C172 pilot misunderstands controller and takes off out of sequence at bgr.

Attributes
ACN	675220
Time
Date	200510
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bgr.airport
State Reference	ME
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	ground : takeoff roll
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : bgr.tower
Make Model Name	Gates Learjet Corp Undifferentiated or Other Model
Flight Phase	ground : holding
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : commercial
Experience	flight time last 90 days : 15 flight time total : 1000 flight time type : 800
ASRS Report	625220
Person 2
Affiliation	government : faa
Function	controller : local
Events
Anomaly	incursion : runway non adherence : published procedure non adherence : far non adherence : clearance
Independent Detector	other controllera
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Taxiing for departure at bgr; taxied behind learjet; I was #3 taxiing. DC10 took off. I moved to the run-up area; completed run-up checks; taxied back out behind the learjet. Called tower and told them I was ready in sequence. Tower cleared learjet to taxi into position and hold. Then called me and I must have misunderstood. I thought he said 'taxi and cleared to depart.' I thought the operation was out of the normal. When I was at 300 ft AGL; I thought he would ask me to expedite the turn on course; to get out of the learjet's way. But he called the learjet and asked if the cessna just took off in front of him. I called the tower and then asked what the trouble was; and wasn't I cleared. He said no; he was holding departure for wake turbulence. That was the end of the conflict. The rest of the calls were normal for the balance of the flight. The learjet was not lined up on the runway when I departed.

Original NASA ASRS Text

Title: C172 PLT MISUNDERSTANDS CTLR AND TAKES OFF OUT OF SEQUENCE AT BGR.

Narrative: TAXIING FOR DEP AT BGR; TAXIED BEHIND LEARJET; I WAS #3 TAXIING. DC10 TOOK OFF. I MOVED TO THE RUN-UP AREA; COMPLETED RUN-UP CHKS; TAXIED BACK OUT BEHIND THE LEARJET. CALLED TWR AND TOLD THEM I WAS READY IN SEQUENCE. TWR CLRED LEARJET TO TAXI INTO POS AND HOLD. THEN CALLED ME AND I MUST HAVE MISUNDERSTOOD. I THOUGHT HE SAID 'TAXI AND CLRED TO DEPART.' I THOUGHT THE OP WAS OUT OF THE NORMAL. WHEN I WAS AT 300 FT AGL; I THOUGHT HE WOULD ASK ME TO EXPEDITE THE TURN ON COURSE; TO GET OUT OF THE LEARJET'S WAY. BUT HE CALLED THE LEARJET AND ASKED IF THE CESSNA JUST TOOK OFF IN FRONT OF HIM. I CALLED THE TWR AND THEN ASKED WHAT THE TROUBLE WAS; AND WASN'T I CLRED. HE SAID NO; HE WAS HOLDING DEP FOR WAKE TURB. THAT WAS THE END OF THE CONFLICT. THE REST OF THE CALLS WERE NORMAL FOR THE BAL OF THE FLT. THE LEARJET WAS NOT LINED UP ON THE RWY WHEN I DEPARTED.

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.