Successful CPDLC Modification Installed on Boeing 737-800

STC Twenty One Ltd is proud to announce this week that we have finished the certification for two Boeing 737 -800 aircraft to install and activate a CPDLC modification.

CPDLC is a two-way data-link system in which controllers can transmit non-urgent strategic messages to an aircraft as an alternative to voice communications.

The message is displayed on a flight deck visual display. The CPDLC application provides air-ground data communication for the ATC service.

This area of aircraft modification is just one of the many types of design changes we can offer. Why not contact us today on, find us at just search for ‘STC 21’ or simply click the link below and fill out one of our contact forms.