What happens if hydraulic pressure to the nose wheel steering is lost?

What happens if hydraulic pressure to the nose wheel steering is lost?

• A. Emergency accumulator provides steering authority
• B. PTCU provides steering authority
• C. Landing gear hydraulics provide steering authority
• D. Manual control is required for steering

Answer: (A)

The system tests your understanding of a backup source for nose wheel control. Nose wheel steering is normally powered by the aircraft’s hydraulic system, but if that pressure is lost, a dedicated emergency accumulator stores hydraulic energy to keep the nose wheel actuators working for a limited time. This provides essential steering authority for safe taxi, and a controlled approach and landing, even with primary hydraulic pressure unavailable. The other options aren’t the source of steering power in a hydraulic loss scenario: the PTCU isn’t the steering source, landing gear hydraulics won’t have pressure to drive steering, and manual control by itself isn’t the activated backup path for nose wheel steering during an hydraulic failure.

The system tests your understanding of a backup source for nose wheel control. Nose wheel steering is normally powered by the aircraft’s hydraulic system, but if that pressure is lost, a dedicated emergency accumulator stores hydraulic energy to keep the nose wheel actuators working for a limited time. This provides essential steering authority for safe taxi, and a controlled approach and landing, even with primary hydraulic pressure unavailable. The other options aren’t the source of steering power in a hydraulic loss scenario: the PTCU isn’t the steering source, landing gear hydraulics won’t have pressure to drive steering, and manual control by itself isn’t the activated backup path for nose wheel steering during an hydraulic failure.