Narrative:

Returning to hanscom field from a training flight at beverly airport, we were northeast of the field. Runway 29 was in use, wind northwest 15-18 KTS. My student called 7 northeast for landing and was told to report 1 mi out. I called the tower 1 mi east and requested to cross over the field at 11000 ft to land taxiway south, and was cleared to do so. It is normal operations at hanscom for helicopters to land on txwys and for the local controller to coordinate with the ground controller. Since the wind was from the northwest I told my student to maintain altitude, cross overhead, maintain a southwest heading, begin a descent, and then circle east to land taxiway south into the wind. As we turned final for taxiway south, there was no traffic except for company helicopter also landing taxiway south north of our position. Company helicopter landed, and departed taxiway south for the west ramp as we continued our approach. On short final, about 10 ft AGL, company pilot stated on the tower frequency, 'helicopter go around.' without realizing why company pilot was telling me to go around, I took control from my student, pulled up on the collective and then saw a mooney passing directly beneath my helicopter in a fast taxi on taxiway south from south to north. I immediately applied right cyclic while continuing to pull collective, and cleared taxiway south to the west ramp. At the moment I initially pulled collective pitch, the tower controller came on the frequency and asked me if I had the traffic (mooney), I replied 'I do now.' the tower controller apologized. I continued to taxi to the west ramp and shut down. Once in the office I was told to contact the tower controller by phone. He apologized again and said that he had coordinated twice with the ground controller for taxiway south -- once for company helicopter, and once for me. I believe this situation occurred because the ground controller gave the mooney clearance to taxi without checking that the tower controller was finished using taxiway south. I am unaware if the ground controller notified the mooney pilot that we were landing taxiway south, or if the mooney ever saw us. He appeared to be taxiing at an unusually fast rate. I believe that an actual collision was averted due to the quick action of company pilot telling me to go around just prior to my final 5 ft descent into a hover.

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Original NASA ASRS Text

Title: HELI APCHING TO LAND TOLD GAR BY COMPANY PLT IN OTHER ACFT. SMA TAXIING ON TXWY BELOW HELI.

Narrative: RETURNING TO HANSCOM FIELD FROM A TRAINING FLT AT BEVERLY ARPT, WE WERE NE OF THE FIELD. RWY 29 WAS IN USE, WIND NW 15-18 KTS. MY STUDENT CALLED 7 NE FOR LNDG AND WAS TOLD TO RPT 1 MI OUT. I CALLED THE TWR 1 MI E AND REQUESTED TO CROSS OVER THE FIELD AT 11000 FT TO LAND TXWY S, AND WAS CLRED TO DO SO. IT IS NORMAL OPS AT HANSCOM FOR HELIS TO LAND ON TXWYS AND FOR THE LCL CTLR TO COORDINATE WITH THE GND CTLR. SINCE THE WIND WAS FROM THE NW I TOLD MY STUDENT TO MAINTAIN ALT, CROSS OVERHEAD, MAINTAIN A SW HDG, BEGIN A DSCNT, AND THEN CIRCLE E TO LAND TXWY S INTO THE WIND. AS WE TURNED FINAL FOR TXWY S, THERE WAS NO TFC EXCEPT FOR COMPANY HELI ALSO LNDG TXWY S N OF OUR POS. COMPANY HELI LANDED, AND DEPARTED TXWY S FOR THE W RAMP AS WE CONTINUED OUR APCH. ON SHORT FINAL, ABOUT 10 FT AGL, COMPANY PLT STATED ON THE TWR FREQ, 'HELI GAR.' WITHOUT REALIZING WHY COMPANY PLT WAS TELLING ME TO GAR, I TOOK CTL FROM MY STUDENT, PULLED UP ON THE COLLECTIVE AND THEN SAW A MOONEY PASSING DIRECTLY BENEATH MY HELI IN A FAST TAXI ON TXWY S FROM S TO N. I IMMEDIATELY APPLIED R CYCLIC WHILE CONTINUING TO PULL COLLECTIVE, AND CLRED TXWY S TO THE W RAMP. AT THE MOMENT I INITIALLY PULLED COLLECTIVE PITCH, THE TWR CTLR CAME ON THE FREQ AND ASKED ME IF I HAD THE TFC (MOONEY), I REPLIED 'I DO NOW.' THE TWR CTLR APOLOGIZED. I CONTINUED TO TAXI TO THE W RAMP AND SHUT DOWN. ONCE IN THE OFFICE I WAS TOLD TO CONTACT THE TWR CTLR BY PHONE. HE APOLOGIZED AGAIN AND SAID THAT HE HAD COORDINATED TWICE WITH THE GND CTLR FOR TXWY S -- ONCE FOR COMPANY HELI, AND ONCE FOR ME. I BELIEVE THIS SIT OCCURRED BECAUSE THE GND CTLR GAVE THE MOONEY CLRNC TO TAXI WITHOUT CHKING THAT THE TWR CTLR WAS FINISHED USING TXWY S. I AM UNAWARE IF THE GND CTLR NOTIFIED THE MOONEY PLT THAT WE WERE LNDG TXWY S, OR IF THE MOONEY EVER SAW US. HE APPEARED TO BE TAXIING AT AN UNUSUALLY FAST RATE. I BELIEVE THAT AN ACTUAL COLLISION WAS AVERTED DUE TO THE QUICK ACTION OF COMPANY PLT TELLING ME TO GAR JUST PRIOR TO MY FINAL 5 FT DSCNT INTO A HOVER.

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.