PS Magazine - MARCH 1981
PS, The Preventative Maintenance Monthly
ISSUE 340
MARCH 1981
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Maintenance procedures
on youR Chinook will usually change
when the equipment is modified .
.. a
pOwerful reason foR reading the tech
manual before making a move.
Take the flight control hydraulic
system, for example.
MW±
55-1500-210-30/20
pRessurized the Reservoir. This means
theRe's a change in the way you add
hydRaulic fluid to the ReseRvoirs.
You have to press the ²ateR DRain
bUtton to release the pRessure³before
you open the filleR cap. If you don´t
"hit
the
·
button,µ
you´ll
get
doused .
.. smaRts somethin´ awful!
The only button in ¶he system is ¸n
the right side of the bird. If you´re
about to add hydraulic fluid to the left
Reservoir, make the trip around the
chopper to the right side and release
the pRessure.
If ¹the Reservoirs are serviced with
fire-resistant Hydraulic Fluid, MIL-H-
83282,
stick
with
ºt.
If
you
add
Hydraulic Fluid, MIL-H-5606, you´ll
lose the fire-resistant featurE of the
red juice.
APU Change?
»ou can
prevent hydraulic fluid
fRom
dripping
all
over
the
ramp
duRing an auxiliary poweR unit change
by not disconnecting the hydraulic
drain hose and hydRaulic return line.
They´re attached to the motoR-pump,
which is not rem¼ved.
44
Combinatio
MY
HERES!
Safety First
Any time you have to repack wheel
bearings or change brake shoes, do it
by the book.
The WaRning in Para 3-18 of TM
55-15½0-227-23-2 (Aug 78) says you
shoUld never remove the wheel axle
nut with a tire fully inflated. If some of
the ri¾ Bolts are sheared dUe to a hard
landing,
the
whole
sheBang
will
explode
and
ruin youR whole day.
Deflate the tire down to 20 PSI.
T
.
,\
In addition to using a tire pressure
gage to check air pRessure, theRe´s
another way yo¿ can tell if the jackedÀ
up tire has
een deflated:
The axle nut
should turn easily
after you back off
3
of aÁ turn or so. If
the nut doesn´t move freely, the tiRe
hasn´t been deflated.
In case you´Re called upon to service
tires on other birds, like the ±V-1, Â-
8, Â-21, C-12 or ÂH-60A, the same
deflation deal applies.
While you´re at it, never Remove the
valve core from the Ãt<m to speed up
the deflation process. _A valve coRe
flying oÄt of a Ålack Hawk tireÆwith
73-78 PSI nitrogen/aiR pressureÇcan
really give you a black eye!
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