CE560XL flight crew taxiing for takeoff encountered black ice and departed the ramp. Lack of sand tr...

Narrative:

While taxiing from the FBO to the parallel taxiway for runway 20; the aircraft came in contact with severe black ice just prior to the taxiway. The plane began to slide to the right; and brakes from either seat were completely ineffective. The aircraft slid off the ramp onto a snowy area just prior to the taxiway. We immediately shut down the aircraft engines and contacted ATC; advising them of our situation. Our taxi speed prior to the skid was much slower than normal. No reports of black ice were reported on the NOTAMS or over the radios. The aircraft appears to have no damage but has yet to be towed; awaiting [company] maintenance personnel to arrive.the situation would have been avoided if a thorough inspection of the ramp had been made or reports of black ice were relayed to us prior to taxi.

Original NASA ASRS Text

Title: CE560XL flight crew taxiing for takeoff encountered black ice and departed the Ramp. Lack of sand treatment in the Ramp area was cited as a contributing factor.

Narrative: While taxiing from the FBO to the parallel taxiway for Runway 20; the aircraft came in contact with severe black ice just prior to the taxiway. The plane began to slide to the right; and brakes from either seat were completely ineffective. The aircraft slid off the ramp onto a snowy area just prior to the taxiway. We immediately shut down the aircraft engines and contacted ATC; advising them of our situation. Our taxi speed prior to the skid was much slower than normal. No reports of black ice were reported on the NOTAMS or over the radios. The aircraft appears to have no damage but has yet to be towed; awaiting [company] maintenance personnel to arrive.The situation would have been avoided if a thorough inspection of the ramp had been made or reports of black ice were relayed to us prior to taxi.

Data retrieved from NASA's ASRS site as of July 2013 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	1063393
Time
Date	201301
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Dawn
Aircraft 1
Make Model Name	Citation Excel (C560XL)
Operating Under FAR Part	Part 91
Flight Phase	Taxi
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Ground Event / Encounter Loss Of Aircraft Control Ground Excursion Ramp

CE560XL flight crew taxiing for takeoff encountered black ice and departed the ramp. Lack of sand treatment in the ramp area was cited as a contributing factor.