MD83 crew had a track deviation while flying an RNAV departure at las.

Attributes
ACN	567119
Time
Date	200212
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : las.airport
State Reference	NV
Altitude	agl single value : 2000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : l30.tracon tower : geg.tower
Operator	common carrier : air carrier
Make Model Name	MD-83
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude climbout : initial
Route In Use	departure sid : idale
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : flight engineer pilot : atp pilot : cfi pilot : commercial
Experience	flight time last 90 days : 180 flight time total : 5900 flight time type : 400
ASRS Report	567119
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	non adherence : clearance non adherence : published procedure non adherence : far other spatial deviation
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Aircraft Company Flight Crew Human Performance FAA
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

The aircraft made an early left turn while executing the idale departure after the autoplt was selected 'on' shortly after takeoff. The captain's flight director failed and the first officer's FMS matched the captain's FMS. However, the aircraft did not continue to fly to the first waypoint and turned to the south too early. When the captain's flight director failed, the aircraft should have been flown in heading select until the problem could have been idented.

Original NASA ASRS Text

Title: MD83 CREW HAD A TRACK DEV WHILE FLYING AN RNAV DEP AT LAS.

Narrative: THE ACFT MADE AN EARLY L TURN WHILE EXECUTING THE IDALE DEP AFTER THE AUTOPLT WAS SELECTED 'ON' SHORTLY AFTER TKOF. THE CAPT'S FLT DIRECTOR FAILED AND THE FO'S FMS MATCHED THE CAPT'S FMS. HOWEVER, THE ACFT DID NOT CONTINUE TO FLY TO THE FIRST WAYPOINT AND TURNED TO THE S TOO EARLY. WHEN THE CAPT'S FLT DIRECTOR FAILED, THE ACFT SHOULD HAVE BEEN FLOWN IN HDG SELECT UNTIL THE PROB COULD HAVE BEEN IDENTED.

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.