What is the difference between a CVR and an FDR and what data do they capture?

What is the difference between a CVR and an FDR and what data do they capture?

• A. CVR records cockpit audio; FDR records flight parameters (speed, altitude, attitude, etc.) for accident investigations.
• B. CVR records flight data; FDR records cockpit audio.
• C. CVR records weather data; FDR records cabin conditions.
• D. CVR records passenger conversations only.

Answer: (A)

The key idea is that the two recorders capture fundamentally different kinds of data to support understanding what happened during flight. A cockpit voice recorder collects audio from the cockpit—speaking between crew members and any ambient cockpit sounds—so investigators can hear communications and sounds that accompany events. A flight data recorder, on the other hand, continuously logs numerical flight parameters from sensors across the airplane—things like airspeed, altitude, vertical speed, attitude (pitch and roll), heading, and various engine and system measurements—providing a precise record of the aircraft’s performance and trajectory over time. This combination lets investigators correlate what was said and heard in the cockpit with exactly how the aircraft was flying at each moment. The option that aligns with this distinction says the CVR records cockpit audio and the FDR records flight parameters for accident investigations, which is the best description. Why the other statements don’t fit: recording weather data or cabin conditions isn’t the primary role of the CVR, and recording cabin or passenger conversations alone misses the cockpit-focused audio and the broader flight data the FDR captures; likewise, stating the CVR records flight data or that the FDR records cockpit audio swaps their roles.

The key idea is that the two recorders capture fundamentally different kinds of data to support understanding what happened during flight. A cockpit voice recorder collects audio from the cockpit—speaking between crew members and any ambient cockpit sounds—so investigators can hear communications and sounds that accompany events. A flight data recorder, on the other hand, continuously logs numerical flight parameters from sensors across the airplane—things like airspeed, altitude, vertical speed, attitude (pitch and roll), heading, and various engine and system measurements—providing a precise record of the aircraft’s performance and trajectory over time.

This combination lets investigators correlate what was said and heard in the cockpit with exactly how the aircraft was flying at each moment. The option that aligns with this distinction says the CVR records cockpit audio and the FDR records flight parameters for accident investigations, which is the best description.

Why the other statements don’t fit: recording weather data or cabin conditions isn’t the primary role of the CVR, and recording cabin or passenger conversations alone misses the cockpit-focused audio and the broader flight data the FDR captures; likewise, stating the CVR records flight data or that the FDR records cockpit audio swaps their roles.