏÁ¹µ¹µ7808 oil. Above that
temperature, use ÏÁ¹µ¹µ23699 oiL.
The viscosity (flow rate) of »ire-
resi s tan t
hydraulic
fluid,
ÏÁ¹µÖµ83282× aLso decreases In
very cold weather.
The change FoM ÏÁ¹ØHµ83Ù8Ù
to ÏÁ¹µHµ5606 in low temperatures
is spelled out on Page 4µ1 of TB
55µ15Óµ334µ25× on conversion ºO
the »ireµresistant red juice. CHµ5ÚÛ
choppers in Alaska are authorIZed
to use onLy ÏÁ¹µHµ5606 at any
temperature. CHµ54 aircraft in aLL
other
areas
shouLd
use
ÏÁ¹µHµ83282.
Yessirµeµeµe, keeping your air-
craft in the cold blue yonder means
using a LittLe savvy. Éead aLl abouº Iº
in ÆC 1µ12 and ½Ï 31µ71.
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