EASA SIB 2019-13: Controller Pilot Data Link Communications over Very High Frequency Data Link Mode 2 — Airborne Multi-Frequency Capability

What to do

Operators should verify that their aircraft are equipped with autotune/multi-frequency capable VDL Mode 2 systems and upgrade those that are not to achieve compliance with Commission Regulations. Those using CPDLC or other data transmissions over VDL Mode 2 are strongly encouraged to ensure their systems support multi-frequency capability. No specific compliance deadlines are stated, but prompt upgrades are highly recommended.

Summary

EASA Safety Information Bulletin 2019-13 is an informational bulletin addressing the requirement for airborne multi-frequency capability in Controller Pilot Data Link Communications (CPDLC) over Very High Frequency Data Link Mode 2 (VDL Mode 2) systems. It applies to operators of aircraft equipped with VDL Mode 2 datalink installations operating within Single European Sky airspace. The bulletin emphasizes the need for automatic tuning (autotune) capability to support effective communication and compliance with relevant Commission Regulations.

What changed

This bulletin highlights the requirement for multi-frequency autotune capability in airborne VDL Mode 2 systems to ensure seamless frequency switching and maintain data link service quality. It clarifies that aircraft lacking this capability negatively impact network performance and capacity. Although no mandatory directives are issued, the bulletin recommends operators verify and upgrade their systems to comply with existing regulations.

Why it matters

For aviation professionals, ensuring multi-frequency capability in VDL Mode 2 systems is crucial to maintain efficient CPDLC communications and avoid operational disruptions. Operators without autotune-capable systems risk non-compliance with Commission Regulations and may degrade the overall performance of air-ground data link networks. Maintenance and compliance teams must be aware of these requirements to support regulatory adherence and operational safety.