Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Human-Machine Interface; Other / Unknown; Situational Awareness
Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Ground Equipment Issue; Ground Event / Encounter Weather / Turbulence
General Maintenance Action
Human Factors; Weather
I was Check Airman conducting Captain IOE on flight DCA-ZZZ1 . Light Snow Pellets falling at the time with small accumulations observed on aircraft surfaces. Decision made to de-ice type 1 only since we were number one for takeoff and de-ice pad is near departure end of runway 1 at DCA. We received our type 1 application; the Post de-icing report was received; and we taxied out and departed within specified holdover time. Takeoff was uneventful with no abnormalities noted.After landing in ZZZ1 a deadheading [DCA Pilot] based Captain came into the cockpit and presented to me a picture of our left wing immediately following de-icing. This picture showed significant accumulations of ice on the rear of the wing. The discussion we had was that the de-ice crew in DCA did a very cursory job of de-icing the aircraft and merely pushed the sum total of accumulation that was on the wing to the rear of the wing without melting it or pushing it off the wing. This calls into question a number of issues to include the competence and training of the de-ice personnel as well as whether the fluid used was at the correct ratio and temperature. Unfortunately; I do not have a picture of the right wing for comparison purposes.Immediately following this flight and within minutes of being made aware of what occurred; the new Captain and I went to the ZZZ1 Chief Pilots office and met with Chief Pilots [names] so they could communicate to the DCA station to make certain no additional airplanes left that day without being properly de-iced and that I would follow up with a report. [Reporter stated the cause of the incident was] DCA de-ice personnel not properly trained and supervised.More training and oversight of station de-ice personnel.
Captain reported being notified of a 'significant accumulation of ice' remained on left wing after deicing at departure airport.