What role do instrumentation readings such as RPM, ITT/EGT play in control?

• A. They indicate engine health and guide control to keep RPM within limits and temperatures safe
• B. They control fuel pump speed
• C. They are not used during operation
• D. They only indicate speed

Answer: (A)

RPM and ITT/EGT readings provide essential feedback for the engine’s control system. RPM shows how fast the shaft is turning, while ITT/EGT reveals the thermal load the engine is handling. The control system uses these values to keep the engine at the desired speed and to prevent overheating, adjusting fuel flow and air supply as needed to stay within safe limits. They also serve as health indicators; abnormal readings can trigger alarms or protections. In operation, these measurements are actively used to shape how the engine responds to throttle and load, rather than being mere indicators.