NEAR LOSS OF ACFT CTL ON LNDG PROC ROLLOUT. BRAKING ACTION DIFFERENTIAL REQUIRED.

Narrative

ON FEB/SAT/93 IN ACFT LTT THE CAPT AND MYSELF CONDUCTED A FLT FROM HYA TO BOS. I WAS DESIGNATED FLYING PLT ON THIS LEG. THE FLT WAS NORMAL AND CONDUCTED WITHOUT INCIDENT UNTIL THE LAST PORTION OF THE LNDG ROLL ON RWY 33L IN BOS. UPON THE LNDG ROLLOUT THE ACFT BEGAN TO VIBRATE; SHUDDER; AND DECELERATE ABNORMALLY. AT APPROX 60-40 KTS THE ACFT BEGAN TO VEER TO THE R. ASYMMETRICAL BRAKING AND REVERSE THRUST ON THE L SIDE WAS NECESSARY TO MAINTAIN THE ACFT UNDER CTL AND CLOSE TO THE CTRLINE. OUR PRIMARY CONCERN WAS TO ENSURE THE SAFETY OF ALL PAX AND TO EXIT THE RWY AND DETERMINE THE CAUSE. I WAS ABLE TO TURN THE ACFT OFF THE RWY ON TO TAXI GOLF USING PRIMARY L BRAKING AND PWR. AT THIS POINT; THE ACFT HAD AN UNWILLINGNESS TO ROLL; SO TO PREVENT ANY FURTHER DAMAGE TO THE ACFT; THE TAXI WAS HALTED PRIOR TO THE HOLD SHORT LINE ON TXWY GOLF. AS A RESULT; THE RWY (33L) WAS CLOSED FOR APPROX 30 MINS. 2 TIRES BLEW ON THE R SIDE AND 1 ON THE L. ON SAT MORNING; THIS FLT ORIGINATED IN ACK AT APPROX XY00 AM. A FULL PREFLT INSPECTION WAS COMPLETED BY ME AND THE CAPT. NO DISCREPANCIES OR IRREGULARITIES WERE NOTED. THE FLT WAS CONDUCTED WITHOUT INCIDENT TO HYA. IN HYA WX CONDITIONS WERE 3/4 VISIBILITY IN BLOWING SNOW AND TEMPS WERE SUB-ZERO WITH THE WIND CHILL FACTOR. AGAIN; NO DISCREPANCIES OR IRREGULARITIES WERE NOTED. OUR TKOF WAS INITIATED OUT OF HYA ON RWY 06. THE MID-SECTION OF 06 HAD LIGHT COVER OF BLOWING SNOW -- SNOW DRIFTS. THE FLT WAS CONDUCTED WITHOUT INCIDENT UNTIL THE LAST PORTION OF THE LNDG ROLLOUT IN BOS ON 33L. AT NO TIME DID THE CREW OPERATE WITH BRAKES OR BRAKE DEICE HEAT ON FOR EITHER TKOF OR LNDGS. BRAKE DEICE HEAT IS NOT TO BE USED ON TKOF OR LNDGS. THROUGH AN IN-HOUSE INVESTIGATION THIS IS WHAT WAS DETERMINED. ON TKOF (RWY 06 IN HYA) FINGER DRIFTS WERE ENCOUNTERED. BRAKES WERE USED ON TAXI OUT WHICH MADE THE UNITS WARM. WHEN THE SNOW CONTACTED THE WARM BRAKES; MOISTURE FORMED ON THE BRAKE UNITS WHICH FROZE INFLT WITH THE AID OF COLD TEMPS THAT DAY. BRAKE DEICE HEAT NORMALLY IS USED AFTER THE LNDG GEAR IS EXTENDED PRIOR TO LNDG. IN THIS CASE IT WAS NOT. BOS WX WAS CLR SKIES WITH 15 MI VISIBILITY AND 20 DEGS PLUS TEMP. ON LNDG; THE BRAKE UNITS ON THE LNDG GEAR WAS FROZEN RESULTING IN BLOWN TIRES AT TOUCHDOWN. TO PREVENT THIS FROM HAPPENING IN THE FUTURE: MORE APPARENT KNOWLEDGE OF USING BRAKE DEICE HEAT. CONSIDERING ALL FACTORS AND PHASES OF ICE/SNOW ENCOUNTERED DURING A FLT. IF BRAKE DEICE WAS USED; THIS INCIDENT COULD HAVE VERY WELL BEEN AVOIDED.