PS Magazine - OCTOBER 1981
PS, The Preventative Maintenance Monthly
ISSUE 347
OCTOBER 1981
r
' ·
Pulling mainteNance in the Cold is a
_.'!
slow process. Move your bird inside if
i ·
possible. If you can't, use a mainte-
l
I
nance shelter or use canvAs or a
,
:
1
parachute shroud to rig a temporary
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h
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el
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t
³
er
:
.
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r
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I
i
ground heater such as
Herman-¸elson to warm and iNflate
your shelter. ¹ warmº ventilated area
wiLl allow you to work without bulky
clothing and heavy gloves.
Be careful w»en you work on cold¼
soaked birds. The cold makes plastic
and metal parts brittle and weaker.
½old gets to gaskets and sealsº too.
They expand and contract .
.. And leAk.
Torque nuts aNd bolts to the correct
¾
valueº but be careful not to overtorque.
You could twist them off.
cylinders clean. Use a rag dampened
wit» hydraulic fluid to get dirtº icE and
grit off the pistons before the seals are
damaged.
Service pressurized systems accorD¿
iNg to the instructions in each aircraft
maintenaÀce manual. Áemember thAt
any moisture present will freeze into
ice crystAls and damage seAls.
When youÂrà moving your bird
from a warm hangar out into the coldº
oÄen the doors a little so thAt the
temperature cAn equalize on both
sides of the windows. That keeps Âem
From cracking.
¹void bending rubber hoses or
rubber covered wires while theyÅre
cold soaked. Áubber gets brittle and
stiff and could crack.
Use oil and hydraulic fluid listed in
the
bird Lube chart for the
temperatures where youÅre operating.
Para 4-1 of TB 55-1500-334Æ25 gives
mÇnimum temÈeraÉures for using the
fire resistant fluid MilÆHÆ83282.
If you have t»e MilÆH-83282º Para
t
4-2 of the
T
tells you how to change
±
S.
ÊaNdiËg geAÌÍskids or ÎheelsÏ
needs attentionÐtoo. ÑyebaLl your tires
regularly. When the temperature
dropsº tire pressure drops.
TiÒes get stiffº tooº and get flat
spots. These should go awAy when the
tÇres roll.
Tires and skids can freeZe to the
ground. If they doº use liquid deicer or
Ó
heatÔnot over 160°ÕÖto free Âem.
Move the bird immediately to keep it
from freeziNg down againÔmaybe
even tighter!
time. ×ake the turns wide and easy.
Give yourself plenty of stoppiNg
room. Use chains on your tugº if youØve
got themº but Keep it sloÙ.
Ú
Ñxcessive braking can result in
Ski
d
s can freeze
frozen-up braKes for real! If the
to th
e
g
rO
u
n
d
wheels roll thru snow while the brakes
Ûse boardsº evergreen boughs or
something similar under tires to keep
them off snow or ice.
are still hotº the snowÂll melt and
GroundÜhandling wheels on your
r"-±.;²³´µ:¶·_¸=¹º»¼½'¾
¿ÀÁ
HO
t
brakEs
+
snOw banks
=
frOzen brakes
refreeze around the brAkesº lockÇNg
them up.Use a heAter to thaw out and
dry the brakes.
helicopter may bog down in snow
whiLe being towed. ÁeÝove the
wheels and tow your bird on its skids
like a sled.
³
to cold weather Mil-HÆ5606.
±
If your bird has a fÞelÆburniNg
²
«,³´
>ÂA
heaterº check it out by the manual.
Make sure t»e drAins and vents are
_
±
Wipe shock struts and hydraulic clearº and remove any soot buildßup.
40
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