Which function of the DEC/EDECU is available when in DEC/EDECU Lockout?

• A. NP Overspeed Protection
• B. Engine Oil Level Monitoring
• C. Electrical Load Shedding
• D. Fuel Flow Control

Answer: (A)

When the DEC/EDECU is in lockout, normal engine control functions are disabled, but essential safety protections remain active. The Np overspeed protection is designed as a fail-safe that will trip or limit power if the propeller speed exceeds safe limits, using a hardware path that does not rely on active DEC/EDECU processing. This makes it available even during lockout. The other functions rely on active DEC/EDECU processing and sensor data: engine oil level monitoring needs oil sensors interpreted by the controller, electrical load shedding requires coordinated DEC/EDECU management, and fuel flow control is the primary function of the EDECU and isn’t available when the unit is locked out.