C175 has a conflict on takeoff roll with an R44 helicopter landing in close proximity.

Attributes
ACN	693310
Time
Date	200602
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : gtu.airport
State Reference	TX
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Skylark 175
Operating Under FAR Part	Part 91
Flight Phase	climbout : takeoff
Flight Plan	IFR
Aircraft 2
Make Model Name	Helicopter
Flight Phase	descent : approach
Person 1
Affiliation	other
Function	instruction : instructor oversight : pic
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 250 flight time total : 1130 flight time type : 21
ASRS Report	693310
Person 2
Affiliation	other
Function	instruction : trainee
Events
Anomaly	conflict : ground critical non adherence : far
Independent Detector	other flight crewa
Resolutory Action	flight crew : rejected takeoff
Miss Distance	horizontal : 0 vertical : 50
Supplementary
Problem Areas	Airport Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

We obtained our IFR clearance via the rco at the airport and then waited for several aircraft to land on the runway. After several mins there was a large enough gap for us to take off. One airplane was announcing his position mid-field on the downwind; while a helicopter announced turning downwind. The helicopter had just performed a landing on the runway. We announced our takeoff on the CTAF and taxied into position. As my student was applying full power for takeoff; the helicopter suddenly appeared directly above us. The helicopter had not made any calls after announcing his entry onto the downwind leg. I called for an 'abort takeoff' and my student brought power back to idle. The helicopter then landed on the runway; and immediately took off again. We waited on the runway for about 1 min before attempting a takeoff in order to allow the rotor wash to settle.

Original NASA ASRS Text

Title: C175 HAS A CONFLICT ON TKOF ROLL WITH AN R44 HELI LNDG IN CLOSE PROX.

Narrative: WE OBTAINED OUR IFR CLRNC VIA THE RCO AT THE ARPT AND THEN WAITED FOR SEVERAL ACFT TO LAND ON THE RWY. AFTER SEVERAL MINS THERE WAS A LARGE ENOUGH GAP FOR US TO TAKE OFF. ONE AIRPLANE WAS ANNOUNCING HIS POS MID-FIELD ON THE DOWNWIND; WHILE A HELI ANNOUNCED TURNING DOWNWIND. THE HELI HAD JUST PERFORMED A LNDG ON THE RWY. WE ANNOUNCED OUR TKOF ON THE CTAF AND TAXIED INTO POS. AS MY STUDENT WAS APPLYING FULL PWR FOR TKOF; THE HELI SUDDENLY APPEARED DIRECTLY ABOVE US. THE HELI HAD NOT MADE ANY CALLS AFTER ANNOUNCING HIS ENTRY ONTO THE DOWNWIND LEG. I CALLED FOR AN 'ABORT TKOF' AND MY STUDENT BROUGHT PWR BACK TO IDLE. THE HELI THEN LANDED ON THE RWY; AND IMMEDIATELY TOOK OFF AGAIN. WE WAITED ON THE RWY FOR ABOUT 1 MIN BEFORE ATTEMPTING A TKOF IN ORDER TO ALLOW THE ROTOR WASH TO SETTLE.

Data retrieved from NASA's ASRS site as of January 2009 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.