Which statement describes what triggers the hydraulic pump in the Seminole gear system?

• A. The gear switch is moved to UP drives the hydraulic pump
• B. The hydraulic reservoir pressure exceeds limit
• C. The landing gear doors open
• D. Gear switch UP triggers the hydraulic pump to begin pushing high-pressure fluid through the high-pressure side, into the actuator

Answer: (D)

The essential idea is that moving the gear handle to UP energizes the hydraulic pump, and that pump sends high-pressure fluid to the actuator to retract the landing gear. When the gear switch is in UP, the pump begins pushing hydraulic fluid through the high-pressure line into the actuator that drives the gear to retract. This describes both what starts the action (the UP switch) and the path the fluid takes (high-pressure side to the actuator).

The other possibilities don’t describe the trigger correctly: pressure exceeding a limit would typically trigger a relief condition rather than energize the pump, and simply opening the gear doors is a result of the gear moving, not the trigger for the pump.