BUILDING DAMAGED AND OBSERVERS INJURED AFTER SUFFERING FROM JET BLAST ENCOUNTER PRODUCED BY DEPARTING ACR LGT IN RAMP OP ACFT DEP PROC.

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CAPT AND I INSPECTED THE CONDITION OF THE RAMP ON THE WAY FROM OPS TO ACFT -- APPROX 1/2 TO 1 INCH OF RELATIVELY DRY FRESH POWDER WAS ON THE RAMP; NO SNOW UNDER THE ACFT; AND SMALL AMOUNTS ON THE ACFT. IT APPEARED NO PORTION OF THE ARPT HAD BEEN PLOWED SINCE THE PREVIOUS DAY. DEICING AND CLUTTER DATA WAS COORDINATED WITH GND PERSONNEL. AFTER THE PAX BOARDED; WE BUTTONED UP AND DEICING OF THE ENTIRE ACFT WAS ACCOMPLISHED. 3 ENGS WERE STARTED. THE CREW DISCUSSED TIGHT TURN AND POSSIBLE TAXI HAZARDS. CAPT BRIEFED ME TO MONITOR THE PWR. WHEN TAXI CLRNC WAS REQUESTED; WE WERE TOLD TO HOLD FOR OTHER ACR MDT AT OUR 2 O'CLOCK POS; WHO HAD JUST LANDED AND WAS TAXIING AROUND BEHIND US TO PARK ON OUR L. WHEN CLRED TO TAXI TO RWY 30; THE COPLT MONITORED THE RAMP SPACE REMAINING TO THE R; AND THE CAPT MONITORED THE NOSE WHEEL REFLECTION OFF THE TERMINAL WINDOW AHEAD OF US. THE CAPT PUSHED 3 THROTTLES UP SLOWLY UNTIL THE FANS KICKED IN AND THE ACFT STARTED TO MOVE. THEN THE CAPT FIRMLY TURNED THE NOSE WHEEL STEERING FULL R. IT WAS IMMEDIATELY OBVIOUS THE ACFT WAS SLIDING/SKIDDING; AND THE NOSE WHEEL STEERING WAS COMPLETELY INEFFECTIVE. WE WERE SLIDING STRAIGHT AHEAD TOWARDS THE TERMINAL BUILDING. THE CAPT PULLED #2 AND #3 BACK TO IDLE; AND LEFT #1 AT 1.15 TO 1.2 EPR; AND BRAKED DIFFERENTIALLY TO TRY TO GET THE NOSE TO COME AROUND TO THE R TO AVOID THE TERMINAL IF WE DIDN'T STOP. MARSHALLERS WERE INITIALLY SIGNALING STOP WHEN THEY REALIZED WE WERE SKIDDING; THEN SIGNALED HARD R TURN. THE ACFT FINALLY ANSWERED THE CAPT'S INPUTS AND CAME AROUND TO THE R AND THEN THE CAPT REDUCED #1 TO IDLE. THE TURN REQUIRED WAS APPROX 225 DEGS. SOMEONE (WE BELIEVE IT WAS ONE OF THE MDT PLTS) MADE A RADIO CALL ABOUT; 'WATCHING PWR.' WHEN THE TWR CLRED US FOR TKOF THEY ADVISED US TO CONTACT OUR LCL COMPANY FREQ. THE COMPANY ADVISED US WE HAD BLOWN OUT A WINDOW IN THE TERMINAL; AND 1 EMPLOYEE AND A WIFE OF ONE OF OUR PAX HAD BEEN INJURED BY FLYING GLASS; CAUSED BY JET BLAST. COMMENTS: TUG IS NEEDED FOR PUSHBACK UNDER SLIPPERY CONDITIONS. SUSPECT THE DEICING FLUID MAY HAVE TURNED WHAT APPEARED TO BE A SAFE RAMP CONDITION PRIOR TO DEP INTO UNSAFE RAMP CONDITIONS AT DEP.