DA42 Phase 2s (Trouble Shooting) includes which action?

• A. Crossfeed fuel
• B. Feather failed engine
• C. Identify failed engine
• D. Power UP

Answer: (A)

In troubleshooting the DA42, the aim is to determine whether a fault is in the fuel system or in an engine and to keep the aircraft controllable while you diagnose. Using the crossfeed option is the most practical tool here because it ties the two fuel systems together, allowing fuel to be drawn from either wing tank for either engine. This lets you test how the engines behave when the opposite tank feeds them, helping you distinguish fuel-supply issues from mechanical problems. If an engine runs normally on crossfeed, the fault is likely fuel-related; if it doesn’t respond, the issue is more likely with that engine itself. This diagnostic step is central to Phase 2 troubleshooting, as it provides actionable information and a path to continued safe flight. Feathers, identifying the failed engine, or powering up are not the primary diagnostic action in this phase.