A319 crew makes a wrong turn on departure after being given an amended clearance during takeoff roll...

Attributes
ACN	449880
Time
Date	199909
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : pxr.vortac
State Reference	AZ
Altitude	msl bound lower : 4000 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : p50.tracon
Operator	common carrier : air carrier
Make Model Name	A319
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : initial
Route In Use	departure sid : dryht1.dryht
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp
Experience	flight time last 90 days : 75 flight time total : 12300 flight time type : 450
ASRS Report	449880
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other controllerb
Resolutory Action	controller : issued new clearance flight crew : returned to original clearance
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On our takeoff roll from runway 8R in phx, tower gave us an amended clearance to fly heading 095 degrees at the 4 DME east of pxr. We were flying the DRYHT1.dryht SID. We understood the clearance to be heading 195 degrees at the 4 DME, which seemed correct because the SID is to fly a 190 degree heading. When we were turning through about 140-150 degrees, the controller asked, were we on a heading of 095 degrees, and then told us to turn to the 095 degree heading. We proceeded on without further incident. This misunderstanding arose when we got a clearance during a critical phase of flight. We were also expecting to fly the SID. It would help if these clrncs were not given at such a rushed time.

Original NASA ASRS Text

Title: A319 CREW MAKES A WRONG TURN ON DEP AFTER BEING GIVEN AN AMENDED CLRNC DURING TKOF ROLL.

Narrative: ON OUR TKOF ROLL FROM RWY 8R IN PHX, TWR GAVE US AN AMENDED CLRNC TO FLY HDG 095 DEGS AT THE 4 DME E OF PXR. WE WERE FLYING THE DRYHT1.DRYHT SID. WE UNDERSTOOD THE CLRNC TO BE HDG 195 DEGS AT THE 4 DME, WHICH SEEMED CORRECT BECAUSE THE SID IS TO FLY A 190 DEG HDG. WHEN WE WERE TURNING THROUGH ABOUT 140-150 DEGS, THE CTLR ASKED, WERE WE ON A HDG OF 095 DEGS, AND THEN TOLD US TO TURN TO THE 095 DEG HDG. WE PROCEEDED ON WITHOUT FURTHER INCIDENT. THIS MISUNDERSTANDING AROSE WHEN WE GOT A CLRNC DURING A CRITICAL PHASE OF FLT. WE WERE ALSO EXPECTING TO FLY THE SID. IT WOULD HELP IF THESE CLRNCS WERE NOT GIVEN AT SUCH A RUSHED TIME.

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.