PS Magazine - TB 43-PS-582
PS, The Preventative Maintenance Monthly
ISSUE 582
MAY 2001
PS 582
MAY 01
37
MAY 01
Shooting
Straight
T
he AH-64's M230 gun won't be doing much straight shooting if you repairmen
haven't been straight with its PMCS. So pay particular attention to these checks as
you do the PMCS in Para 4-5-1 in TM 9-1090-208-23-1-1.
Timing
With the gun off the aircraft, position three dummy rounds in the rotor while
turning the vertical drive shaft clockwise until all three cartridges are ejected from
the gun. If the timing's correct, the rounds should cycle smoothly. If the gun jams,
the timing needs to be checked. The timing procedure is in Para 4-7-9 of TM 9-
1090-208-23-1-1.
Ammo Handling Subsystem
As you cycle the rounds through the
ammo handling system, check each link
for a cotter pin and look at the connect-
ing pin. If a pin is missing, the convey-
or belt could come apart during firing.
Bent connecting pins cause rough oper-
ation during uploading, downloading
and firing. See Para 4-7-142 in -23-1-1
for info on replacing the cotter pins.
Cotter pin
missing?
Connector
pin bent?
Recoil Mechanisms
At around 72° F (+/- 10°) the indicator
groove of the piston should be visible
through the recoil's check hole. At higher
temperatures, the groove may be to the
edge of outside the piston rod. At lower
temperatures, the end of the piston should
be at least flush with the check hole. If not,
the recoil is low on silicone lubricant, NSN
9150-01-056-7346, and the gun could be
damaged during firing. Info on servicing
the recoil is in Para 4-7-7 of TM 9-1090-
208-23-1-1.
If you expect
straight shooting
from
me,
buddy… you
better be straight
with me on
PM!
AH-64 Aircraft.
..
36
Shooting
Straight
Groove
visible?
582. 36-37 (C)
3/27/01
4:10 PM
Page 1
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