B767 captain reported that a passenger noticed the aircraft had ice on the trailing edge flaps even ...

Narrative:

[We] followed QRH supplemental cold weather procedures specific to aircraft configuration for ground deicing. Flaps were kept in the up position for taxi out and during ground deicing. Iceman confirmed deicing was complete. Checklist was continued and flaps were lowered to 5 degrees for take-off. Prior to leaving deice pad; flight attendant called to report a passenger observed ice on trailing edge flaps. The ice was hidden while flaps were in the up position. Iceman was called and deice trucks confirmed the ice. Deicing crews cleared the now visible ice. Of note; minimal deicing was required for entire aircraft. Precipitation was minimal during taxi out and during deicing. Only type 1 fluid was required. Temperatures had been in the single digits and teens for the prior 15 hours the aircraft had been parked.

Original NASA ASRS Text

Title: B767 Captain reported that a passenger noticed the aircraft had ice on the trailing edge flaps even after deice procedures were completed.

Narrative: [We] followed QRH supplemental cold weather procedures specific to Aircraft configuration for ground deicing. Flaps were kept in the up position for taxi out and during ground deicing. Iceman confirmed deicing was complete. Checklist was continued and flaps were lowered to 5 degrees for take-off. Prior to leaving deice pad; Flight Attendant called to report a passenger observed ice on trailing edge flaps. The ice was hidden while flaps were in the up position. Iceman was called and deice trucks confirmed the ice. Deicing crews cleared the now visible ice. Of note; minimal deicing was required for entire Aircraft. Precipitation was minimal during taxi out and during deicing. Only Type 1 fluid was required. Temperatures had been in the single digits and teens for the prior 15 hours the Aircraft had been parked.

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.

Attributes
ACN	1509179
Time
Date	201801
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B767 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 220 Flight Crew Total 21000 Flight Crew Type 15000
Events
Anomaly	Deviation - Procedural Published Material / Policy Ground Event / Encounter Other / Unknown

B767 captain reported that a passenger noticed the aircraft had ice on the trailing edge flaps even after deice procedures were completed.