Each main hydraulic system has an engine driven pump and an electric pump.

Question

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Statement under review: 'Each main hydraulic system has an engine driven pump and an electric pump.'

Option 1: True
- This assertion aligns with the common configuration of many aircraft hydraulic systems, where a primary engine-driven pump provides normal pressure and an electric pump serves as a backup or for system redundancy. The engine-driven pump is powered during engine operation, delivering high-pressure hydraulic fluid, while the electric pump can be used when engine power is unavailable or to back up the system, ensuring continued hydraulic operation.
- In practice, you’ll often see at least one engine-driven pump (EDP) connected to each main hydraulic system, complemented by an electric (or motor-driven) pump for redundancy and to handle certain operations (like extending actuators or powering systems when engines are off). This structure enhances reliability and provides alternative hydraulic power paths when needed.
- Therefore, describing the main hydraulic system as having both an engine-driven pump and an electric pump captures the standard architecture described above.

Option 2: False
- This option would be incorrect if interpreted as a universal rule that all main hydraulic systems must have exactly both an engine-driven pump and an electric pump in every configuration. Some systems might rely on a different backup arrangement or may not include an electric pump in certain designs, depending on the aircraft and system architecture.
- The potential misconception here is assuming uniformity across all aircraft designs; variations exist where the backup may be a different kind of pump, or where engine-driven pumps suffice for certain modalities without an electric counterpart.
- Hence, labeling the statement as false would ignore the conventional, widely-used configuration described in many aircraft hydraulic manuals, making it an incomplete or inaccurate generalization.

AS 411 Exam 03

Each main hydraulic system has an engine driven pump and an electric pump.

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