4-68 REPAIR FIRST TURBINE ROTOR CASE (AVIM) (Continued)
Subtract lowest tip clearance from MINIMUM
required to clearance 0.019 inch Result is the
Minimum Tip Clearance Required
amount of material to be removed from case (1)
Subtract Lowest Tip Clearance
Amount of Material to be Removed 0.004 Inch
Check housing for position of support. Support
must be installed at the forward position on
housing. If support is not installed at the forward
position on housing, perform step 9.
Remove four screws (12) and move support (13) to
forward position on housing (14). Install four screws
10. Use helper and install milling machine (15), part of
skimming maintenance kit (T44), on adapter (4).
Install washer (16) and two nuts (17) using spanner
wrench, part of skimming maintenance kit (T44).
11. Install counterweight (18)and pin (19).
12. Install cutter (20), part of skimming maintenance kit
(T44) in collet (21) Do not tighten collet (21).
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