TM 1-2840-252-23-2
4-50
INSTALL FOURTH STAGE POWER TURBINE NOZZLE (AVIM) (Continued)
4-50
Turn fourth stage power turbine nozzle (24) over
29.
on table.
Measure third stage power turbine rotor (38) tip
30.
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 (39) and fourth stage power
turbine nozzle (24).
b.
Rotate third stage power turbine rotor (38)
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.
Turn fourth stage power turbine nozzle (24) over
31.
on two tables.
INSPECT
FOLLOW-ON MAINTENANCE
Install Fourth Stage Power Turbine Rotor (Task 4-36).
Install Third Turbine Nozzle and Support (Task 4-32).
Install Thermocouple Harness Assemblies (Task 4-
Assemble Combustion Section and Power Turbine
Install Combustion Section and Power Turbine (Task
Service Engine Oil System (Task 1-68).
END OF TASK
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