If there is an engine driven hydraulic pump problem (1A or 2A), is the associated engine required to be shutdown?

If there is an engine driven hydraulic pump problem (1A or 2A), is the associated engine required to be shutdown?

• A. No. A shutoff valve has been positioned between the pump and the reservoir to isolate the pump from the system
• B. Yes, the engine must be shutdown
• C. It depends on the flight phase
• D. Only if the reservoir is low

Answer: (A)

When an engine-driven hydraulic pump has a problem, you can isolate the pump from the hydraulic system using a shutoff valve placed between the pump and the reservoir. This allows you to stop the pump’s flow without shutting down the engine, so the engine can keep running and other hydraulic routes remain available if needed. The existence of that isolation valve means there’s no requirement to shutdown the associated engine solely due to a pump issue. The need to shut down would only come into play if isolation wasn’t possible or if the problem required disconnection from the engine for safety, which isn’t indicated here. The phase of flight or whether the reservoir is low doesn’t change the fact that the valve can isolate the pump, so neither of those conditions dictates engine shutdown.

When an engine-driven hydraulic pump has a problem, you can isolate the pump from the hydraulic system using a shutoff valve placed between the pump and the reservoir. This allows you to stop the pump’s flow without shutting down the engine, so the engine can keep running and other hydraulic routes remain available if needed. The existence of that isolation valve means there’s no requirement to shutdown the associated engine solely due to a pump issue. The need to shut down would only come into play if isolation wasn’t possible or if the problem required disconnection from the engine for safety, which isn’t indicated here. The phase of flight or whether the reservoir is low doesn’t change the fact that the valve can isolate the pump, so neither of those conditions dictates engine shutdown.