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 72-50-33-300-030 LPT Stage 3 Rotating Airseal - Blend Repair On The Knife Edge Seals, Repair-030 (VRS4241)
General
Price and availability - none
The practices and processes referred to in the procedure by the TASK number are in the SPM.
Refurbishment of abradable coating on the knife edge seals is not a requirement after blending.
Preliminary Requirements
Pre-Conditions
NONESupport Equipment
| Name | Manufacturer | Part Number / Identification | Quantity | Remark |
|---|---|---|---|---|
| Dial caliper | LOCAL | Dial caliper | ||
| Illuminated comparator magnifier | LOCAL | Illuminated comparator magnifier | ||
| Radius gage set | LOCAL | Radius gage set | ||
| File | LOCAL | File | ||
| Hand held stones | LOCAL | Hand held stones |
Consumables, Materials and Expendables
NONESpares
NONESafety Requirements
NONEProcedure
Keep material removal to the minimum to remove damage.
Do not try to make straight bent knife seal edges.
The total area of blends on each knife seal edge must not be more than 0.093 sqin. (60 sqmm) provided the nearest blend on the adjacent knife edge is more than 2.00in. (50.8 mm) away.
The total area of blends on each knife seal edge must not be more than 0.046 sqin. (30 sqmm) provided the nearest blend on the adjacent knife edge is less than 2.00in. (50.8 mm) away.
Blend damages.
The maximum permitted depth of the blend repair is 0.040in. (1.0 mm).
For dimensions refer to Figure.
Use files and hand held stones.
After blending, the knife seal edge must be burr free.
Blend repair in area A1.
SUBTASK 72-50-33-350-092 Blend Repair the Knife Seal Edges
NOTE
Refer to Repair VRS4244 TASK 72-50-33-300-033.
Rebalance the turbine airseal.
SUBTASK 72-50-33-350-093 Do the Post Repair
Figure: Blend repair the knife seal edges of the stage 3 turbine airseal
Blend repair the knife seal edges of the stage 3 turbine airseal
