PS Magazine - TB 43-PS-686
PS, The Preventative Maintenance Monthly
ISSUE 686
JANUARY 2010
38
PS 686
JAN 10
It may stop the vibration in the short term, but it will create long term problems if you
don’t locate the root cause of the problem.
It’s a chore trying to Fnd the source of the vibration but it can be done. Locating and
repairing vibration problems will help your M230 Fre straight and true.
M
echanics, use the proper tools and materials to clean the 30mm gun motor cannon
plug on your AH-64s
When cleaning gun parts, the right tool always does the best job. The wrong tool,
like your handy-dandy pocket tool, causes damage.
Clean the grit and corrosion from the cannon plug and its pins with an acid
swabbing brush, NSN 7920-00-514-2417, and isopropyl alcohol, not a pocket tool.
These tips and
other measurements
for checking turret
vibration have been
added to tasks
in IETM 1-1520
Longbow Apache
and in TM 9-1090-
208-23-1-1. Look for
them in upcoming
changes.
A pocket tool is handy for all types of things, but not for a cannon plug. It can
cause damage to the plug and pins.
•
With barrel removed, check the front inside diameter of the
barrel support for excessive wear. The diameter should be no
more than 2.563 inches (65.1 millimeters).
•
Check the mating area (raised area where the barrel contacts
barrel support) for excessive wear. The diameter of the raised
portion should be no less than 2.554 inches (64.8 MM).
•
Use calipers to measure at several locations around the
diameter. Replace parts where the damage exceeds the limits.
•
Make sure your recoil adapters are properly serviced and
check out the vibration related fault isolation procedures
(Armament System ±IPs) in your TMs.
Not
AH-64A/D…
Rubbing
and
Shaking
Not
Allowed
AH-64D…
The
Right
Tool for
Cleaning
If cannon plug is dirty, clean
with acid swabbing brush…
…
not
with metal scrub brush or pocket tool
Gun rubbing and shaking?
Use tips and TM to isolate the problem
use these tips
to shake down
the vibration
problem.
armament crews,
if you’re picking
up vibrations
from the barrel
of your ah-64’s
m230 automatic
gun, putting a
piece of paper
between the
barrel and the
barrel support
is
not
a
permanent fix.
•
Check the mating area (raised area where the barrel
contacts barrel support) for excessive wear. The diameter
of the raised portion should be no less than 2.554 inches
(64.8 millimeters).
cleaning
time!
ok, but the
only
tool
you can use on my gun’s
cannon plug is that
acid
swabbing brush!
2.563” Max.
2.554” Min.
686.38-39.indd
1-2
12/1/09
11:55:16 AM
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