* * * FOR ALL
TASK 72-53-44-100-801
1 . General.
  A.This procedure gives instructions to clean the high pressure turbine (HPT) rotor aft seal (aft seal) (01-090 , 72-53-00) (SIN 150B4). 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. None.
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
 
70-21-10
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 72-53-44-160-001
A.Optional Procedure. Pre-clean the aft seal.
Subtask 72-53-44-110-001
(1)Alternative Procedure Available. Use the light-duty aqueous cleaning procedure to pre-clean the aft seal. Refer to TASK 70-21-22-110-042 (CLEANING METHOD 22 - LIGHT DUTY AQUEOUS CLEANING (Method 1)).
Subtask 72-53-44-160-002
(1).A.Alternative Procedure. Use the steam cleaning procedure to pre-clean the aft seal. Refer to TASK 70-21-03-160-001 (CLEANING METHOD 3 - STEAM CLEANING).
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Figure 601   Aft Seal - Cleaning
Subtask 72-53-44-110-002
B.Alternative Procedure Available. Use the four-step alkaline clean and acidic descaling procedure to clean the aft seal. Refer to TASK 70-21-10-110-008 (CLEANING METHOD 10 - FOUR-STEP ALKALINE CLEANING AND ACIDIC DESCALING (WITHOUT INHIBITED PHOSPHORIC ACID)).
Subtask 72-53-44-110-003
B.A.Alternative Procedure. Use the four-step alkaline clean and acidic descaling procedure to clean the aft seal. Refer to TASK 70-21-20-110-038 (CLEANING METHOD 20 - FOUR-STEP ALKALINE CLEANING AND ACIDIC DESCALING (WITH INHIBITED PHOSPHORIC ACID)).
Subtask 72-53-44-120-001
B.B.Alternative Procedure. Wet abrasive blast clean the aft seal 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).