CPDLC stands for Controller-Pilot Data Link Communications and reduces voice workload by using what?

• A. Voice-only transmissions for all clearances.
• B. Email-style attachments for weather data.
• C. Shortcoded radio signals.
• D. Text messages to convey clearances and instructions.

Answer: (D)

CPDLC reduces voice workload by exchanging text messages rather than spoken transmissions. This data-link approach lets controllers send clearances and instructions—such as altitude changes, route modifications, speed restrictions, and hold entries—through concise, standardized text messages that the pilot reads and responds to with predefined replies. The benefits are clear: less radio chatter frees up the frequency for critical communications, messages are less prone to mishearing or misinterpretation due to accents or noisy environments, and communications are time-stamped and logged for accuracy. In contrast, using voice or other non-text methods would maintain or increase voice workload and introduce more potential for miscommunication.