LM2500 BORESCOPE INSPECTION REPORT · 2018-12-08 · UC Davis Borescope Inspection 481-743 Page 3...

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

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:


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.


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


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


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



HPC Stage 11 Blades HPC Stage 12 Blades

HPC Stage 15 Blades HPC Stage 16 Blades


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



Combustor Overview Combustor Dome Assembly

Primary and secondary swirler Combustor Dome Band

Combustor Outer Liner Combustor Inner Liner


Combustor Splash Plates Combustor Splash Plates

Combustor Splash Plates Combustor Splash Plates

Upper Igniter Lower Igniter


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.


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


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.


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.


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.


TMF Strut minor crack. TMF Strut minor crack.

TMF Outer Liner T5.4 Thermocouple

T5.4 Thermocouple T5.4 Thermocouple


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



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.


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

LM2500 BORESCOPE INSPECTION REPORT · 2018-12-08 · UC Davis Borescope Inspection 481-743 Page 3...

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