B757-200 departing dfw is challenged by ATC regarding assigned speed.

Attributes
ACN	585920
Time
Date	200306
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	msl single value : 29000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zfw.artcc
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : vacating altitude climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	585920
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	585916
Events
Anomaly	non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance controller : issued advisory
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

During climb out ZFW controller on 127.0 told us to maintain 300 KTS. We acknowledged and flew 300 KTS exactly. After a few mins, controller asked us what our speed was. Captain responded 300 KTS assigned. A few more mins passed and the controller called again and said that we were overtaking another aircraft by 30 KTS and that we had indicated to him in our earlier conversation that we were flying 305 KTS. Captain again stated that we were flying 300 KTS and that he must have misunderstood our earlier statement. I was flying the aircraft and had selected the speed on the mode control panel. The aircraft was flying 300 KTS -- period. The upset controller asked us to switch frequency and asked us to call his supervisor on the telephone about a pilot violation when we landed. We called and talked to his supervisor about our speed statement. He said he was just trying to get our side of the story. He said he did not plan on filing anything. I asked him if he had access to the voice tapes. He said he did. I asked him to review the tapes, for I had confidence in what we had stipulated. I asked him to call me if any part of my story did not prove out. He said he would. So far no call.

Original NASA ASRS Text

Title: B757-200 DEPARTING DFW IS CHALLENGED BY ATC REGARDING ASSIGNED SPD.

Narrative: DURING CLBOUT ZFW CTLR ON 127.0 TOLD US TO MAINTAIN 300 KTS. WE ACKNOWLEDGED AND FLEW 300 KTS EXACTLY. AFTER A FEW MINS, CTLR ASKED US WHAT OUR SPD WAS. CAPT RESPONDED 300 KTS ASSIGNED. A FEW MORE MINS PASSED AND THE CTLR CALLED AGAIN AND SAID THAT WE WERE OVERTAKING ANOTHER ACFT BY 30 KTS AND THAT WE HAD INDICATED TO HIM IN OUR EARLIER CONVERSATION THAT WE WERE FLYING 305 KTS. CAPT AGAIN STATED THAT WE WERE FLYING 300 KTS AND THAT HE MUST HAVE MISUNDERSTOOD OUR EARLIER STATEMENT. I WAS FLYING THE ACFT AND HAD SELECTED THE SPD ON THE MODE CTL PANEL. THE ACFT WAS FLYING 300 KTS -- PERIOD. THE UPSET CTLR ASKED US TO SWITCH FREQ AND ASKED US TO CALL HIS SUPVR ON THE TELEPHONE ABOUT A PLT VIOLATION WHEN WE LANDED. WE CALLED AND TALKED TO HIS SUPVR ABOUT OUR SPD STATEMENT. HE SAID HE WAS JUST TRYING TO GET OUR SIDE OF THE STORY. HE SAID HE DID NOT PLAN ON FILING ANYTHING. I ASKED HIM IF HE HAD ACCESS TO THE VOICE TAPES. HE SAID HE DID. I ASKED HIM TO REVIEW THE TAPES, FOR I HAD CONFIDENCE IN WHAT WE HAD STIPULATED. I ASKED HIM TO CALL ME IF ANY PART OF MY STORY DID NOT PROVE OUT. HE SAID HE WOULD. SO FAR NO CALL.

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.