PS Magazine - TB 43-PS-629
PS, The Preventative Maintenance Monthly
ISSUE 629
APRIL 2005
PS 629
APR 05
39
CH-47D…
m
echanics, let’s say it’s washing time again for your Chinook. You want to get it
as clean as possible so you turn up the water pressure a notch. Don’t!
When washing the FWD and AFT combining transmission oil cooler on or off the
bird, high pressure water can bend the cooler fins. Bent oil cooler fins mean air can’t
properly flow through the oil cooler when your aircraft is up and running.
That can cause elevated oil cooler temperatures and cause the OIL HOT light to
illuminate on the caution advisory panel. Then your bird’s transmission will run hot-
ter than normal.
Low pressure water or a nozzle that has a rinse or spray flow is best, depending
on what type of washer your unit uses. You can find washing instructions in TM 55-
1520-240-23-1 and TM 1-1500-344-34.
Take the pressure off and wash the transmission oil cooler carefully so bent fins
don’t become a problem and high oil temps don’t ground your bird.
‘Course, always follow the TM and never use high pressure water when washing
any portion of the bird because it can penetrate seals and connectors causing dam-
age to components and systems.
PS 629
APR 05
38
HH-60L/UH-60A/L…
M
echanics, when it’s time to service the Black Hawk swashplate at 500 hours/12
months, ease up on the grease.
Too much grease or too frequent lubrication won’t improve your bird’s perform-
ance.
Lubricate the swashplate like it says in Para 1-5-3 of TM 1-1520-237-23-1 and
observe the
CAUTION
on Page 1-5-5. Rotate the rotor and add grease to the four fit-
tings until you see it ooze from the upper or lower bearing seal. Wipe off any excess.
If you add that extra pump of grease just to be safe, you’ll be sorry you did.
When the helicopter rotor head is at full speed, grease will be sprayed everywhere.
Then you’ll be cleaning up grease from the top of your bird, the inside of the
hydraulic section, the transmission section and the AN/ALQ-144A countermeasure
set.
You’ve heard the saying, “a little dab ‘ll do ya’.” For the swashplate, a few extra
dabs of grease will do you in—and make a real mess to clean up!
Service swash
plate fittings
like TM
says
I’ll be
there in just
a minute to
grease you!
just gimme
what the tm
says is good
for me… and
no more!
Wash
with
care…
No high-pressure water…
…either on or off the bird
to get you
clean,
I’ve
got the
pressure
way up!
n-
{sputter}
n-
{pfft}…
no!!
why
not?
629.38-39(C)
2/21/05
4:42 PM
Page 1
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