Flight instructor and student take off without clearance when they mistake someone else's clearance ...

Attributes
ACN	473390
Time
Date	200005
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : oma.airport
State Reference	NE
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : oma.tower
Operator	general aviation : instructional
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Operating Under FAR Part	Part 91
Flight Phase	climbout : initial climbout : takeoff ground : taxi ground : takeoff roll
Flight Plan	VFR
Aircraft 2
Controlling Facilities	tower : oma.tower
Make Model Name	Cessna Citation Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Person 1
Affiliation	other
Function	instruction : instructor
Qualification	pilot : commercial pilot : multi engine pilot : cfi
Experience	flight time last 90 days : 60 flight time total : 1300 flight time type : 300
ASRS Report	473390
Person 2
Affiliation	other
Function	instruction : trainee
Qualification	pilot : student
Events
Anomaly	incursion : runway non adherence : published procedure non adherence : clearance non adherence : far other anomaly other
Independent Detector	other controllerb other flight crewa
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

My student and I taxied out to the runup area. We did the runup and switched radio frequencys. We taxied up to the hold short line. The student called tower 'oma tower trainer X ready for takeoff (paused) runway 14L.' when he let go of the microphone we heard 'turn to heading 140 degrees, cleared for takeoff.' my student read back the clearance. I asked him if he was sure that was for us. He responded yes. Because we heard no other traffic, I allowed him to taxi onto the runway. As we did, we heard someone say 'tower citation Y..., I think someone else was talking to you.' as we proceeded to take off, we got about 50 ft in the air when tower told us we had taken off without a takeoff clearance. He told us to listen up and go to departure. Both my student and I were convinced we had takeoff clearance. I spent more time with the student on radio procedures. I also believe the controller needs to be a little more patient when giving clrncs because they know at oma a plane using the call sign trainer X is engaged in flight training.

Original NASA ASRS Text

Title: FLT INSTRUCTOR AND STUDENT TAKE OFF WITHOUT CLRNC WHEN THEY MISTAKE SOMEONE ELSE'S CLRNC FOR THEIR OWN.

Narrative: MY STUDENT AND I TAXIED OUT TO THE RUNUP AREA. WE DID THE RUNUP AND SWITCHED RADIO FREQS. WE TAXIED UP TO THE HOLD SHORT LINE. THE STUDENT CALLED TWR 'OMA TWR TRAINER X READY FOR TKOF (PAUSED) RWY 14L.' WHEN HE LET GO OF THE MIKE WE HEARD 'TURN TO HDG 140 DEGS, CLRED FOR TKOF.' MY STUDENT READ BACK THE CLRNC. I ASKED HIM IF HE WAS SURE THAT WAS FOR US. HE RESPONDED YES. BECAUSE WE HEARD NO OTHER TFC, I ALLOWED HIM TO TAXI ONTO THE RWY. AS WE DID, WE HEARD SOMEONE SAY 'TWR CITATION Y..., I THINK SOMEONE ELSE WAS TALKING TO YOU.' AS WE PROCEEDED TO TAKE OFF, WE GOT ABOUT 50 FT IN THE AIR WHEN TWR TOLD US WE HAD TAKEN OFF WITHOUT A TKOF CLRNC. HE TOLD US TO LISTEN UP AND GO TO DEP. BOTH MY STUDENT AND I WERE CONVINCED WE HAD TKOF CLRNC. I SPENT MORE TIME WITH THE STUDENT ON RADIO PROCS. I ALSO BELIEVE THE CTLR NEEDS TO BE A LITTLE MORE PATIENT WHEN GIVING CLRNCS BECAUSE THEY KNOW AT OMA A PLANE USING THE CALL SIGN TRAINER X IS ENGAGED IN FLT TRAINING.

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.

Flight instructor and student take off without clearance when they mistake someone else's clearance for their own.