Tower controller cleared the flight crew of an mdt for takeoff on a parallel runway to a B757 cleared 1 min earlier for takeoff. The reporter thought that the B757 was rather close during climb out but did not experience any wake turbulence.

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Attributes
ACN	332621
Time
Date	199604
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	agl bound lower : 0 agl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dfw
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : takeoff climbout : initial climbout : intermediate altitude
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : takeoff climbout : intermediate altitude climbout : initial
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	other other : other pilot : cfi pilot : atp
Experience	flight time last 90 days : 240 flight time total : 11000 flight time type : 5000
ASRS Report	332621
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 6000 vertical : 1000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We were cleared for takeoff on runway 18R. Just prior to that takeoff clearance at approximately XX09L a B757 was cleared for takeoff on runway 18L. Our takeoff was uneventful, but we did notice that we appeared closer than normal to the B757 that took off on runway 18L. We departed on the SID to the west and didn't think anything of it till the dfw tower around 3 hours later called us up to say there was controller training in progress and that the instructor tried to cancel our takeoff clearance. We notified the tower that we never received nor acknowledged a takeoff cancellation. We also notified them that we had the B757 in sight at all times. They said there was a separation problem.

Original NASA ASRS Text

Title: TWR CTLR CLRED THE FLC OF AN MDT FOR TKOF ON A PARALLEL RWY TO A B757 CLRED 1 MIN EARLIER FOR TKOF. THE RPTR THOUGHT THAT THE B757 WAS RATHER CLOSE DURING CLBOUT BUT DID NOT EXPERIENCE ANY WAKE TURB.

Narrative: WE WERE CLRED FOR TKOF ON RWY 18R. JUST PRIOR TO THAT TKOF CLRNC AT APPROX XX09L A B757 WAS CLRED FOR TKOF ON RWY 18L. OUR TKOF WAS UNEVENTFUL, BUT WE DID NOTICE THAT WE APPEARED CLOSER THAN NORMAL TO THE B757 THAT TOOK OFF ON RWY 18L. WE DEPARTED ON THE SID TO THE W AND DIDN'T THINK ANYTHING OF IT TILL THE DFW TWR AROUND 3 HRS LATER CALLED US UP TO SAY THERE WAS CTLR TRAINING IN PROGRESS AND THAT THE INSTRUCTOR TRIED TO CANCEL OUR TKOF CLRNC. WE NOTIFIED THE TWR THAT WE NEVER RECEIVED NOR ACKNOWLEDGED A TKOF CANCELLATION. WE ALSO NOTIFIED THEM THAT WE HAD THE B757 IN SIGHT AT ALL TIMES. THEY SAID THERE WAS A SEPARATION PROB.

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.