In flight, if primary flight display data seem unreliable, what is a prudent action?

In flight, if primary flight display data seem unreliable, what is a prudent action?

• A. Rely exclusively on the PFD/MFD.
• B. Cross-check with standby instruments to verify attitude, airspeed, and altitude.
• C. Ignore until landing.
• D. Drop altitude until readings stabilize.

Answer: (B)

When the primary flight display data seem unreliable, the prudent action is to rely on the standby instruments to verify attitude, airspeed, and altitude. Standby instruments are designed to remain functional when the PFD has trouble because they typically have a separate power source and are not dependent on the same data bus. Use the standby attitude indicator to keep the wings level and maintain the desired pitch, the standby airspeed indicator to control your speed, and the standby altimeter to maintain your assigned altitude. Keep scanning and cross-checking the readings, and treat the standby indications as the primary reference until the PFD issue is resolved or you transition to a safe landing. Relying solely on the PFD, ignoring the standby instruments, or making abrupt changes without reference to the backup indicators could lead to loss of control or an unsafe flight.

When the primary flight display data seem unreliable, the prudent action is to rely on the standby instruments to verify attitude, airspeed, and altitude. Standby instruments are designed to remain functional when the PFD has trouble because they typically have a separate power source and are not dependent on the same data bus. Use the standby attitude indicator to keep the wings level and maintain the desired pitch, the standby airspeed indicator to control your speed, and the standby altimeter to maintain your assigned altitude. Keep scanning and cross-checking the readings, and treat the standby indications as the primary reference until the PFD issue is resolved or you transition to a safe landing. Relying solely on the PFD, ignoring the standby instruments, or making abrupt changes without reference to the backup indicators could lead to loss of control or an unsafe flight.