What does the alternate static source switch provide an alternate source of static pressure to?

• A. ADC/ADU 1
• B. ADC/ADU 2
• C. AHRS 1
• D. AHRS 2

Answer: (B)

The alternate static source switch is designed to provide an alternative source of static pressure, primarily to the air data computer or air data unit 2. This capability is essential for maintaining accurate altitude and airspeed readings, especially in situations where the primary static source may be compromised, such as during system malfunctions or blockage.

When the switch is activated, it redirects the static pressure input to the alternate source connected to ADC/ADU 2. This feature assures redundancy in the aircraft's systems, enhancing safety by ensuring that reliable data can still be retrieved, thereby allowing pilots to maintain situational awareness and make informed decisions during flight.

Other options pertain to different components within the aircraft's avionics and navigation systems, but the alternate static source switch specifically aims to support ADC/ADU 2 for static pressure, making it a crucial component in the context of system reliability and redundancy.