Operational Resilience Data Platform.

Diagnostic Summary: Another plausible cause is unstable airflow into the combustor, such as compressor discharge pressure problems, inlet restriction, VIGV mispositioning, or excessive bleed air. If the compressor air supply is unstable, turbine inlet temperature can swing in both directions as the fuel-air ratio changes. That would explain why the same temperature signal kept tripping both the high and low rules instead of settling into one clear state.

The combustion chamber pressure anomaly later in the morning also fits an air-side disturbance. A compressor or inlet problem can change chamber pressure and combustion quality at the same time. The long low-temperature period from roughly midday into the evening could reflect reduced airflow or load changes that kept combustion cooler, while the shorter high-temperature bursts could be transient recoveries or control corrections.