TM 1-2840-252-23-2
4-57
INSTALL SECOND TURBINE DISC ASSEMBLY (AVIM) (Continued)
4-57
17. Measure second turbine disc assembly (2) tip
clearance at 0, 45, 90, 124,180, 225, 270 and 315
degree positions as follows:
a. Insert thickness gage (30) between blade tip (31)
and second turbine nozzle inside diameter (32).
NOTE
While rotating second turbine disc assembly, a
slight rubbing sound may be heard. This is normal
due to wearing in of second turbine nozzle labryinth
seal.
b. Measure and record minimum tip clearance
while rotating second turbine disc assembly (2)
counterclockwise one revolution.
c . Tip clearance shall be 0.019 inch minimum.
d. If tip clearance is less than 0.019 inch, repair
GO TO NEXT PAGE
4-311
