Narrative:

Student and myself were practicing minimum ctlable airspeed at 1500 ft AGL, 5 mi southwest of bct at approximately AB30. While practicing minimum ctlable airspeed, the aircraft suddenly rolled, stalled, then entered a spin. Immediate recovery techniques were initiated and recovery was complete at approximately 800 ft AGL. We immediately began a maximum effort climb to prevent further altitude loss. It is believed that we entered clear air turbulence or wake turbulence. The traffic pattern altitude for turbojet and multi engine aircraft at bct is 1500 ft AGL and therefore we may have encountered wake turbulence. We typically practice minimum ctlable airspeed at higher altitudes but because of the proficiency level of both the student and myself we did not believe that was necessary. Upon contacting our destination tower (fxe) we were instructed to remain outside class D airspace. We circled at 1000 ft AGL for approximately 4 mins before being allowed into the class D airspace. In the future I will always practice maneuvers at a higher altitude because of the unforecast hazards at lower altitudes.

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Original NASA ASRS Text

Title: INSTRUCTOR PLT AND STUDENT GET INTO A SPIN DURING PRACTICED SLOW FLT AT 1500 FT. THEY RECOVER ACFT AT 800 FT AGL. INSTRUCTOR PLT CITES POSSIBLE WAKE TURB.

Narrative: STUDENT AND MYSELF WERE PRACTICING MINIMUM CTLABLE AIRSPD AT 1500 FT AGL, 5 MI SW OF BCT AT APPROX AB30. WHILE PRACTICING MINIMUM CTLABLE AIRSPD, THE ACFT SUDDENLY ROLLED, STALLED, THEN ENTERED A SPIN. IMMEDIATE RECOVERY TECHNIQUES WERE INITIATED AND RECOVERY WAS COMPLETE AT APPROX 800 FT AGL. WE IMMEDIATELY BEGAN A MAX EFFORT CLB TO PREVENT FURTHER ALT LOSS. IT IS BELIEVED THAT WE ENTERED CLR AIR TURB OR WAKE TURB. THE TFC PATTERN ALT FOR TURBOJET AND MULTI ENG ACFT AT BCT IS 1500 FT AGL AND THEREFORE WE MAY HAVE ENCOUNTERED WAKE TURB. WE TYPICALLY PRACTICE MINIMUM CTLABLE AIRSPD AT HIGHER ALTS BUT BECAUSE OF THE PROFICIENCY LEVEL OF BOTH THE STUDENT AND MYSELF WE DID NOT BELIEVE THAT WAS NECESSARY. UPON CONTACTING OUR DEST TWR (FXE) WE WERE INSTRUCTED TO REMAIN OUTSIDE CLASS D AIRSPACE. WE CIRCLED AT 1000 FT AGL FOR APPROX 4 MINS BEFORE BEING ALLOWED INTO THE CLASS D AIRSPACE. IN THE FUTURE I WILL ALWAYS PRACTICE MANEUVERS AT A HIGHER ALT BECAUSE OF THE UNFORECAST HAZARDS AT LOWER ALTS.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.