CL601 flight crew experiences error with FMS on departure resulting in course deviation.

Attributes
ACN	571353
Time
Date	200301
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : pom.vortac
State Reference	CA
Altitude	msl bound lower : 9300 msl bound upper : 14000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	general aviation : corporate
Make Model Name	Challenger CL601
Operating Under FAR Part	Part 91
Navigation In Use	other
Route In Use	departure sid : pomona six
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 8500 flight time type : 2000
ASRS Report	571353
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance non adherence : published procedure other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued advisory flight crew : overcame equipment problem flight crew : returned to intended or assigned course flight crew : returned to original clearance
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance Chart Or Publication
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Departing ont on pomona 6 departure, climbing to 14000 ft, FMS changed to direct daggett instead of tracking to pomona and flying outbound 301 degree radial. Controller (lax) questioned turns and direction aircraft was flying. Crew asked ATC for turn (heading) and was told to fly pomona 6 departure. Crew then began checking position via navigation radials and DME. ATC then gave crew a 280 degree heading to get re-established on departure. Crew re-entered waypoints on departure and flew transition to daggett. Crew thought ATC could be more helpful in this situation.

Original NASA ASRS Text

Title: CL601 FLC EXPERIENCES ERROR WITH FMS ON DEP RESULTING IN COURSE DEV.

Narrative: DEPARTING ONT ON POMONA 6 DEP, CLBING TO 14000 FT, FMS CHANGED TO DIRECT DAGGETT INSTEAD OF TRACKING TO POMONA AND FLYING OUTBOUND 301 DEG RADIAL. CTLR (LAX) QUESTIONED TURNS AND DIRECTION ACFT WAS FLYING. CREW ASKED ATC FOR TURN (HDG) AND WAS TOLD TO FLY POMONA 6 DEP. CREW THEN BEGAN CHKING POS VIA NAV RADIALS AND DME. ATC THEN GAVE CREW A 280 DEG HDG TO GET RE-ESTABLISHED ON DEP. CREW RE-ENTERED WAYPOINTS ON DEP AND FLEW TRANSITION TO DAGGETT. CREW THOUGHT ATC COULD BE MORE HELPFUL IN THIS SIT.

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.