This fourth issue contains among others:

• Feedback article from the SENS4ICE Icing Wind Tunnel tests campaign, including two combined interviews with Collins Aerospace and Technische Universität Braunschweig, for the IWT operators point of view, as well as with Honeywell and DLR for the sensor developers perspective.
• Article about the main work performed, challenges and results achieved within the task "Remote detection of icing conditions", successfully accomplished under CIRA leadership.
• Information on the upcoming SENS4ICE presentation session within the SAE AC-9C Aircraft Icing Technology Committee, which will be held virtually on Thursday 21st of October 2021.

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