4-36 INSPECT FOURTH STAGE POWER TURBINE ROTOR (AVIM) (Continued)
The fourth stage power turbine rotor is a critical
component for which life cycle data will be recorded
and stored in the DECU on the aircraft If fourth stage
power turbine rotor is a replacement, it is essential to
up-date life cycle count in engine history data stored in
the DECU via the engine history recording terminal
(EHRT) (T37) (Ref TM 1-1520-252-23).
1. Determine how much of shaft (1) should protrude
from fourth stage power turbine rotor fter fourth
turbine rotor is installed.
a. Measure from end (2) of shaft (1) to aft face of
faceplate (3)Record as Dimension A.
b. Place fourth stage power turbine rotor (4) wit hub
on locating bar (T33) (5) Measure from aft face of
hub (6) to locating bar (T1) (5). ecord as
c. If ring spacer (7) was not removed, subtract
Dimension B from Dimension A The answer is how
much of shaft should protrude from fourth stage
power turbine rotor Record for later use
If ring spacer was not removed, go to step 4.
measure thickness of it. Record as Dimension
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