AN A320 ACFT ENCOUNTERED MOUNTAIN WAVE WHICH RESULTED IN INSTANTANEOUS SPD INCREASE. ACFT; AS DESIGNED; WENT INTO OVERSPD PROTECTION; PITCH UP (TO SLOW); THROTTLES TO IDLE AND REDUCED SIDESTICK AUTH (PITCH CTL). ALTDEV OCCURRED DUE TO PITCH UP AND FLC'S RELUCTANCE TO CREATE NEGATIVE G'S PUSHING OVER.

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AIRBUS A320; MOUNTAIN WAVE ENCOUNTER. BOTH MYSELF AND FO RELATIVELY LOW TIMERS IN ACFT. MY FIRST MOUNTAIN WAVE ENCOUNTER IN THIS ACFT. IN PREVIOUS ACFT I RELIED ON THROTTLE MOVEMENT TO HELP ALERT ME TO MOUNTAIN WAVE. IN THE AIRBUS THERE IS NO THROTTLE MOVEMENT. ABOUT THE TIME I PERCEIVED WE WERE ENCOUNTERING MOUNTAIN WAVE WE GOT AN OVERSPD WARNING; THE ACFT INITIATED A CLB AND DISENGAGED THE AUTOPLT AND AUTOTHROTTLES. THE SIDESTICK IN THIS SIT HAS REDUCED AUTH (I LATER READ). I IMMEDIATELY TOOK THE CTLS AND REDUCED THE THROTTLES AND BEGAN A NOSE OVER. BECAUSE OF THE REDUCED AUTH OF THE SIDE-STICK AND MY ATTEMPT TO AVOID NEGATIVE 'G'S' WE CLBED APPROX 500 FT BEFORE I MANAGED TO GET A DSCNT GOING. WE WERE OFF OUR ASSIGNED FLT LEVEL NO MORE THAN 30 SECONDS; AND ABOVE 33300 FT NO MORE THAN 10 SECONDS. I REMEMBER BEING BRIEFED ON THIS IN TRAINING; BUT I SUSPECT IT IS SOMETHING THAT CANNOT BE TAUGHT IN SCHOOL TO A LEVEL OF PROFICIENCY WITHOUT A LOT OF TRAINING. IN A TRAINING ENVIRONMENT WHERE WE ARE ALREADY PUTTING 10 LBS IN A 5 LB BAG; I DON'T BELIEVE THERE IS THE ROOM OR RESOURCE FOR SOMETHING LIKE THIS TO BE TAUGHT EXTENSIVELY; SOMETHING THAT ONE MAY OR MAY NOT ENCOUNTER. THE NEXT TIME I SUSPECT MOUNTAIN WAVE IS POSSIBLE OR SEE IT FORECAST; I'LL GIVE EXTRA THOUGHT TO DECREASING OUR MACH NUMBER ONLY TO HELP ELIMINATE THIS PROB; OR AT LEAST TO GIVE ME THAT EXTRA SECOND OR TWO TO REACT.