B757 FMS equipment problem directed wrong turn to intercept departure SID at cvg.

Attributes
ACN	429820
Time
Date	199902
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : cvg.airport
State Reference	OH
Altitude	msl bound lower : 3000 msl bound upper : 8000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cvg.tracon
Operator	common carrier : air carrier
Make Model Name	B767-200
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors departure sid : blue grass
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 25000 flight time type : 1000
ASRS Report	429820
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe non adherence : far non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance controller : issued advisory flight crew : returned to original clearance
Supplementary
Problem Areas	Cabin Crew Human Performance Aircraft
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

While flying cvg runway 18L special departure procedure, departure control instructed flight to turn right 220 degrees, intercept blugrass departure. Captain was hand flying aircraft, FMS course appeared slightly right of aircraft. As aircraft was passing 200 degrees, first officer advised captain to turn back left to 170 degrees to reintercept course, as we had apparently flown through same. While in left turn, departure control asked our heading and instructed us to turn right to 220 degrees and intercept departure (as we were turning toward inbound traffic). When established in right turn, captain asked first officer to rechk VOR radial and engage autoplt. It appears that the FMS course was approximately 1-2 KM left of where it should have been.

Original NASA ASRS Text

Title: B757 FMS EQUIP PROB DIRECTED WRONG TURN TO INTERCEPT DEP SID AT CVG.

Narrative: WHILE FLYING CVG RWY 18L SPECIAL DEP PROC, DEP CTL INSTRUCTED FLT TO TURN R 220 DEGS, INTERCEPT BLUGRASS DEP. CAPT WAS HAND FLYING ACFT, FMS COURSE APPEARED SLIGHTLY R OF ACFT. AS ACFT WAS PASSING 200 DEGS, FO ADVISED CAPT TO TURN BACK L TO 170 DEGS TO REINTERCEPT COURSE, AS WE HAD APPARENTLY FLOWN THROUGH SAME. WHILE IN L TURN, DEP CTL ASKED OUR HDG AND INSTRUCTED US TO TURN R TO 220 DEGS AND INTERCEPT DEP (AS WE WERE TURNING TOWARD INBOUND TFC). WHEN ESTABLISHED IN R TURN, CAPT ASKED FO TO RECHK VOR RADIAL AND ENGAGE AUTOPLT. IT APPEARS THAT THE FMS COURSE WAS APPROX 1-2 KM L OF WHERE IT SHOULD HAVE BEEN.

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.