B737 flight crew reported encountering nil braking action on taxi out that resulted in a taxiway exc...

Attributes
ACN	1322444
Time
Date	201601
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
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	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 167 Flight Crew Type 2590
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 187 Flight Crew Total 4454 Flight Crew Type 2526
Events
Anomaly	Ground Event / Encounter Loss Of Aircraft Control Ground Excursion Taxiway

Narrative:

While taxiing to runway we encountered a sheet of ice and I lost control of the aircraft. I had the brakes applied and #2 thrust reverser deployed (#1 thrust reverser was MEL'd). The taxiway sloped downward and the aircraft exited the taxiway and came to rest in the snow. Airport subsequently closed due to the nil braking and the other aircraft behind us was towed back to the gate.

Original NASA ASRS Text

Title: B737 flight crew reported encountering nil braking action on taxi out that resulted in a taxiway excursion.

Narrative: While taxiing to runway we encountered a sheet of ice and I lost control of the aircraft. I had the brakes applied and #2 thrust reverser deployed (#1 thrust reverser was MEL'd). The taxiway sloped downward and the aircraft exited the taxiway and came to rest in the snow. Airport subsequently closed due to the nil braking and the other aircraft behind us was towed back to the gate.

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.