When is the BUS TIE switch automatic?

When is the BUS TIE switch automatic?

• A. Only in the air
• B. On the ground and manual in the air
• C. Automatically in both conditions
• D. Only on the ground

Answer: (B)

Understanding the bus tie system is about how power can be shared between two DC busses. When the bus tie is closed, it connects both busses so a single power source can feed both, increasing redundancy and preventing a loss of power to essential systems. On the Longitude, the design uses automatic operation on the ground, so when you’re on the ramp with external power or the APU running, the busses are tied without needing pilot input. In the air, you control the tie manually, so you can decide when to link the busses based on generator status and load conditions. This gives you deliberate control during flight while keeping ground operations streamlined. So the bus tie is automatic on the ground and manual in the air.

Understanding the bus tie system is about how power can be shared between two DC busses. When the bus tie is closed, it connects both busses so a single power source can feed both, increasing redundancy and preventing a loss of power to essential systems.

On the Longitude, the design uses automatic operation on the ground, so when you’re on the ramp with external power or the APU running, the busses are tied without needing pilot input. In the air, you control the tie manually, so you can decide when to link the busses based on generator status and load conditions. This gives you deliberate control during flight while keeping ground operations streamlined.

So the bus tie is automatic on the ground and manual in the air.