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
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Common Information
TASK 72-50-00-300-013 LPT Stage 6 Inner Air Seal - Rebalance the Stage 6 Turbine Inner Air Seal, Repair 013 (VRS4630)
General
Price and availability - none
The practices and processes referred to in the procedure by the TASK numbers are in the SPM.
Make sure that the necessary cleaning and inspection procedures are done before this repair.
NOTE
For more equipment and materials necessary to do this repair refer to the SPM TASK 70-23-05-230-501
and SPM TASK 70-35-19-350-501.
Equivalent equipment may be used.
To identify the consumable materials refer to the PCI.
Special tools are identified in the procedure by the tool primary number.
Preliminary Requirements
Pre-Conditions
NONESupport Equipment
| Name | Manufacturer | Part Number / Identification | Quantity | Remark |
|---|---|---|---|---|
| One plane vertical balancing machine | LOCAL | One plane vertical balancing machine | ||
| IAE 1M14236 Balancing fixture | 0AM53 | IAE 1M14236 | 1 |
Consumables, Materials and Expendables
| Name | Manufacturer | Part Number / Identification | Quantity | Remark |
|---|---|---|---|---|
| CoMat 05-113 EMERY POLISHING PAPER | LOCAL | CoMat 05-113 |
Spares
NONESafety Requirements
NONEProcedure
Keep material removal to the minimum to get balance within limits.
Do not remove material from a small number of areas. Remove material over a larger number, with less removal, to permit more rebalancing procedures.
Machine grind the inner air seal.
Use controlled machining technique (CMT) in a circumferential direction.
Use files for small material removal.
Edges must be rounded 0.008 to 0.020 in. (0,20 to 0,50 mm).
Use butterfly polishing.
Refer to the SPM TASK 70-35-19-350-501.
Remove material to get balance within limits.
Use fine stones and CoMat 05-113 EMERY POLISHING PAPER to make the worked surface as smooth as the adjacent surface if necessary.
Edges are not permitted.
Polish the machined areas.
SUBTASK 72-50-00-350-005 General Instructions for the Rebalancing of the Stage 6 Inner Air Seal after Repair
NOTE
Use IAE 1M14236 Balancing fixture 1 off.
Align TOP marks.
Install the air seal in to one plane vertical balancing machine.
Use balancing by indexing method.
Initial unbalance must not be more than maximum 1.00 oz in. (720 gmm) when attached on diameter B and on plane A.
Remaining unbalance must not be more than maximum 0.10 oz in. (72 gmm).
Do the check for static unbalance of the air seal at 900 RPM minimum.
SUBTASK 72-50-00-350-006 Rebalance the Stage 6 Turbine Inner Air Seal
Do the crack test after material removal but before butterfly polishing to get optimal results.
Refer to SPM TASK 70-35-19-350-501 and SPM TASK 70-23-05-230-501.
Use ulta high sensitivity level.
No cracks are permitted.
Do the test for cracks.
72-50-00-230-003 Examine the Machined Areas for Cracks
NOTE
This is an optional procedure.Refer to Figure.
The surface finish of all machined areas must be as good as the adjacent areas.
Examine the surface finish.
Examine the machined areas dimensionally.
72-50-00-220-003 Do the Post Repair Inspection
Figure: Repair Details and Dimensions
Repair Details and Dimensions
Figure: Repair Details and Dimensions
Repair Details and Dimensions
