* * * FOR ALL
TASK 72-53-42-100-801
1 . General.
  A.This procedure gives instructions to clean the high pressure turbine (HPT) rotor forward seal (forward seal) (01-250 , 72-53-00) (SIN 150A3), (01-250A , 72-53-00) (SIN 150A3), or (02-250 , 72-53-00) (SIN 150A3). Keep this part with the related parts by engine serial number for inspection and assembly. Refer to Figure 601.
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.
 
Code No.
Description
 
C04-112
Grit, Aluminum Oxide, 500 Mesh (Abrasive Compound, 500 Mesh)
C.Referenced Procedures.
 
ATA No.
Description
 
70-00-99
Wet Abrasive Blasting - Aluminum Oxide 500 Grit
 
70-21-03
Steam Cleaning
 
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)
 
70-21-22
Light-Duty Aqueous Cleaning
D.Expendable Parts. None.
3 . General Cleaning.
Subtask 72-53-42-110-001
A.Clean the forward seal as follows:
(1)Alternative Procedures Available. Light-duty aqueous clean the forward seal. Refer to TASK 70-21-22-110-042 (CLEANING METHOD 22 - LIGHT DUTY AQUEOUS CLEANING (Method 1)).
* * * FOR ALL
Figure 601   Forward Seal
Subtask 72-53-42-160-001
(1).A.Alternative Procedure. Steam clean the forward seal. Refer to TASK 70-21-03-160-001 (CLEANING METHOD 3 - STEAM CLEANING).
Subtask 72-53-42-110-002
(1).B.Alternative Procedure. Four-step alkaline clean and acidic descale the forward seal. Refer to TASK 70-21-10-110-008 (CLEANING METHOD 10 - FOUR-STEP ALKALINE CLEANING AND ACIDIC DESCALING (WITHOUT INHIBITED PHOSPHORIC ACID)).
Subtask 72-53-42-110-003
(1).C.Alternative Procedure. Four-step alkaline clean and acidic descale the forward seal. Refer to TASK 70-21-20-110-038 (CLEANING METHOD 20 - FOUR-STEP ALKALINE CLEANING AND ACIDIC DESCALING (WITH INHIBITED PHOSPHORIC ACID)).
Subtask 72-53-42-110-007
(1).D.Alternative Procedure. Heavy-duty alkaline clean the forward seal. Refer to TASK 70-21-06-110-004 (CLEANING METHOD NO. 6 - HEAVY-DUTY ALKALINE CLEANER (WITHOUT INHIBITED PHOSPHORIC ACID)).
Subtask 72-53-42-120-001
(2)Alternative Procedure Available. If the initial procedure does not remove all unwanted material, wet abrasive blast clean the forward seal. Refer to TASK 70-21-05-120-B02 (Wet Abrasive Blast Cleaning Method 5B). Use C04-112  Abrasive Compound, 500 Mesh.
Subtask 72-53-42-120-003
(2).A.Alternative Procedure. If the initial procedure does not remove all unwanted material, wet abrasive blast clean the forward seal. 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).