View
107
Download
5
Category
Preview:
Citation preview
LM2500
BORESCOPE INSPECTION REPORT
UC DAVIS
CUSTOMER UNIT NAME/NUMBER: N/A
ENGINE SERIAL NUMBER: 481-743
TCT SALES ORDER NUMBER: US9010290
DATE INSPECTED:11-29-2018
SERVICEABILITY AT DATE OF INSPECTION: UNSERVICEABLE
UC Davis Borescope Inspection 481-743
Page 2
BACKGROUND
Customer: UC Davis
Location: Sacramento, Ca
Work Order: US80003427
Performed by: Keith Enox
Package S/N and Manufacturer: S/N: N/A Manufacturer: S&S
Engine Model: LM2500 NGW
Engine Hours: Operating hours: 165,413
Starts: Fired starts: 558 Start attempts: 353
Purpose of Visit:
Perform routine borescope inspection in accordance with GEK 97310, Vol 1, Chapter 5.
Inspect Lube and Scavenge Finger Screens in accordance with GEK 97310, Volume 1, Ch. 5, 5-3.18
Inspect Magnetic Chip detectors in accordance with GEK 97310, Volume 1, Chapter 5, 5-3.18A
Inspection of engine externals I.A.W. GEK 97310, Volume 1, chapter 5, 5-3.21
Inspection of igniters I.A.W. GEK 97310, Volume 1, chapter 5, 5-3.23.
Summary of Overall Condition:
481-743 was found to be UNSERVICEABLE
• HPC: Blades viewed in dirty condition. Serviceable
• Combustor: Normal discoloration. Serviceable
• Stage 1 HPT: Unserviceable damage found to HPT stage 1 blades beyond limits
of GEK 97310 Volume 1 Chapter 5, Table 5-8 Item 3e. 5 HPTN1 nozzle
segments found with serviceable T/E cracks. One HPTN1 nozzle found with
trailing edge erosion and crack- Unserviceable.
• Stage 2 HPT: Unserviceable damage found to Stage 2 HPT blades- 3 blades
found with leading edge holes, 2 blades found with L/E tip tears- unserviceable
IAW 97310 Volume 1, Chapter 5 Table 5-8 Items 2a and b.
• TMF: Strut crack found within serviceable limits.
• LPT: No discrepancies
The borescope inspection was completed with the below recommendations:
UC Davis Borescope Inspection 481-743
Page 3
Recommendations:
• It is recommended to send 481-743 to depot for repairs to damaged hot section components
prior to further operation.
• It is also recommended to perform a compressor water wash to maintain compressor efficiency
and power.
• It is recommended to repair TMF strut crack at time of hot section repair.
UC Davis Borescope Inspection 481-743
Page 4
High Pressure Compressor:
High Pressure Compressor Comments:
Rotor Blades Blades viewed in dirty condition. Serviceable
Stage 1 Blade Mid-Spans No discrepancies
Stage 1&2 Blade Retainers No discrepancies
HPC Rotor Weep Holes No discrepancies
IGV & Stator Vanes No discrepancies
IGV, 1 & 2 VSV Shrouds No discrepancies
Rotor Spool Rub Coat No discrepancies
Additional Comments No further comment
UC Davis Borescope Inspection 481-743
Page 5
HPC Stage 1 L/E Tip HPC Stage 1 Root
HPC Stage 1 Carboloy wear pads HPC Stage 1 Carboloy wear pads
HPC Stage 1 Blade retainers HPC Stage 1 Blade retainers
UC Davis Borescope Inspection 481-743
Page 6
HPC Stage 2 L/E Blades HPC Stage 2 T/E Blades
HPC Stage 3 L/E Blades HPC Stage 3 L/E Blades
HPC Stage 4 L/E Blades HPC Stage 4 L/E Blades
UC Davis Borescope Inspection 481-743
Page 7
HPC Stage 5 L/E Blades HPC Stage 5 T/E Blades
HPC Stage 6 L/E Blades HPC Stage 6 T/E Blades
HPC Stage 9 L/E Blades HPC Stage 9 T/E Blades
UC Davis Borescope Inspection 481-743
Page 8
HPC Stage 10 L/E Blades HPC Stage 10 T/E Blades
HPC Stage 11 Blades HPC Stage 12 Blades
HPC Stage 15 Blades HPC Stage 16 Blades
UC Davis Borescope Inspection 481-743
Page 9
Combustor:
Combustor Comments:
All Surfaces Normal discoloration. Serviceable
Cowl Normal discoloration. Serviceable
Dome Assembly Normal discoloration. Serviceable
Primary & Secondary Swirlers Minor TBC loss normal discoloration. Serviceable
Inner & Outer Liner Normal discoloration. Serviceable
Fuel Nozzles Not removed per customer request.
