TASK 72-50-53-100-010 Turbine Exhaust Case (TEC) - Clean The No.5 Bearing Oil Service Tubes, Alkaline Gel Method, Repair-010 - Pre SB 72-0063

DMC:V2500-A0-72-50-5301-01A-251A-C|Issue No:002.00|Issue Date:2013-11-01

Export Control

EAR Export Classification: Not subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3), except for the following Service Bulletins which are currently published as EAR Export Classification 9E991: SBE70-0992, SBE72-0483, SBE72-0580, SBE72-0588, SBE72-0640, SBE73-0209, SBE80-0024 and SBE80-0025.

Copyright

© IAE International Aero Engines AG (2001, 2014 - 2021) The information contained in this document is the property of © IAE International Aero Engines AG and may not be copied or used for any purpose other than that for which it is supplied without the express written authority of © IAE International Aero Engines AG. (This does not preclude use by engine and aircraft operators for normal instructional, maintenance or overhaul purposes.).

Applicability

All

Common Information

TASK 72-50-53-100-010 Turbine Exhaust Case (TEC) - Clean The No.5 Bearing Oil Service Tubes, Alkaline Gel Method, Repair-010 - Pre SB 72-0063

Effectivity

FIG/ITEM

PART NO.

01-001

4A8014

01-001

4A8025

General

This TASK gives the procedure to clean coke and varnish from the ID of the No. 5 bearing pressure and scavenge tubes (welded, non-removable) with an alkaline gel cleaner from the SPM TASK 70-11-55-110-501 when:

An exhaust case is not completely disassembled for chemical immersion cleaning

A low time exhaust case is not being removed from the LPT case and carbon is suspected or found in the tubes

Tubes are not completely blocked or heavily coked

The engine or exhaust case is in the horizontal position

For the other parts of the turbine exhaust case assembly, refer to TASK 72-50-53-100-000 (CLEANING-000).

The practices and processes referred to in the procedure by the TASK numbers are in the SPM.

Fig/item numbers in parentheses in the procedure agree with those used in the IPC. Only the primary Fig/item numbers are used. For the service bulletin alpha variants refer to the IPC.

Reference

Refer to the SPM for data on these items.

NOTE

To identify the consumable materials refer to PCI.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Flexible 4 mm or 6 mm white light video borescopeLOCALFlexible 4 mm or 6 mm white light video borescope
5 gallon (18.93 liters) plastic bucketLOCAL5 gallon (18.93 liters) plastic bucket2
Tapered rubber plugs with shouldersLOCALTapered rubber plugs with shoulders2
1 pint plastic squeeze bottle with nozzleLOCAL1 pint plastic squeeze bottle with nozzle
Latex glovesLOCALLatex gloves

(two pairs)

Flexible retrieving toolLOCALFlexible retrieving tool

Grainger No. 5C591, Model 2345

Consumables, Materials and Expendables

NameManufacturerPart Number / IdentificationQuantityRemark
CoMat 01-124 ISOPROPYL ALCOHOLLOCALCoMat 01-124
CoMat 02-125 ELECTROLYTEk3504CoMat 02-125
CoMat 02-159 LACING TAPELOCALCoMat 02-159

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-50-53-110-141 Clean the Tubes

      CAUTION

      DO NOT USE A WIRE BRUSH OR STEEL CABLE TO CLEAN THE TUBES SINCE SCRATCHES ON THE ID TUBE WALLS CAN CAUSE COKE TO FORM.

    1. Remove the insulation from the tubes and bolts which hold the tubes to the case.

    2. Remove the bolts and nuts which hold the pressure and scavenge tube clamps to the engine flange brackets.

    3. Rotate the pressure tube flange ends 180 degrees rearward. Pull the scavenge tube back approximately 0.500 in. (12.7 mm).

      NOTE

      CoMat 01-124 ISOPROPYL ALCOHOL can be sprayed into the tubes to help remove the oil, so it does not coat the lens of the borescope.

    4. Blow out tubes with compressed air to remove any residual oil from the bearing compartments side.

    5. If not already done, examine with a video borescope, the full length of the ID of the tubes for evidence of coking. The inside of the tubes must appear smooth and round and free of coke nodules or flakes. If coke is found, continue with the cleaning procedure.

    2. SUBTASK 72-50-53-110-142 Clean the Pressure Tubes Only

      CAUTION

      THIS PROCEDURE USING THE SCRUB PAD ONLY APPLIES TO THE PRESSURE TUBE AND WILL NOT WORK ON THE SCAVENGE TUBE BECAUSE THE GEOMETRY OF THE TUBE WILL CUT THE LACE AND THE SCRUB PAD WILL BECOME LODGED IN THE SCAVENGE TUBE.

