During ground starts on the B737-800, what does the EEC monitor?

During ground starts on the B737-800, what does the EEC monitor?

• A. Impending hot starts and wet starts
• B. Engine oil pressure
• C. Fuel temperature
• D. Cabin pressure

Answer: (D)

During ground starts, the Electronic Engine Control watches how the start is proceeding and compares sensor readings to safe-start limits. It uses fuel metering, the throttle schedule, and readings such as exhaust gas temperature, engine speeds (N1/N2), and oil pressure to determine if the start is progressing normally. If the EGT rises too quickly for the observed speed (a hot start) or if fuel is delivered when there isn’t enough air (a wet start), the EEC will terminate the fuel flow to protect the engine. Cabin pressure, on the other hand, is managed by the environmental control system and is monitored by different sensors, not the engine’s EEC. So the EEC’s monitoring during a ground start is focused on preventing abnormal engine starts, not on cabin environmental conditions.

During ground starts, the Electronic Engine Control watches how the start is proceeding and compares sensor readings to safe-start limits. It uses fuel metering, the throttle schedule, and readings such as exhaust gas temperature, engine speeds (N1/N2), and oil pressure to determine if the start is progressing normally. If the EGT rises too quickly for the observed speed (a hot start) or if fuel is delivered when there isn’t enough air (a wet start), the EEC will terminate the fuel flow to protect the engine. Cabin pressure, on the other hand, is managed by the environmental control system and is monitored by different sensors, not the engine’s EEC. So the EEC’s monitoring during a ground start is focused on preventing abnormal engine starts, not on cabin environmental conditions.