PS Magazine - TB 43-PS-713
PS, The Preventative Maintenance Monthly
ISSUE 713
APRIL 2012
22
PS 713
APR 12
23
PS 713
APR 12
± When±the±lights±flicker±on±the±pilot±pulls±the±fire±extinguisher±handle±to±snuff±out±
flames±if±the±crew±chief±confirms±the±fire±by±checking±through±the±observation±bubble±
window.±
± Fire±detection±lights±can±deliver±false±alarms.±Sometimes±the±fire±sensing±element±
lines,±NSN±1680-00-895-9426±and±NSN±1680-00-895-9427,±chafe±against±the±airframe±
surface.
± Stop±
chafing±
by±
checking±
the±
sensing±element±lines±during±pre-flight±
inspections.±Push±the±lines±away±from±
the±airframe,±but±make±sure±they±are±
not±kinked±because±that±will±set±off±a±
fire±light.±On±the±next±phase±inspection,±
try±positioning±the±lines±differently±so±
they±are±not±too±close±to±the±airframe.±
Replace±damaged±lines.
± Do± your± daily± inspection± of± the±
fire±detection±elements±like±it±says±in±
TM±1-1520-271-PMS1±for±the±F-Model.±
For± the± D-model,± use± TM± 1-1520-240-
PMS1,±insp#±12.22±and±insp#±14.21.
M
echanics, using the right tool to remove your Black Hawk main rotor blade pins is the
right way to do the job.
When removing blade pins, always use a cotter pin puller to pull out the cotter pin.
Blade pins must be removed if:
± ± 1.
the breakaway torque is less than 32 lb-ft.
± ± 2.
less than two threads are shown after a tension check and the nut is tightened.
a.
Inspect the blade pin for nicks, dents, scratches, corrosion and tool or scuff
marks within critical areas as shown in Fig 1 of WP 0542 00-2.
b.
Replace the pin if tolerances exceed work package specs.
The wrong way to remove the blade pin is to use channel lock pliers or diagonal wire
cutters to extract the cotter pin. These tools are often braced against the spindle cuff
washer for leverage. Removing blade pins this way can damage the pins.
Damage can also occur if you try to pound the pin out of the spindle instead of
tapping it out lightly with a rubber hammer. Beating on a blade pin damages and
unseats the pin’s bushings.
If you use the wrong tools or pound on the pin, you might not be able to completely
remove a damaged or stuck blade pin at all. If you damage the spindle washer or blade
pin, and the pin gets stuck, remove it like it says in the main rotor blade work package of
TM 1-1520-237-23. A stuck blade pin is a monster to get out.
When you use the right tool, you’ll get the right result and no headaches.
CH-47D/F…
is
there an engine fire?
UH-60 Series…
Go
Easy
on Blade Pins
the chinook cockpit fire
detection lights might
spook you by coming
on,
but think
twice
before
you pull the fire
extinguisher handle.
these D-ModeL
pilots are on to
something. you
F-Model pilots
should take
notice, Too.
oh no!
the fire
detection lights
are on!
we must have
an engine fire!
or it
could
just be The
sensing element lines
chafing since we
forgot
to inspect them.
hey, I have
the channel
lock!
and I’ve got
the diagonal wire
cutters. let’s get
to work on those
blade pins!
whoa!
wait a
minute!
the
only
tool
you can use on my
blade pins is the
cotter pin puller!
Make sure line is not chaffing against airframe
Use cotter pin puller…
…
not
channel lock…
…or diagonal wire cutter
713 22-23.indd
1-2
2/24/12
2:12 PM
Click here for a copy of this article to save or email.
Click here for a copy of this article to save or email.
Back to TopBack to Top
