CASE STUDIES

TURBINE RUB DAMAGE

Early detection of ITT and N2 trend changes lead to prompt and cost efficient repair with minimum operation disruption.

INTRODUCTION

Following a routine DEEC download, Jet-care issued a warning to an operator.

GAS PATH ANALYSIS

We observed a rapid increase in ITT of almost 60°C and a decrease in N2 of around 3.5% on the #1 Engine over the last four flights of the download data. We strongly recommended that the customer investigated this change as a matter of urgency as this type of trend could indicate genuine engine hot end deterioration.

ACTION/FOLLOW UP

The aircraft was ferried to a maintenance shop for investigation. Turbine entry found High Pressure shroud failure with heavy secondary damage caused by debris.

CONCLUSION:

The operator was provided with the information to enable it to schedule the repair. Without this information the aircraft could easily have become grounded due to performance issues during a scheduled flight, ending in passenger disruption, high costs of shipping and staff movements to replace the engine.

Download the PDF

Turbine Rub Damage [PDF, 147k]

To view PDF files you will require Adobe Reader