TM 55-2840-254-23
4-49 INSTALL FOURTH STAGE POWER TURBINE NOZZLE (AVIM) (Continued)
4-49
25. Turn fourth stage power turbine nozzle (24)
over on table.
26. Measure third stage power turbine rotor (35)
tip clearance at 0, 45, 90, 135, 180, 225, 270
and 315 degree positions as follows.
a. Insert thickness gage between third stage
power turbine rotor blades (36) and fourth
stage power turbine nozzle (24).
b. Rotate third stage power turbine rotor (35)
counterclockwise one revolution for each
check.
c. Tip clearance shall be 0.020 inch minimum.
d. If tip clearance is below 0.020 inch, replace
power turbine assembly.
27. Turn fourth stage power turbine nozzle (24)
over on two tables.
INSPECT
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