Commercial Fixed Wing
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Illness / Injury; Inflight Event / Encounter Loss Of Aircraft Control; Inflight Event / Encounter Weather / Turbulence
General Physical Injury / Incapacitation
Weather
Shortly after commencing the initial descend from 40;000 on the ISVA3E for SKBO and no weather indicated on the radar; we hit turbulence causing the airplane to rapidly climb and then descend. I observed from the FC seat +/- 800 feet and +/- 10 knots of airspeed. The autopilot was engaged with LNAV/VNAV and VNAV PATH indicated on the FMA. The seatbelt sign was on. After the unexpected turbulence was over; the Captain asked me to call the Flight Attendants. #1 FA stated that it appeared two FAs were injured and that he would call back with the final assessment. A few minutes later #1 FA called back and stated two FAs and a passenger were indeed injured and required medical attention. I briefed the Captain and he directed me to have medics meet us at the gate. Upon arriving at gate; the medics boarded the airplane and only took the FAs to the local hospital.Cause - This was unexpected turbulence. Perhaps now in the summer months with convective weather in the area of SKBO; I will suggest to the Captain ask the FAs to remain seated from descend to landing.Night flying into SKBO could hide weather disturbances not shown in the radar; perhaps have the FAs finish service early and sit from descend to landing.
Air carrier First Officer reported experiencing unexpected turbulence at FL400 during initial descent to SKBO airport.