How does the PTCU function?

How does the PTCU function?

• A. It transfers hydraulic power between A and B without fluid transfer and provides up to 200 A continuously and 250 A intermittently
• B. It pumps hydraulic fluid between A and B
• C. It controls landing gear sequencing
• D. It regulates fuel flow to the engines

Answer: (A)

The essential idea is that the PTCU provides hydraulic power transfer between two independent hydraulic systems rather than moving fluid between them. It uses electrical power to drive a hydraulic pump, enabling one system to be pressurized by the other without a direct fluid path through the unit, and it’s sized to handle up to 200 A continuously and 250 A intermittently, which reflects the electrical current the internal motor/pumps can draw to transfer that power. This makes it a power-sharing device that preserves system separation, rather than a fluid pump, a landing gear sequencer, or a fuel regulator.

The essential idea is that the PTCU provides hydraulic power transfer between two independent hydraulic systems rather than moving fluid between them. It uses electrical power to drive a hydraulic pump, enabling one system to be pressurized by the other without a direct fluid path through the unit, and it’s sized to handle up to 200 A continuously and 250 A intermittently, which reflects the electrical current the internal motor/pumps can draw to transfer that power. This makes it a power-sharing device that preserves system separation, rather than a fluid pump, a landing gear sequencer, or a fuel regulator.