PS Magazine - TB 43-PS-672
PS, The Preventative Maintenance Monthly
ISSUE 672
NOVEMBER 2008
38
PS 672
NOV 08
39
PS 672
NOV 08
When the leading edge cracks, eyeball the pitch horn area. That’s because the
culprit causing the cracks could be a worn out and loose structural ftting, NSN 1560-
01-100-1701, and retainer assembly, NSN 1615-01-082-9253, inside the pitch horn.
The pitch horn, the hollow part oF the tail rotor blade, contains a structural
ftting. When the ftting breaks loose, it moves and causes splits in the blade’s
leading edge.
The next time you repair a tail rotor blade leading edge like it says in WP 0585 oF
TM 1-1520-237-23-7, make sure you don’t have a shake, rattle and roll inside the
pitch horn.
C
rews, you can’t aFFord to miss a beat when it comes to your Chinook extended
range Fuel system II (ER±S II).
When the ER±S II tanks are
pressure reFueled, make sure you
Follow the procedures like it says
in Paras 2-248-2-249 oF TM 1-
1520-240-10. Place all the valves
in their proper positions during
and aFter pressure reFueling. AFter
reFueling is complete, your bird’s
main Fuel tanks could overflow iF
the valves on the ER±S II tanks
are not in their proper positions.
Make a note oF the warning
on page 2-110 and 2-111 beFore
manually operating the Fuel/deFuel
valve.
IF you leave the valves in the
wrong position, Fuel spills will
occur. That’s a nightmare because
a Fuel spill is a messy cleanup.
UH-60…
Tail
Rotor
Blades
Cracking
Up?
CH-47D…
Pressure Refueling
ERFS II Tanks
Constant leading
edge cracks?
Check for
loose Ftting
and retainer
mechanics, frequently repairing
leading edge cracks on your black
hawk’s tail rotor blades could be
a sign that
something else
is wrong.
another
leading edge
crack.
yeah,
this
happens too
many times.
I’ve seen this
before. the fitting
and retainer inside
the pitch horn are
loose.
Check valves for proper position
±uel spills from vent if valves are left open
hey!!
wait a
minute!
come back
here and
check my
erfsII
tank
valves!
a fuel spill
will be bad
for you!
672.38-39.indd
1-2
9/30/08
10:44:24 AM
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