DC9 crew had track deviation departing dfw.

Attributes
ACN	467248
Time
Date	200003
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Environment
Flight Conditions	VMC
Weather Elements	Thunderstorm
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dfw.tower
Operator	common carrier : air carrier
Make Model Name	DC-9 30
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Route In Use	departure sid : dfw 5
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 15000 flight time type : 2800
ASRS Report	467284
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : far non adherence : published procedure other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

When cleared for takeoff on runway 17R at dfw the tower stated '100 at 17 cleared for takeoff.' I read back 'left 100, cleared for takeoff runway 17R.' departure controller questioned our heading and said the tower did not give the 100 degree heading. The SID called for 174 degree heading which would have placed us in WX. We thought the 'turn' was to avoid thunderstorm cells. Apparently, what I misheard was the wind readout of '100 degrees at 17 KTS.' what I heard was: '1-0-0, 1-7 cleared for takeoff.' I thought he said '100 degree heading' and runway 17R cleared for takeoff. Callback conversation with reporter revealed the following information: crew was flying a DC9-30. Both crew members did not hear any reference to 'wind' mentioned. Since there were thunderstorms immediately south of the airport it seemed the thing to do was turn to avoid them. The clearance they thought did just that. The tower local controller did not correct the readback.

Original NASA ASRS Text

Title: DC9 CREW HAD TRACK DEV DEPARTING DFW.

Narrative: WHEN CLRED FOR TKOF ON RWY 17R AT DFW THE TWR STATED '100 AT 17 CLRED FOR TKOF.' I READ BACK 'LEFT 100, CLRED FOR TKOF RWY 17R.' DEP CTLR QUESTIONED OUR HEADING AND SAID THE TWR DID NOT GIVE THE 100 DEG HDG. THE SID CALLED FOR 174 DEG HDG WHICH WOULD HAVE PLACED US IN WX. WE THOUGHT THE 'TURN' WAS TO AVOID TSTM CELLS. APPARENTLY, WHAT I MISHEARD WAS THE WIND READOUT OF '100 DEGS AT 17 KTS.' WHAT I HEARD WAS: '1-0-0, 1-7 CLRED FOR TKOF.' I THOUGHT HE SAID '100 DEG HDG' AND RWY 17R CLRED FOR TKOF. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CREW WAS FLYING A DC9-30. BOTH CREW MEMBERS DID NOT HEAR ANY REF TO 'WIND' MENTIONED. SINCE THERE WERE TSTMS IMMEDIATELY S OF THE ARPT IT SEEMED THE THING TO DO WAS TURN TO AVOID THEM. THE CLRNC THEY THOUGHT DID JUST THAT. THE TWR LCL CTLR DID NOT CORRECT THE READBACK.

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.