PS Magazine - TB 43-PS-563
PS, The Preventative Maintenance Monthly
ISSUE 563
OCTOBER 1999
Pitch case housing / lead lag link and strap pack alignment tool
You will need two quick release pins, NSN 5315-01-195-6060, to attach the
spacing fixture to the main rotor feathering bearing.
Place tool under feathering bearing
Install pins
PS 563
39
OCT 99
PS 563
38
OCT 99
this
oughta put
that bearing
in its
place!
Doing it
that
way will
damage
the
leading link's
liner. there's a
better way.
Just position the spacing fixture un-
der the main rotor feathering bearing
and install its pins. After the fixture
tool is attached, the pitch housing is
correctly aligned and you can install
the bearing without damaging the liner.
The bearing falls right into place—no
pounding.
Don’t forget to attach red “Remove
Before Flight” streamers, NSN 8345-
00-673-9992, to the spacing fixture and
to the two quick release pins when the
tool is in use. Swaging sleeve, NSN
4030-00-960-1654, and wire rope, PN
17054, CAGE 4R506, can be used to
attach the streamers to the spacing fix-
ture tool. You need to submit an ex-
ception data requisition, DD Form
1348-6, to obtain the swaging sleeve
and wire rope. For the swaging sleeve,
write “NSN not in the AMDF” in the REMARKS block.
This tool will be added to Appendix D, TM 1-1520-238-23, and the procedure
to use it will be added to the existing procedure in para 5-32 of the same manual.
pache repairers, do you find it difficult to align the pitch housing while
inserting the main rotor lead lag link bearing? Often, this struggle leads to
forcing and pounding the bearing into place, and ends with damage to the lead
lag link’s Teflon liner.
Don’t force, don’t pound—there’s an easier way. You can have a spacing
fixture tool made that lets you install the bearing without forcing or pounding. It
aligns the lead lag link bore hole, saves installation time and saves your unit the
replacement cost of lead lag links with damaged liners.
The aviation intermediate maintenance (AVIM) unit that supports your Apache
aircraft can make this spacing fixture for you, using 2024 T3 aluminum.
AH-64 . . .
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