B737 captain reported that after deicing in freezing drizzle conditions ice was noted on the aircraf...

Attributes
ACN	1416569
Time
Date	201701
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 236 Flight Crew Total 10838 Flight Crew Type 8129
Events
Anomaly	Deviation - Procedural Published Material / Policy Ground Event / Encounter Other / Unknown

Narrative:

We de-iced at the gate. Using the ACARS; snow was indicated at the beginning of deicing. Holdover time 140 minutes with type 4. During process; precipitation changed to fzdz (freezing drizzle); new ACARS showed holdover time the same. Neither of these indicated the need for any type of wing check. When start time was given to us by deicing; precipitation was reported as nil. On taxi out; I noticed a small patch of ice adhering to the nose; just below and down from my wiper. I asked the first officer to perform a wing check (not called for by any ACARS paperwork). He returned reporting a large area of ice on top of the wing aft of engine 2. We coordinated a return to gate for deicing. We received another round of deicing and reinitiated our departure.

Original NASA ASRS Text

Title: B737 Captain reported that after deicing in freezing drizzle conditions ice was noted on the aircraft nose. A wing check revealed the need for additional deicing.

Narrative: We de-iced at the gate. Using the ACARS; snow was indicated at the beginning of deicing. Holdover time 140 minutes with Type 4. During process; precipitation changed to FZDZ (Freezing Drizzle); new ACARS showed holdover time the same. Neither of these indicated the need for any type of wing check. When start time was given to us by deicing; precipitation was reported as nil. On taxi out; I noticed a small patch of ice adhering to the nose; just below and down from my wiper. I asked the First Officer to perform a wing check (not called for by any ACARS paperwork). He returned reporting a large area of ice on top of the wing aft of Engine 2. We coordinated a return to gate for deicing. We received another round of deicing and reinitiated our departure.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

B737 captain reported that after deicing in freezing drizzle conditions ice was noted on the aircraft nose. A wing check revealed the need for additional deicing.