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 72-42-20-300-017 No. 4 Bearing Compartment Cooling Air Tube - Weld Build-up Repair Surface Damage, Repair-017 (VRS3643)
General
Price and availability - refer to IAE.
The practices and processes referred to in the procedure by the TASK number are in the SPM.
If the heatshield is going to be replaced as given in Repair, VRS3022, (Repair-002) TASK 72-42-20-300-002 you can do Repair 002 at the same time as this repair. The stress-relief cycle for both repairs can be done at the same time.
Preliminary Requirements
Pre-Conditions
NONESupport Equipment
| Name | Manufacturer | Part Number / Identification | Quantity | Remark |
|---|---|---|---|---|
| Fusion welding equipment | LOCAL | Fusion welding equipment | ||
| Machining equipment | LOCAL | Machining equipment |
Consumables, Materials and Expendables
| Name | Manufacturer | Part Number / Identification | Quantity | Remark |
|---|---|---|---|---|
| CoMat 03-284 WELDING FILLER WIRE, NiBASE | LOCAL | CoMat 03-284 |
Spares
NONESafety Requirements
NONEProcedure
Remove the minimum amount of parent material necessary to remove the damage.
Machine the damaged area to remove wear indications or areas of distress.
SUBTASK 72-42-20-320-071 Machine the Damaged Area of the Cooling Tube
Do the procedure in SPM TASK 70-11-03-300-503.
Wipe the area as given in SPM TASK 70-11-26-300-503 immediately before you weld the repair area.
NOTE
Do not immerse the part.Clean the repair area of the tube.
SUBTASK 72-42-20-110-122 Clean the Area to be Repaired
Do the procedure in SPM TASK 70-31-13-310-501.
Weld the area to be repaired by manual gas tungsten arc welding.
SUBTASK 72-42-20-310-052 Weld Repair the Worn Area of the No. 4 Bearing Cooling Tube
Do the procedure in SPM TASK 70-37-01-370-501.
Stress-relieve the tube.
SUBTASK 72-42-20-370-001 Stress-Relieve the No. 4 Bearing Cooling Tube
Do the procedure in SPM TASK 70-11-03-300-503.
Clean the tube.
SUBTASK 72-42-20-110-123 Clean the No. 4 Bearing Cooling Tube
Do the procedure in SPM TASK 70-23-02-230-501.
No cracks are permitted.
Do a fluorescent penetrant inspection of the tube assembly.
SUBTASK 72-42-20-230-073 Do a Fluorescent Penetrant Inspection of the Repaired Area of the No. 4 Bearing Cooling Tube
CAUTION
THE TUBE ASSEMBLY HAS FIBER INSULATION INSIDE THE HEATSHIELD. DO NOT IMMERSE THE TUBE IN OR MAKE THE INSULATION DAMP WITH FPI FLUID.
Figure: Repair Details and Dimensions
Repair Details and Dimensions
Figure: Repair Details and Dimensions
Repair Details and Dimensions
