What color is the vertical speed indicator arc on the PFD during an RA?

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Multiple Choice

What color is the vertical speed indicator arc on the PFD during an RA?

During a Resolution Advisory, the vertical speed indicator arc on the PFD is green to show that the recommended vertical speed is within the normal, safe operating range and the guidance is actively in use. The green color is a quick cue that you should follow the advisories, as they are within the aircraft’s safe performance envelope. Yellow or red would indicate caution or warnings outside the normal operating limits, or conditions requiring extra attention, but in a standard RA the system’s vertical speed cue remains green to signal normal guidance. In practice, this means you can smoothly adjust to the commanded climb or descent without encountering abnormal or unsafe limits.

During a Resolution Advisory, the vertical speed indicator arc on the PFD is green to show that the recommended vertical speed is within the normal, safe operating range and the guidance is actively in use. The green color is a quick cue that you should follow the advisories, as they are within the aircraft’s safe performance envelope. Yellow or red would indicate caution or warnings outside the normal operating limits, or conditions requiring extra attention, but in a standard RA the system’s vertical speed cue remains green to signal normal guidance. In practice, this means you can smoothly adjust to the commanded climb or descent without encountering abnormal or unsafe limits.

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