C525 flight crew has a track heading deviation on departure under N90 control.

Attributes
ACN	557940
Time
Date	200208
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : cmk.vor
State Reference	NY
Altitude	msl single value : 6000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90.tracon
Operator	general aviation : corporate
Make Model Name	Citationjet, C525/C526
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	climbout : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	controller radar : 20 flight time last 90 days : 200 flight time total : 6800 flight time type : 800
ASRS Report	557940
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other controllerb
Resolutory Action	controller : issued advisory controller : issued new clearance
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were cleared off danbury to the carmel VORTAC, then J39 mooni...etc. This gave us an acute turn, almost reversing course. The universal UNS1K was activated with the autoplt on. Because of the acute angle turn, the FMS began turning well before the cmk (carmel) VORTAC. ATC advised we were off course and gave us an immediate right turn. To avoid this, the FMS must be programmed with cmk as a flyover waypoint, not flyby.

Original NASA ASRS Text

Title: C525 FLC HAS A TRACK HEADING DEV ON DEP UNDER N90 CTL.

Narrative: WE WERE CLRED OFF DANBURY TO THE CARMEL VORTAC, THEN J39 MOONI...ETC. THIS GAVE US AN ACUTE TURN, ALMOST REVERSING COURSE. THE UNIVERSAL UNS1K WAS ACTIVATED WITH THE AUTOPLT ON. BECAUSE OF THE ACUTE ANGLE TURN, THE FMS BEGAN TURNING WELL BEFORE THE CMK (CARMEL) VORTAC. ATC ADVISED WE WERE OFF COURSE AND GAVE US AN IMMEDIATE R TURN. TO AVOID THIS, THE FMS MUST BE PROGRAMMED WITH CMK AS A FLYOVER WAYPOINT, NOT FLYBY.

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.