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TASK 72-31-00-800-801
1 . Machining of the High Pressure Compressor Blade Lock Setscrews.
A.This procedure gives instructions to drill out the setscrews of the high pressure compressor (HPC) stages 6 thru 10 blade locks.
2 . Tools, Equipment, and Materials.
NOTE:
You can use equivalent alternatives for tools, equipment, and consumable materials.
A.Tools and Equipment.
(1)Special Tools.
 
Tool No.
Description
 
11C4597G02
Tool, Removal - HPC Locking Lugs (removal tool)
(2)Standard Tools and Equipment.
 
Description
Manufacturer
 
No. 20 Drill
Deleted
 
Drill 1/8 inch (3.18 mm)
Local Purchase
 
Drill 5/64 inch (1.98 mm)
Deleted
 
Drill 0.161 inch (4.09 mm)
Local Purchase
(3)Locally Manufactured Tools.
 
Description
Figure
 
Drill Stop Sleeve
901
B.Consumable Materials. None.
C.Referenced Procedures. None.
D.Expendable Parts. None.
E.SPD Information. None.
F.Special Solutions. None.
G.Test Specimens. None.
3 . Dimensional Information.
None.
4 . Setup Information.
None.
5 . Procedure.
Subtask 72-31-00-040-076
CAUTION:
IF THE ROTOR IS ASSEMBLED INTO THE ENGINE, IT IS RECOMMENDED TO USE A BLANKET TO PROTECT THE ROTOR DURING THE LUG REMOVAL. A SMALL BLANKET MUST BE USED TO PROTECT THE AREA WHILE THE LOCKING LUG SET SCREWS ARE DRILLED OUT. THIS WILL HELP PREVENT CHIPS FROM FALLING DOWN INTO THE LOWER PART OF THE ROTOR ASSEMBLY. A PORTABLE VACUUM SYSTEM CAN BE USED TO HELP KEEP THE AREA FREE OF CHIPS AS WELL.
CAUTION:
IF THE ROTOR HAS BEEN ASSEMBLES IN THE ENGINE, BE CAREFUL NOT TO DROP THE BLADES OR LOCKING LUGS INTO THE ROTOR CASE ASSEMBLY. DAMAGE TO THE ROTOR CAN OCCUR.
A.Alternative Procedure Available. Use the 11C4597   removal tool to remove the locking lugs that cannot be removed with a standard hexagonal wrench. Refer to Figure 201 and do as follows:
Subtask 72-31-00-320-009
(1)Use a shock bar (item 7) to lightly hit the locking lug set screws to help removal.
(2)Retrieve the smaller diameter of the two drill bit holders (item 2).
(3)Loosen the set screw (item 13) so that the drill bit (item 5) can slide freely.
(4)Place the drill bit (item 5) into the hole on the gage (item 8) corresponding to the compressor stage being worked on.
(5)Make sure that the drill bit (item 5) is touching the inner surface of the gage (item 8) and that the drill bit holder (item 2) is touching the top surface of the gage (item 8).
(6)Tighten the screw (item 13) until the drill bit (item 5) can no longer move.
(7)Remove the drill bit holder (item 2) from the gage (item 8).
CAUTION:
MAKE SURE THAT THE TOTAL LENGTH OF THE DRILL BIT (ITEM 5) DOES NOT EXCEED THE GAP IN THE GAGE (ITEM 8) FOR THE APPROPRIATE STAGE OR DAMAGE TO THE ROTOR CAN OCCUR.
(8)Contact the locking lug set screws with the drill bit (item 5) and use a power drill to drill a pilot hole.
(9)Do paragraph 5.A.(4) thru 5.A.(9) again with the larger diameter drill bit holder (item 12) and drill bit (item 11).
(10)Contact the pilot hole (previously drilled in step 8) with the drill bit (item 11) and use a power drill to drill a pilot hole.
(11)Remove and discard the locking lug.
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Figure 201   (Sheet 1 ) Locking Lug Removal Tool, 11C4597
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Figure 201   (Sheet 2 ) Locking Lug Removal Tool, 11C4597
Subtask 72-31-00-930-001
A.A.Alternative Procedure. Use a locally manufactured tool to remove the locking lugs that cannot be removed with a standard hexagonal wrench.
(1)Make the drill stop sleeve. Refer to Figure 202.
Subtask 72-31-00-320-005
CAUTION:
BE CAREFUL WHEN DRILLING OUT THE LOCKING LUG SETSCREW. THE SPOOL OR ADJACENT PARTS CAN BE EASILY DAMAGED.
(2)Put the applicable drill in the center of the setscrew. Refer to Figure 203.
Subtask 72-31-00-320-006
CAUTION:
THE SETSCREW MATERIAL (WASPALLOY) BECOMES HARDER WHEN DRILLING IT. MAKE SURE TO OBEY THE PRECAUTIONS THAT FOLLOW IN ORDER TO PREVENT DAMAGE.
(3)Remove the setscrew threads as follows:
(a)Use a sharp drill at low speed and use coolant.
(b)Use a coolant feed and do not let the drill dwell.
(c)Remove the set screw threads by firstly drilling a pilot hole in the set screw with the appropriate pilot drill holder and collar. The correct depth is reached when the collar touches the locking lug.
(d)Change the pilot drill holder to the final drill holder using the appropriate collar. Remove the set screw threads, the correct depth is reached when the collar touches the locking lug.
(4)Use a hammer and a punch to move the blade lock against the dovetail slot bottom.
(5)Remove the blade lock.
(6)Remove the blades.
Subtask 72-31-00-160-010
(7)Clean the spool with a lint-free cloth and remove all of the coolant and metal chips.
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Figure 202   Locally Manufactured Drill Stop Sleeve
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Figure 203   Blade Lock Removal Typical for Stages 8 thru 10