Instructor and student pilot of C150; cleared to taxi to the active runway; instead taxi into position forcing a go around by aircraft on approach. Then proceed to takeoff without clearance.

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Attributes
ACN	796800
Time
Date	200807
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : bet.airport
State Reference	AK
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bet.tower tower : zzz.tower
Operator	general aviation : personal
Make Model Name	Cessna 150
Operating Under FAR Part	Part 91
Flight Phase	ground : takeoff roll ground : position and hold ground : taxi
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : bet.tower
Make Model Name	Small Aircraft
Flight Phase	descent : approach landing : go around
Person 1
Affiliation	other
Function	instruction : instructor
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 75 flight time total : 1560 flight time type : 200
ASRS Report	796800
Person 2
Affiliation	government : faa
Function	controller : local
Events
Anomaly	conflict : ground less severe incursion : runway non adherence : clearance non adherence : far other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : unable
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was told to taxi to runway 29. I taxied onto the runway. A plane was on final. It had to go around. In the confusion of the situation; the tower told me I made a mistake and I asked him if I should get off. He said it is too late now. Then I took off without clearance. I did not listen to taxi 'to' runway 29. Then; I let the confusion of the blind me into thinking I had takeoff clearance. Contributing factors: I was teaching a primary student; I wasn't hurrying or anything; I wasn't overly tired.

Original NASA ASRS Text

Title: INSTRUCTOR AND STUDENT PLT OF C150; CLRED TO TAXI TO THE ACTIVE RWY; INSTEAD TAXI INTO POSITION FORCING A GAR BY ACFT ON APCH. THEN PROCEED TO TKOF WITHOUT CLRNC.

Narrative: I WAS TOLD TO TAXI TO RWY 29. I TAXIED ONTO THE RWY. A PLANE WAS ON FINAL. IT HAD TO GO AROUND. IN THE CONFUSION OF THE SITUATION; THE TWR TOLD ME I MADE A MISTAKE AND I ASKED HIM IF I SHOULD GET OFF. HE SAID IT IS TOO LATE NOW. THEN I TOOK OFF WITHOUT CLRNC. I DID NOT LISTEN TO TAXI 'TO' RWY 29. THEN; I LET THE CONFUSION OF THE BLIND ME INTO THINKING I HAD TKOF CLRNC. CONTRIBUTING FACTORS: I WAS TEACHING A PRIMARY STUDENT; I WASN'T HURRYING OR ANYTHING; I WASN'T OVERLY TIRED.

Data retrieved from NASA's ASRS site as of May 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.