What component does the standby hydraulic system power when the ALTERNATE FLAPS master switch is positioned to ARM?

• A. Landing gear
• B. Leading edge flaps and slats
• C. Brake system
• D. Flight control surfaces

Answer: (B)

When the ALTERNATE FLAPS master switch is positioned to ARM in a standby hydraulic system, it specifically powers the leading edge flaps and slats. This functionality is vital for ensuring that the aircraft can still achieve the necessary aerodynamic characteristics during takeoff and landing, even if the primary hydraulic system fails.

In typical operation, the leading edge flaps and slats are crucial for increasing the lift characteristics of the wing at lower speeds, particularly during takeoff and landing phases. By providing power to these components through the standby hydraulic system, pilots can maintain aircraft control and performance, contributing to overall safety during critical phases of flight.

The other components listed—landing gear, brake system, and flight control surfaces—are not powered by the standby hydraulic system when the ALTERNATE FLAPS switch is activated. Each of these systems operates under different hydraulic configurations or may rely on the primary hydraulic system for power, thus clarifying why the focus remains on leading edge flaps and slats in this scenario.