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 Incident: Frontier A321 at Nashville on Feb 15th 2021, flight attendant prevents takeoff with contaminated wings

A Frontier Airlines Airbus A321-200, registration N710FR performing flight F9-7011 from Nashville,TN to Las Vegas,NV (USA), was taxiing for departure when tower informed the crew braking action was reported good by the last aircraft, tower hoped that information was still good. The aircraft subsequently was cleared for takeoff from Nashville's runway 02L when the crew queried whether there was any traffic. Tower assured no traffic on approach or waiting for departure, tower instructed to advise when they were rolling. About three minutes later the crew indicated they needed to return to the gate due to their left wing not being de-iced. Tower cancelled the takeoff clearance, the aircraft taxied back to the apron.

In a memorandum to Air Safety Organizsations as well as ALPA, that was leaked to the Internet on Mar 2nd 2021, the airline reported:

Greetings Air Safety Organization and ALPA Safety Council,

Earlier this week during the massive snowstorm throughout the Central and Eastern States, we had a DEICE incident that could have led to a catastrophic outcome.

We (FFT) had an aircraft request and receive type 1 and type 4 deicing. The Vendor (Trego Dugan) stated to our flight deck crew that the aircraft was deiced and clear of contaminants.

Upon reaching the runway, and preparing for departure, an alarmed flight attendant called the flight deck stating that the wings were covered with snow and ice still. The flight crew visually inspected and returned to the gate. Both wings had about a foot of snow and ice still covering the wings with some fluid sprayed throughout the wing area. We found out the vendor was running low on fluid. They have since been terminated from our operations.

We are letting everyone know, as a safety precaution, about our experience with Trego Dugan Deice in BNA.

The airline confirmed the authenticity of that message. In the following The Aviation Herald checked all Frontier departures back from Mar 2nd 2021 until the flight was found on Feb 15th 2021 and could be verified via ATC recordings.