* * * FOR ALL
TASK 72-31-45-100-801
1 . General.
A.This procedure gives instructions to clean the HPC rotor stage 6-10 spool (spool).
•
Spool (01-480 , 72-31-00) (SIN 050AR)
•
Spool (01-481 , 72-31-00) (SIN 050AR) (SB 72-0051)
•
Spool (02-480 , 72-31-00) (SIN 050AR) (SB 72-0157).
Keep this part with the related parts by engine serial number. Refer to Figure 601 and Figure 601A.
2 . Tools, Equipment, and Materials.
NOTE:
You can use equivalent alternatives for tools, equipment, and consumable materials.
A.Tools and Equipment.
(1)Special Tools. None.
(2)Standard Tools and Equipment. None.
(3)Locally Manufactured Tools. None.
B.Consumable Materials. None.
C.Referenced Procedures.
 
ATA No.
Description
 
70-00-99
Wet Abrasive Blasting - Aluminum Oxide 500 Grit
 
70-21-05
Wet Abrasive Blast Cleaning
 
70-21-06
Heavy-Duty Alkaline Cleaner (Without Inhibited Phosphoric Acid)
 
70-21-10
Four-Step Alkaline Cleaning And Acidic Descaling (Without Inhibited Phosphoric Acid)
 
70-21-20
Four-Step Alkaline Cleaning And Acidic Descaling (With Inhibited Phosphoric Acid)
D.Expendable Parts. None.
* * * FOR ALL
* * * PRE SB   72-0051( Inco 718 Stage 8 Disk )
Figure 601   Stage 6-10 Spool - Cleaning
* * * FOR ALL
* * * SB   72-0051( Rene 88 Stage 8 Disk )
* * * SB   72-0157( Rene 88 Stage 8 Disk )
Figure 601A   Spool - Cleaning
3 . General Cleaning.
Subtask 72-31-45-110-001
A.Alternative Procedures Available. Clean the spool as follows:
(1)Do a heavy-duty alkaline cleaning of the spool. Refer to TASK 70-21-06-110-004 (CLEANING METHOD 6 - HEAVY-DUTY ALKALINE CLEANER (WITHOUT INHIBITED PHOSPHORIC ACID)).
(2)If the initial procedure does not remove all of the deposits, medium wet abrasive blast clean the spool. Refer to TASK 70-21-05-120-B02 (Wet Abrasive Blast Cleaning Method 5B).
Subtask 72-31-45-110-002
A.A.Alternative Procedure. Clean the spool as follows:
(1)Do a four-step alkaline clean and acidic descaling of the spool. Refer to TASK 70-21-10-110-008 (CLEANING METHOD 10 - FOUR-STEP ALKALINE CLEANING AND ACIDIC DESCALING (WITHOUT INHIBITED PHOSPHORIC ACID)).
(2)If the initial procedure does not remove all of the deposits, medium wet abrasive blast clean the spool. Refer to TASK 70-21-05-120-B02 (Wet Abrasive Blast Cleaning Method 5B).
Subtask 72-31-45-110-003
A.B.Alternative Procedure. Clean the spool as follows:
(1)Do a four-step alkaline clean and acidic descaling of the spool. Refer to TASK 70-21-20-110-038 (CLEANING METHOD 20 - FOUR-STEP ALKALINE CLEANING AND ACIDIC DESCALING (WITH INHIBITED PHOSPHORIC ACID)).
(2)If the initial procedure does not remove all of the deposits, medium wet abrasive blast clean the spool. Refer to TASK 70-21-05-120-B02 (Wet Abrasive Blast Cleaning Method 5B).
Subtask 72-31-45-110-004
A.C.Alternative Procedure. Wet abrasive blast clean the spool with 500 grit aluminum oxide. Refer to TASK 70-21-05-120-B02 (Wet Abrasive Blast Cleaning Method 5B) and TASK 70-00-99-801-054 (S1054 - WET ABRASIVE BLASTING - ALUMINUM OXIDE 500 GRIT).
Subtask 72-31-45-350-005
B.Remove the coating from the spool. Refer to Repair.