AN AIRBUS TAXIING TO THE RUNWAY WAS CALLED BACK TO THE GATE BECAUSE IT WAS NOT COMPLETELY DE-ICED.

Narrative

REQUESTED TYPES 1 AND 4 DEICING AS ACFT HAD ACCUMULATED PRECIP AND SNOW WAS FALLING. DEICE CREW AT REMOTE PAD GAVE REQUIRED INFO AT 'COMPLETION' AND HANDED US OFF TO PAD CTL FOR TAXI. APPROX 12 MINS LATER WE WERE WITHIN 5 MIN WINDOW OF FLT AND FO PERFORMED INSPECTION OF WING. RPT WAS THAT WINGS WERE CLR. SHORTLY THEREAFTER; THE TWR FORWARDED A MESSAGE TO CALL OPS. OPS ADVISED A RETURN TO DEICE PAD AS THE JOB WAS NOT PROPERLY COMPLETED. I SHUT DOWN ENGS AT PAD AND PERSONALLY OBSERVED THE WINGS AS FOLLOWS: L WING COATED WITH TYPE 4 AND CLEAN; R WING LIGHTLY CONTAMINATED WITH NO TRACE OF TYPE 4. WE WERE SUBSEQUENTLY PROPERLY DEICED; INSPECTED; AND THE FLT CONTINUED NORMALLY. HUMAN FACTORS: WHILE THE DEICE CREW CLEARLY OMITTED DEICING THE R WING; THEY HAD THE INTEGRITY TO CALL ATTN TO THE OVERSIGHT AND RECALL US TO THE PAD. FOR THIS; I AM GRATEFUL AND SINCERELY HOPE ANY ACTION TAKEN WILL BE MODERATED BY THEIR ULTIMATE RESPECT FOR SAFETY. THE NIGHTTIME VIEW OF THE WING FROM THE CABIN IN TIME OF PRECIP IS DIFFICULT. I DEBRIEFED THE FO AND AM CONFIDENT HE WILL BE MORE OBSERVANT.