Narrative:

After a thorough preflight by my student, we received our clearance from ground control (meacham tower) to taxi to 34R. We proceeded with our normal caution to taxi to 34R. After entering taxiway C we did our normal taxi check of instruments for our far 61 instrument training flight (VFR). I and my student noticed we were following an mlt Y which had taxied from the main terminal. We proceeded with caution to stop our aircraft a safe distance (approximately 75 yds) after we saw the mlt Y had stopped. I reminded my student to always remain a safe distance behind large aircraft because of the propeller wash they can generate. With the distance we had I could still feel turbulence of the mlt Y. I told my student he must be doing his run-up here. We discussed doing our normal run-up at this point, but I told my student we should wait and do it at the normal run-up area at the end of the taxiway. I told him I did not want to have our run-up stopped in the middle of our check in case the mlt Y might move into sequence. After the mlt Y started moving into sequence and stopped, we started moving at normal taxi speed. I was watching the mlt Y to see if he was going to run-up in sequence and told my student watch the mlt Y to see if he was going to increase his power or not. After approximately 15 seconds and no change in the mlt Y's apparent power, we proceeded to taxi behind the aircraft with cautioned full right aileron to prevent being turned over by the mlt Y's idle power. As we were passing behind the mlt Y he ran up his engines. I told my student we've got to get by him or he'll turn us over. The strength of the mlt Y was too strong and fast for us in our small aircraft X and as we were being picked up on our left main and nose gear I took control of the aircraft from the student. The mlt Y's propeller wash cracked our left wingtip and bent our propeller. The mlt Y reduced his power and we let down on all 3 gear. Ground control asked if we needed any assistance and I said negative. The mlt Y again increased his power for run-up and we were picked up again. I told ground control 'please ask the mlt Y to reduce his RPM so we can pull the aircraft forward.' the ground did so and the mlt Y slowed his RPM. I believe the mlt Y crew did not exercise proper caution in the position on the ramp they performed their run-up. I believe they should have performed their run-up where no one could get behind them as we practice in our flight school.

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Original NASA ASRS Text

Title: FLT SCHOOL SMA X SUFFERS WINGTIP AND PROPELLER DAMAGE WHEN NEARLY TIPPED OVER BY PROPELLER WASH FROM MLT Y DOING ENGINE RUNUP.

Narrative: AFTER A THOROUGH PREFLT BY MY STUDENT, WE RECEIVED OUR CLRNC FROM GND CTL (MEACHAM TWR) TO TAXI TO 34R. WE PROCEEDED WITH OUR NORMAL CAUTION TO TAXI TO 34R. AFTER ENTERING TXWY C WE DID OUR NORMAL TAXI CHECK OF INSTRUMENTS FOR OUR FAR 61 INSTRUMENT TRAINING FLT (VFR). I AND MY STUDENT NOTICED WE WERE FOLLOWING AN MLT Y WHICH HAD TAXIED FROM THE MAIN TERMINAL. WE PROCEEDED WITH CAUTION TO STOP OUR ACFT A SAFE DISTANCE (APPROX 75 YDS) AFTER WE SAW THE MLT Y HAD STOPPED. I REMINDED MY STUDENT TO ALWAYS REMAIN A SAFE DISTANCE BEHIND LARGE ACFT BECAUSE OF THE PROPELLER WASH THEY CAN GENERATE. WITH THE DISTANCE WE HAD I COULD STILL FEEL TURBULENCE OF THE MLT Y. I TOLD MY STUDENT HE MUST BE DOING HIS RUN-UP HERE. WE DISCUSSED DOING OUR NORMAL RUN-UP AT THIS POINT, BUT I TOLD MY STUDENT WE SHOULD WAIT AND DO IT AT THE NORMAL RUN-UP AREA AT THE END OF THE TXWY. I TOLD HIM I DID NOT WANT TO HAVE OUR RUN-UP STOPPED IN THE MIDDLE OF OUR CHECK IN CASE THE MLT Y MIGHT MOVE INTO SEQUENCE. AFTER THE MLT Y STARTED MOVING INTO SEQUENCE AND STOPPED, WE STARTED MOVING AT NORMAL TAXI SPEED. I WAS WATCHING THE MLT Y TO SEE IF HE WAS GOING TO RUN-UP IN SEQUENCE AND TOLD MY STUDENT WATCH THE MLT Y TO SEE IF HE WAS GOING TO INCREASE HIS POWER OR NOT. AFTER APPROX 15 SECONDS AND NO CHANGE IN THE MLT Y'S APPARENT POWER, WE PROCEEDED TO TAXI BEHIND THE ACFT WITH CAUTIONED FULL RIGHT AILERON TO PREVENT BEING TURNED OVER BY THE MLT Y'S IDLE POWER. AS WE WERE PASSING BEHIND THE MLT Y HE RAN UP HIS ENGINES. I TOLD MY STUDENT WE'VE GOT TO GET BY HIM OR HE'LL TURN US OVER. THE STRENGTH OF THE MLT Y WAS TOO STRONG AND FAST FOR US IN OUR SMA X AND AS WE WERE BEING PICKED UP ON OUR LEFT MAIN AND NOSE GEAR I TOOK CONTROL OF THE ACFT FROM THE STUDENT. THE MLT Y'S PROPELLER WASH CRACKED OUR LEFT WINGTIP AND BENT OUR PROPELLER. THE MLT Y REDUCED HIS POWER AND WE LET DOWN ON ALL 3 GEAR. GND CTL ASKED IF WE NEEDED ANY ASSISTANCE AND I SAID NEGATIVE. THE MLT Y AGAIN INCREASED HIS POWER FOR RUN-UP AND WE WERE PICKED UP AGAIN. I TOLD GND CTL 'PLEASE ASK THE MLT Y TO REDUCE HIS RPM SO WE CAN PULL THE ACFT FORWARD.' THE GND DID SO AND THE MLT Y SLOWED HIS RPM. I BELIEVE THE MLT Y CREW DID NOT EXERCISE PROPER CAUTION IN THE POSITION ON THE RAMP THEY PERFORMED THEIR RUN-UP. I BELIEVE THEY SHOULD HAVE PERFORMED THEIR RUN-UP WHERE NO ONE COULD GET BEHIND THEM AS WE PRACTICE IN OUR FLT SCHOOL.

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.