C172 INSTRUCTOR; DEMONSTRATING A SPIN WITH FLAPS EXTENDED; FORGETS TO RETRACT THEM PRIOR TO SPIN ENTRY CAUSING STRESS DAMAGE TO THE RIGHT WING FLAP.

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THE PURPOSE OF THE LESSON WAS TO PROVIDE A STUDENT WITH THE REQUIRED SPIN TRAINING FOR HIS CFI CERTIFICATE. THE WT AND BAL SHOWED THAT THE AIRPLANE WAS WITHIN CTR OF GRAVITY LIMITS IN THE UTILITY CATEGORY. THE LESSON BEGAN WITH A PREFLT INSPECTION OF THE C172; FAMILIARIZING HIM WITH THE V-SPDS; PREFLT PECULIARITIES OF THE CESSNA AND THEN WE DISCUSSED WHAT WE WERE GOING TO DO IN THE LESSON; INCLUDING A DISCUSSION OF SPIN CHARACTERISTICS; STALL RECOGNITION; SPIN ENTRY AND RECOVERY. AFTER THAT WE FLEW NORTH TO THE PRACTICE AREA AND CLBED TO 6500 FT WHERE WE PROCEEDED TO DO CLRING TURNS AND THEN A COUPLE OF SPIN ENTRIES FROM BOTH A PWR-ON AND PWR-OFF SIT. THEN; I SLOWED THE AIRPLANE TO APCH SPD; PUT ON FLAPS TO DEMONSTRATE WHAT MIGHT HAPPEN IN A XCTLED SIT WHEN A STUDENT TURNS FROM BASE TO FINAL; BUT INTENDED TO BRING THE FLAPS UP BEFORE SPIN ENTRY; BUT AS I EXPLAINED THE LESSON TO THE STUDENT; I FORGOT ABOUT THE FLAPS. WHEN I REMEMBERED THAT THE FLAPS WERE DOWN WE WERE INTO THE SPIN. WE IMMEDIATELY RECOVERED FROM THE SPIN; LEVELED OFF AND RETRACTED THE FLAPS; BUT THE DAMAGE HAD BEEN DONE. WE RETURNED TO THE ARPT WHERE WE DISCOVERED THAT THE FLAP ON THE R WING HAD SUSTAINED STRESS DAMAGE.