3 OF THE 4 FLT ATTENDANTS ON BOARD A B737-400 WERE INJURED DURING DSCNT WHEN THE ACFT ENTERED CUMULUS CLOUDS ASSOCIATED WITH FRONTAL ACTIVITY. PARAMEDICS ESCORTED THE INJURED FLT ATTENDANTS TO LCL HOSPITALS AFTER LNDG.

Narrative

DSNDING INTO BDL WITH ZBW; WE RECEIVED A CLRNC TO EXPEDITE OUR DSCNT THROUGH 14000 FT. WITH NO RADAR ECHOES; WE ENTERED A LAYER OF CUMULUS CLOUDS. WE EXPERIENCED MODERATE TURB ENTERING THE CLOUDS AND 1 SEVERE JOLT LASTING ABOUT 3 OR 4 SECONDS. WE HAD 144 PAX ON BOARD AND 4 FLT ATTENDANTS. I HAD MADE 3 REINFORCING ANNOUNCEMENTS FOR EVERYONE TO REMAIN SEATED WITH THEIR SEATBELTS SECURELY FASTENED. EVERYONE WAS IN THEIR SEATS SO NO PAX WERE INJURED. THE FLT ATTENDANTS WERE PREPARING THE CABIN EARLY BECAUSE THEY WERE TOLD OF THE POSSIBILITY OF A CHOPPY RIDE ON DSCNT. 3 OF THE 4 FLT ATTENDANTS WERE INJURED WHEN WE HIT THE SEVERE JOLT. THE PARAMEDICS WERE CALLED THROUGH THE COMPANY FREQ AND MET THE ACFT ON ARR. THE FLT ATTENDANTS WERE XPORTED TO LCL HOSPITALS AND WERE RELEASED WITHIN 8 HRS OF THIS INCIDENT. ALL INJURIES WERE OF A MINOR NATURE (DISLOCATED SHOULDER; BRUISED TAILBONE; BROKEN SCAPULA). MY FLT ATTENDANTS WERE SHAKEN BADLY BY THIS INCIDENT AND WERE REPLACED. THE FO AND I CONTINUED THE TRIP AND COMPLETED IT UNEVENTFULLY. WE DSND INTO CUMULUS CLOUDS ALL THE TIME AND EXPECT A CHOPPY RIDE; BUT NOTHING LIKE THIS. AS LONG AS AIRLINERS FLY THROUGH FRONTAL ACTIVITY AND CUMULUS CLOUDS THIS POTENTIAL HAZARD WILL ALWAYS EXIST.