      NOTE

      If you cut the pieces too big, the scrub pad will bunch up and get caught in the pressure tube.

    1. Cut the scrub pad into 2 pieces approximately 4.00 ins long by 0.250 in. wide (101.6 mm) long by (6.35 mm) wide.

    2. Cut one piece of lace, approximately 60.00 ins (1524 mm) in length. Tie the two scrub pad pieces onto the lace, and use the lace to make knots around the pads, approximately every 4.00 ins (101.6 mm) equally spaced, 30 ins (762 mm) from one end of the lace.

    3. Put the end of the lace without the tied-on pads into the pressure tube and blow the lace through to the other end of the tube with compressed air.

    4. While you hold both ends of the lace, pull the lace back and forth through the pressure tube.

    5. Pull out the lace and pads from the pressure tube. Blow out tubes with compressed air and borescope again. If coking remains, lean using an alkaline gel cleaner as follows to clean both pressure and scavenge tubes. Refer to the SPM TASK 70-11-55-110-501.

    3. SUBTASK 72-50-53-110-143 Clean the Pressure and Scavenge Tubes

    1. Put buckets on the floor under the tubes.

    2. Put a latex glove over each rubber plug. This prevents the plug from slipping out of the tube.

    3. Pour the alkaline gel cleaner into a squeeze bottle that has a flexible nozzle end. If necessary, dilute the gel with water so it flows easily into the tubes. Slowly pour the alkaline gel into the upper end of each tube next to the bearing area of the engine until the alkaline gel flows out the bottom of the tubes. Refer to the SPM TASK 70-11-55-110-501.

    4. Install rubber plugs into the tubes to prevent the alkaline gel from draining from the tubes. Top off the tubes with the alkaline gel as the air is displaced from the tubes.

    5. Let the alkaline gel soak in the tubes for approximately 30 - 60 minutes.

    6. Remove the plugs from the lower end of the tubes to allow the alkaline gel to drain into the buckets.

    7. Fully rinse the tube with water from the upper end of the tubes until the water runs clear through the tubes.

    8. Check the final rinse water as it comes out of the tubes. It must not have a slippery feel to it compared to tap water. If it does, some alkaline cleaner remains which will require more rinsing.

    9. Blow out and dry the tubes with compressed air.

    10. Examine the full length of each tube ID with a video borescope, to make sure there is no residual coke. Do the procedure again if necessary.

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Editorial correction due to conversion

Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Link not Found
Manufacturer Code:LOCAL
Supply Number:CoMat 01-124
Type:sp01
Supply Short Name:CoMat 01-124 ISOPROPYL ALCOHOL
Supply Name:CoMat 01-124 ISOPROPYL ALCOHOL
Specification Groups:
Doc NumberType
OMAT:1/40GPR TECHNICAL GRADE
PMC 9094GPR TECHNICAL GRADE
JCR-011GPR TECHNICAL GRADE
Suppliers:
ManufacturerRemarks
LOCAL
U1185
24853
K6835
Manufacturer Code:k3504
Supply Number:CoMat 02-125
Type:sp01
Supply Short Name:CoMat 02-125 ELECTROLYTE
Supply Name:CoMat 02-125 ELECTROLYTE
Specification Groups:
Doc NumberType
EM.16A OMAT: 265
Suppliers:
ManufacturerRemarks
k3504
IE200
Manufacturer Code:LOCAL
Supply Number:CoMat 02-159
Type:sp01
Supply Short Name:CoMat 02-159 LACING TAPE
Supply Name:CoMat 02-159 LACING TAPE
Specification Groups:
Doc NumberType
T085 OMAT: 274
Suppliers:
ManufacturerRemarks
LOCAL
IE218
K6835
Manufacturer Code:LOCAL
Tool Number:1 pint plastic squeeze bottle with nozzle
Tool Name:1 pint plastic squeeze bottle with nozzle
Manufacturer Code:LOCAL
Tool Number:5 gallon (18.93 liters) plastic bucket
Tool Name:5 gallon (18.93 liters) plastic bucket
Manufacturer Code:LOCAL
Tool Number:Flexible 4 mm or 6 mm white light video borescope
Tool Name:Flexible 4 mm or 6 mm white light video borescope
Manufacturer Code:LOCAL
Tool Number:Flexible retrieving tool
Tool Name:Flexible retrieving tool
Manufacturer Code:LOCAL
Tool Number:Latex gloves
Tool Name:Latex gloves
Manufacturer Code:LOCAL
Tool Number:Tapered rubber plugs with shoulders
Tool Name:Tapered rubber plugs with shoulders