Flight crew didn't understand that a change had been inserted into their pre departure clearance. Assuming that they were cleared as per their flight plan forecast they commenced a wrong turn after takeoff which was caught by departure control who gave them the proper clearance.

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Attributes
ACN	333572
Time
Date	199604
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : las
State Reference	NV
Altitude	msl bound lower : 9000 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : las
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude climbout : initial ground : preflight
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 100 flight time total : 8000 flight time type : 4000
ASRS Report	333572
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 12000 flight time type : 1400
ASRS Report	333573
Events
Anomaly	non adherence : published procedure non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Company flight plan forecast showed mead 1 departure. Picked up pre departure clearance on very short turn and briefed mead 1. On takeoff and switching to departure control, was asked if we were in right turn. Said yes and controller asked if tower gave us right turn. Didn't remember anything except 'cleared for takeoff.' upon rechking pre departure clearance, saw that departure had been changed to oasis 1 departure. Was wondering how we could go direct gfd when not on mead 1 SID. Pre departure clearance's need to show changes more clearly or eliminate previous clrncs totally to help avoid confusion. More attention should be paid by crews even with heavy workloads.

Original NASA ASRS Text

Title: FLC DIDN'T UNDERSTAND THAT A CHANGE HAD BEEN INSERTED INTO THEIR PDC. ASSUMING THAT THEY WERE CLRED AS PER THEIR FLT PLAN FORECAST THEY COMMENCED A WRONG TURN AFTER TKOF WHICH WAS CAUGHT BY DEP CTL WHO GAVE THEM THE PROPER CLRNC.

Narrative: COMPANY FLT PLAN FORECAST SHOWED MEAD 1 DEP. PICKED UP PDC ON VERY SHORT TURN AND BRIEFED MEAD 1. ON TKOF AND SWITCHING TO DEP CTL, WAS ASKED IF WE WERE IN R TURN. SAID YES AND CTLR ASKED IF TWR GAVE US R TURN. DIDN'T REMEMBER ANYTHING EXCEPT 'CLRED FOR TKOF.' UPON RECHKING PDC, SAW THAT DEP HAD BEEN CHANGED TO OASIS 1 DEP. WAS WONDERING HOW WE COULD GO DIRECT GFD WHEN NOT ON MEAD 1 SID. PDC'S NEED TO SHOW CHANGES MORE CLRLY OR ELIMINATE PREVIOUS CLRNCS TOTALLY TO HELP AVOID CONFUSION. MORE ATTN SHOULD BE PAID BY CREWS EVEN WITH HVY WORKLOADS.

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.