TM 55-2840-231-23
4-5. Power Turbine Outer Coupling Nut - Inspection
INITIAL SETUP
Applicable Configuration
Consumable Materials
All
None
ENGINE/POWER
TURBINE OUTER
COUPLING NUT
1. Inspection
a. Engines identified by the suffix c after the
Engine Serial Number do not need
inspection. Examples: AE4081OOABC,
AE402603BC. These engines will have had
the new nut P/N 23001801 installed.
b. The OH-58A inspection requires removal
of the engine cowling and exhaust stacks
(Refer to TM 55-1520-228-23/1). The OH-6A
inspection requires removal of exhaust tail-
pipes (Refer to TM 55-1520-214-23 ).
a. The nut is located
approximately one and
one half inches forward of
the fourth stage turbine
wheel inside the Center
section of the exhaust
collector support. (Refer to
illustration.)
b. The condition of the
nut can be determined
with the use of the mirror
or polished metal and a
high intensity light
source.
c. Insert the mirror or
polished metal halfway
inside the exhaust
collector, holding the light
source in a position such
that the light falls upon
the nut.
d. Position the mirror or
polished metal until the
nut is in view.
e. Insert the equipment
and slowly rotate the
fourth stage turbine
wheel by hand so that the
4-4
Change 11
