Small transport takes clearance meant for air carrier. Takeoff without clearance.

Attributes
ACN	177055
Time
Date	199104
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : jan
State Reference	MS
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : cos
Operator	common carrier : air taxi
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	climbout : takeoff
Flight Plan	None
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 2800 flight time type : 180
ASRS Report	177055
Person 2
Affiliation	company : air taxi
Function	other personnel other
Qualification	other other : other
Events
Anomaly	incursion : runway other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : unable
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I called the tower to tell them that I was ready to take off. To the best of my understanding they cleared me for takeoff. I read back the clearance. It was only after I was airborne that they informed me that I took the clearance of an air carrier jet. I believe that the problem was an overloaded frequency and that every time I spoke somebody was speaking at the same time. I believe that the controller could have asked me to abort my takeoff and that he didn't because I didn't cause any conflict. This is my second report. I have already sent you one. Pilot and mechanic heard takeoff clearance. Pilot took off only after saying, '(tail #) cleared for takeoff.'

Original NASA ASRS Text

Title: SMT TAKES CLRNC MEANT FOR ACR. TKOF WITHOUT CLRNC.

Narrative: I CALLED THE TWR TO TELL THEM THAT I WAS READY TO TAKE OFF. TO THE BEST OF MY UNDERSTANDING THEY CLRED ME FOR TKOF. I READ BACK THE CLRNC. IT WAS ONLY AFTER I WAS AIRBORNE THAT THEY INFORMED ME THAT I TOOK THE CLRNC OF AN ACR JET. I BELIEVE THAT THE PROB WAS AN OVERLOADED FREQ AND THAT EVERY TIME I SPOKE SOMEBODY WAS SPEAKING AT THE SAME TIME. I BELIEVE THAT THE CTLR COULD HAVE ASKED ME TO ABORT MY TKOF AND THAT HE DIDN'T BECAUSE I DIDN'T CAUSE ANY CONFLICT. THIS IS MY SECOND RPT. I HAVE ALREADY SENT YOU ONE. PLT AND MECH HEARD TKOF CLRNC. PLT TOOK OFF ONLY AFTER SAYING, '(TAIL #) CLRED FOR TKOF.'

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.