PS Magazine - MARCH 1972
PS, The Preventative Maintenance Monthly
1972 SERIES, ISSUE 232
MARCH 1972
Your HueyCobra oil cooler drain
valves leaking and ruining ±ou'r Bird²s
makeup?
Then the drain lines proviDed b± MWO
55-1520-22³-20/³1 (Aug 69) ma± have
Been installed wrong and stress has frac´
Rured a valve or Rube.
So, tr± these PM beaut± tips:
First, the drain valve, µ /N 465C62-
NSW, has a 1-in square boD± so use a
³-in wrench to ¶old it firm while loosen´
ing or tightening the ·-nu¸ above it.
¹emove Both drain RubesºP/N²s 209-
040-55³, 209-060-501ºand c»eck eac»
¼lared end ½or cracks and for proper
seating at t»e valve and at the cross, P /N
AN827-6¾.
Ins¿ect valve Bodies and
"·À
nuts for
cracks
and
stripÁed
thrEds; packings in lower tee outlets
Âr condition. ¹eplace those items w»ich
appear to be damaged.
Ãach valve Äan be adjUsted for fit b±
looseniLg jam nuts. To make adJustÅents
¼Ær the proper height of the drain line,
loosen the ·-nut on top of the valve.
Place ±our wrench above t»e drain
handle and hold firm while ±ou adjust.
Then tighten, but gentl±.
Be sure ±Çu replace the air inlet screen
with the tapered (longest siDe) ¼orward.
You can put the screen on
È
Bassackwards
but ±ou²d restrict the air Blowing t»ru
the transmission aÉd engine oil coolers.
LARGE
SIDE
FORWARD
52
engine in ±our Ca±use or
Kiowa has a maximum Êrbine outlet
temperature before normal torque is
reaÄhed ma±Be ±ou have an engine proB´
lem.
Could
b,
tho, the turbine outlet tem´
perature indiÄator is the culprit.
The engine troubleshooting chart in
Chap 5 of the bird organizational main´
tenance pub shows that the problem could
be eËtÌer one, birdmechs.
THE
ToT
GAGE
.COULD
BE
WRoNG
You ÄoÍld save ±ourself some witch hunting b± cheÄking out the TOT s±steÎ from
thermocouples thrÏugh to Äockpit gage.
Chap ³0 in the pub has t»e word on how to replace a fault± indicator.
GUNSHIP GAMBLER?
.±
²
b³
You wan ta bet that t»e retaÐnÐng nut on
±our Hue±Cobra²s dual h±drÑulic c±linder
housing is lock-wired according to Ho±le?
A Numbah 1 safet±wired pat hand calls
Òr ³ positive and 1 negative safet±Ó180°
apartºusing double twist single safet±
wÔrÕ.
SaÖe deal goes f×r ØH-I¾, H, too.
StiÙl wanta bet?
53
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