PS Magazine - TB 43-PS-609
PS, The Preventative Maintenance Monthly
ISSUE 609
AUGUST 2003
Until the TM is
changed, make a note
to clean the drain holes.
PS 609
AUG 03
36
T
o get a handle on corrosion and to stay ahead of the game, eyeball every nook and
cranny of your bird. For example, prior to rotor head or blade installation, check out
the drain holes in the opening of each pitch-varying housing where the tie bar pin
weights are installed.
The opening on the inside of
the weight cavity area of each
pitch-housing has a drain hole—
that’s just above the tie-bar pin—
for draining water and moisture.
If sediment and dirt clog the
hole, water and crud will back up
into the cavity and corrosion can
cause extensive metal damage.
That can lead to depot repairs if
the drain holes are not kept
clean. Use a pipe cleaner, NSN
9920-00-292-9946, to remove
any debris that clogs the hole.
When weights are removed, check
drain holes and use pipe cleaner
for clogs inside each caviity
Clean drain holes when
blades are removed
looks like
we’ve got
a blade
problem!
ok. remove
‘em and
fix ‘em…
but,
before
you install
‘em, check my
pitch housing
drain holes
for clogs.
CH-47D…
Stop
Corrosion
Dead in its Tracks
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