4-66 INSTALL FIRST TURBINE DISC ASSEMBLY (AVIM) (Continued)
The first turbine disc assembly, spacer,
second turbine disc assembly, seal, three
locking plates, and six bolts are supplied
as a balanced, matched set. If the first
turbine disc assembly is replaced, all
other parts in the balanced, matched
set shall be replaced. Use field replace-
ment first and second turbine disc as-
sembly, Part No. 2-121-480-03.
If same first turbine disc assembly that
was removed is being installed, omit
step 1. If first turbine disc assembly is
being replaced, do all steps.
1. Place in service field replacement first and sec-
ond turbine disc assembly (Ref. Task 4-72).
2. Determine thickness of rotor shim to establish
clearance between first turbine disc assembly
(1) and first turbine nozzle (2) as follows:
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