Clearance reply to wrong call sign - another air carrier answered the reporter's clearance from TRACON and started to perform the maneuver, but the various parties straightened everything out before harm was done.

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Attributes
ACN	300880
Time
Date	199504
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : mqp airport : dfw
State Reference	TX
Altitude	msl bound lower : 11000 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw tower : fxe
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 189 flight time total : 9047 flight time type : 4125
ASRS Report	300880
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 180 flight time total : 15000 flight time type : 6000
ASRS Report	300869
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	other controllera other flight crewa other other : unspecified
Resolutory Action	other other
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

On departure from dfw runway 18L, heading 180 degrees, climbing to 10000 ft, departure control turned us call sign XXXA to a heading of 270 degrees. Then we were told to level at 9000 ft. We then all heard 'call sign XXXA, climb to 17000 ft.' I set in 17000 ft in the altitude reminder and began a climb to 17000 ft after the captain read back 'call sign XXXA climb to 17000 ft.' as we started our climb through 10000 ft, call sign flight #XXXB told departure that another flight may have acknowledged their clearance. Departure then cleared call sign XXXA to 17000 ft, expedite through 12000 ft. Traffic 10 O'clock, 06 mi. The captain checked the TCASII, visually acquired the traffic and we expedited through 12000 ft as instructed. TCASII gave no TA or RA and there was never a conflict. The readback of the captain was most probably blocked by call sign XXXB's readback, but his call to departure alerted us all.

Original NASA ASRS Text

Title: CLRNC REPLY TO WRONG CALL SIGN - ANOTHER ACR ANSWERED THE RPTR'S CLRNC FROM TRACON AND STARTED TO PERFORM THE MANEUVER, BUT THE VARIOUS PARTIES STRAIGHTENED EVERYTHING OUT BEFORE HARM WAS DONE.

Narrative: ON DEP FROM DFW RWY 18L, HDG 180 DEGS, CLBING TO 10000 FT, DEP CTL TURNED US CALL SIGN XXXA TO A HDG OF 270 DEGS. THEN WE WERE TOLD TO LEVEL AT 9000 FT. WE THEN ALL HEARD 'CALL SIGN XXXA, CLB TO 17000 FT.' I SET IN 17000 FT IN THE ALT REMINDER AND BEGAN A CLB TO 17000 FT AFTER THE CAPT READ BACK 'CALL SIGN XXXA CLB TO 17000 FT.' AS WE STARTED OUR CLB THROUGH 10000 FT, CALL SIGN FLT #XXXB TOLD DEP THAT ANOTHER FLT MAY HAVE ACKNOWLEDGED THEIR CLRNC. DEP THEN CLRED CALL SIGN XXXA TO 17000 FT, EXPEDITE THROUGH 12000 FT. TFC 10 O'CLOCK, 06 MI. THE CAPT CHKED THE TCASII, VISUALLY ACQUIRED THE TFC AND WE EXPEDITED THROUGH 12000 FT AS INSTRUCTED. TCASII GAVE NO TA OR RA AND THERE WAS NEVER A CONFLICT. THE READBACK OF THE CAPT WAS MOST PROBABLY BLOCKED BY CALL SIGN XXXB'S READBACK, BUT HIS CALL TO DEP ALERTED US ALL.

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.