C150 instructor and student heard the landing C172 announce clear of the runway when they were not. The C150 took off over the C172, which was on taxiway at end of runway but not yet past the hold line.

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Attributes
ACN	595313
Time
Date	200310
Day	Fri
Local Time Of Day	0601 To 1200
Place
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Cessna 150
Operating Under FAR Part	Part 91
Flight Phase	climbout : takeoff climbout : initial
Flight Plan	None
Aircraft 2
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	ground : holding ground : taxi landing : roll
Person 1
Affiliation	other
Function	instruction : instructor
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 60 flight time total : 750 flight time type : 200
ASRS Report	595313
Person 2
Affiliation	other
Function	instruction : trainee
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : far other anomaly other other spatial deviation
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : anomaly accepted none taken : detected after the fact
Miss Distance	horizontal : 100 vertical : 200
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

I was giving dual instruction to a student pilot. We were in the run-up area to runway 31 doing the before check. The check was completed and I watched a C172 land on runway 31. My student did a 360 degree clearing turn in the run-up area and we checked the pattern to take the runway. During the clearing turn, I heard the landing cessna pilot say he was clear of the runway. The area was clear for us to take runway 31. I looked down the runway and saw the cessna turning onto the perpendicular taxiway. It appeared to me that he was clear of the runway. My student took off, and during climb out, I looked down and saw that the cessna that just landed was not completely past the hold bars for the runway. There was not a collision hazard nor was evasive action taken. Thinking back, I should have waited a little longer and waited until the aircraft was further onto the taxiway, and not assume he was clear of the runway just because the pilot said he was. Also, there are only painted hold bars for the runway and no signs for the hold bars. If signs were posted, it would be easier to know for sure when another aircraft has cleared the hold bars.

Original NASA ASRS Text

Title: C150 INSTRUCTOR AND STUDENT HEARD THE LNDG C172 ANNOUNCE CLR OF THE RWY WHEN THEY WERE NOT. THE C150 TOOK OFF OVER THE C172, WHICH WAS ON TXWY AT END OF RWY BUT NOT YET PAST THE HOLD LINE.

Narrative: I WAS GIVING DUAL INSTRUCTION TO A STUDENT PLT. WE WERE IN THE RUN-UP AREA TO RWY 31 DOING THE BEFORE CHK. THE CHK WAS COMPLETED AND I WATCHED A C172 LAND ON RWY 31. MY STUDENT DID A 360 DEG CLRING TURN IN THE RUN-UP AREA AND WE CHKED THE PATTERN TO TAKE THE RWY. DURING THE CLRING TURN, I HEARD THE LNDG CESSNA PLT SAY HE WAS CLR OF THE RWY. THE AREA WAS CLR FOR US TO TAKE RWY 31. I LOOKED DOWN THE RWY AND SAW THE CESSNA TURNING ONTO THE PERPENDICULAR TXWY. IT APPEARED TO ME THAT HE WAS CLR OF THE RWY. MY STUDENT TOOK OFF, AND DURING CLBOUT, I LOOKED DOWN AND SAW THAT THE CESSNA THAT JUST LANDED WAS NOT COMPLETELY PAST THE HOLD BARS FOR THE RWY. THERE WAS NOT A COLLISION HAZARD NOR WAS EVASIVE ACTION TAKEN. THINKING BACK, I SHOULD HAVE WAITED A LITTLE LONGER AND WAITED UNTIL THE ACFT WAS FURTHER ONTO THE TXWY, AND NOT ASSUME HE WAS CLR OF THE RWY JUST BECAUSE THE PLT SAID HE WAS. ALSO, THERE ARE ONLY PAINTED HOLD BARS FOR THE RWY AND NO SIGNS FOR THE HOLD BARS. IF SIGNS WERE POSTED, IT WOULD BE EASIER TO KNOW FOR SURE WHEN ANOTHER ACFT HAS CLRED THE HOLD BARS.

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.