Igniters No discrepancies
Additional Comments No further comment
UC Davis Borescope Inspection 481-743
Page 10
Combustor Overview Combustor Dome Assembly
Primary and secondary swirler Combustor Dome Band
Combustor Outer Liner Combustor Inner Liner
UC Davis Borescope Inspection 481-743
Page 11
Combustor Splash Plates Combustor Splash Plates
Combustor Splash Plates Combustor Splash Plates
Upper Igniter Lower Igniter
UC Davis Borescope Inspection 481-743
Page 12
High Pressure Turbine:
High Pressure Turbine Comments:
HPT Stage 1 Nozzles Trailing edge impacts and missing material. Unserviceable
HPT Stage 1 Shrouds Tip Rub- serviceable
HPT Stage 1 Rotor Blades Impact with missing material. Unserviceable
HPT Stage 2 Nozzles Minor serviceable impacts throughout
HPT Stage 2 Shrouds Impacts on shrouds- within serviceable limits.
HPT Stage 2 Rotor Blades Leading edge impacts/ holes/ tip tears. Unserviceable
Additional Comments Recommend HPT repair prior to further operation.
UC Davis Borescope Inspection 481-743
Page 13
HPTN1 L/E HPTN1 L/E
HPTN1 T/E impact HPTN1 T/E impact and missing material.
HPT Stage 1 L/E Tip HPT Stage 1 L/E Root
UC Davis Borescope Inspection 481-743
Page 14
HPT Stage 1 L/E Tip HPT Stage 1 L/E Root
HPT Stage 1 Blades shroud and blade Impact. HPT Stage 2 Blades shroud impact.
HPT Stage 2 L/E impact T/E nozzle impact. HPT Stage 2 L/E impact.
UC Davis Borescope Inspection 481-743
Page 15
HPT Stage 2 L/E impact. HPT Stage 2 L/E impact and cracked.
HPT Stage 2 L/E impact. HPT Stage 2 L/E impact.
HPT Stage 2 L/E Tip crack. HPT Stage 2 L/E Tip crack.
UC Davis Borescope Inspection 481-743
Page 16
Turbine Mid Frame:
Turbine Mid Frame Comments:
Inner Liner (shifting, cracks) No discrepancies
Casing (outer liner) welds No discrepancies
T5.4 bosses No discrepancies
C-Sump Housing No discrepancies
Struts & End caps Strut crack found to be within serviceable limits (est .250”)
T5.4 Probes No discrepancies
P5.4 Probe No discrepancies
S1 LPT Nozzle Support No discrepancies
Additional Comments It is recommended to repair TMF strut crack at time of engine
repair.
UC Davis Borescope Inspection 481-743
Page 17
TMF Strut minor crack. TMF Strut minor crack.
TMF Outer Liner T5.4 Thermocouple
T5.4 Thermocouple T5.4 Thermocouple
UC Davis Borescope Inspection 481-743
Page 18
Power Turbine:
Power Turbine Comments:
Stage 1 Nozzle Vanes No discrepancies
Stage 1 LPT Shrouds LPT Stage 1 Blades Shroud impact- serviceable.
Stg 1 & 6 Rotor Blades No discrepancies
Case No discrepancies
Turbine Rear Frame No discrepancies
D-Sump Manifold No discrepancies
Additional Comments No further comment
UC Davis Borescope Inspection 481-743
Page 19
LPT Stage 1 Blades L/E Tip LPT Stage 1 Blades L/E Root
LPT Stage 1 Blades L/E Tip LPT Stage 1 Blades L/E Root
LPT Stage 1 Blades Shroud impact. LPT Stage 1 Blades Shroud impact.
UC Davis Borescope Inspection 481-743
Page 20
Lube and Scavenge Finger Screens and Chip Detectors:
Chip Detector and Finger Screen as Found Condition
Location Chip Detector Finger Screen
TGB/A Scavenge Not Equipped No discrepancies
A Scavenge Not Equipped No discrepancies
B Scavenge Not Equipped No discrepancies
C Scavenge Not Equipped No discrepancies
D Scavenge Not Equipped No discrepancies
Lube Inlet Not Equipped No discrepancies
Lube & Scavenge Finger Screens Lube & Scavenge Finger Screens
Lube & Scavenge Finger Screens Lube & Scavenge Finger Screens
Recommended