What should the GPU voltage indicate on the MFD when it is connected and available?

What should the GPU voltage indicate on the MFD when it is connected and available?

• A. 24 VDC to 26 VDC
• B. 26 VDC to 29 VDC
• C. 28 VDC to 32 VDC
• D. 30 VDC to 35 VDC

Answer: (B)

When a GPU is connected and available, the MFD will display the external power voltage coming from the GPU. The aircraft’s electrical system uses a 28 V DC supply, and the voltage from the GPU should read within a normal tolerance around that value. The standard indication you’ll see on the MFD is about 26 to 29 V DC. This range confirms the external power source is healthy and feeding the DC bus properly. Values outside this range would suggest an abnormal condition or a faulty source.

When a GPU is connected and available, the MFD will display the external power voltage coming from the GPU. The aircraft’s electrical system uses a 28 V DC supply, and the voltage from the GPU should read within a normal tolerance around that value. The standard indication you’ll see on the MFD is about 26 to 29 V DC. This range confirms the external power source is healthy and feeding the DC bus properly. Values outside this range would suggest an abnormal condition or a faulty source.