Operating thrust reversers at low ground speeds can sometimes cause:

Operating thrust reversers at low ground speeds can sometimes cause:

• A. Abnormal exhaust gas temperature and engine pressure ratio indications
• B. Engine vibrations
• C. Hot gas re-ingestion, compressor stalls, and sand or other foreign object ingestion
• D. No abnormal effects

Answer: (C)

When thrust reversers are used at low ground speeds, the forward-directed jet and altered airflow around the engine can pull hot exhaust back toward the inlet and suck up debris from the runway. This hot gas re-ingestion heats the compressor inlet and disrupts stable airflow, which can lead to compressor stalls or surges. The reversed flow can also carry sand or other foreign objects into the engine, causing FOD-related damage and instability. Because of these risks, reversing thrust on the ground at very low speeds is a dangerous combination, making hot gas re-ingestion, compressor stalls, and debris ingestion the likely consequences.

When thrust reversers are used at low ground speeds, the forward-directed jet and altered airflow around the engine can pull hot exhaust back toward the inlet and suck up debris from the runway. This hot gas re-ingestion heats the compressor inlet and disrupts stable airflow, which can lead to compressor stalls or surges. The reversed flow can also carry sand or other foreign objects into the engine, causing FOD-related damage and instability. Because of these risks, reversing thrust on the ground at very low speeds is a dangerous combination, making hot gas re-ingestion, compressor stalls, and debris ingestion the likely consequences.