<< >> NASA ASRS Report 687213, February 2006

E140 flight crew is surprised when the aircraft turns 30 degrees off the FMC course approaching lit on the nobly RNAV SID; little rock transition from dfw.

Attributes
ACN	687213
Time
Date	200602
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	msl single value : 7000
Aircraft 1
Controlling Facilities	tracon : d10.tracon
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 140 ER&LR
Operating Under FAR Part	Part 121
Navigation In Use	other other vortac
Flight Phase	climbout : initial
Route In Use	departure sid : nobly 2
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	687213
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure non adherence : clearance other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended or assigned course
Consequence	other
Supplementary
Problem Areas	Aircraft Chart Or Publication Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

Approximately 8 NM from the lit VORTAC -- with clearance direct to VORTAC followed by heading 050 degrees following VORTAC passage. Aircraft was using FMS for navigation -- and was properly sequenced to lit VORTAC as the required fix. Without input from the crew; the aircraft turned approximately 30 degrees to the right -- away from the VORTAC. Crew intervened and disengaged autoplt and proceeded back to VORTAC. Routing was to lit via the nobly 2 departure from dfw. Both crewmembers had noted this anomaly before on this route approaching lit -- on different dates and in different aircraft.

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Original NASA ASRS Text

Title: E140 FLT CREW IS SURPRISED WHEN THE ACFT TURNS 30 DEGS OFF THE FMC COURSE APCHING LIT ON THE NOBLY RNAV SID; LITTLE ROCK TRANSITION FROM DFW.

Narrative: APPROX 8 NM FROM THE LIT VORTAC -- WITH CLRNC DIRECT TO VORTAC FOLLOWED BY HEADING 050 DEGS FOLLOWING VORTAC PASSAGE. ACFT WAS USING FMS FOR NAV -- AND WAS PROPERLY SEQUENCED TO LIT VORTAC AS THE REQUIRED FIX. WITHOUT INPUT FROM THE CREW; THE ACFT TURNED APPROX 30 DEGS TO THE R -- AWAY FROM THE VORTAC. CREW INTERVENED AND DISENGAGED AUTOPLT AND PROCEEDED BACK TO VORTAC. ROUTING WAS TO LIT VIA THE NOBLY 2 DEP FROM DFW. BOTH CREWMEMBERS HAD NOTED THIS ANOMALY BEFORE ON THIS RTE APCHING LIT -- ON DIFFERENT DATES AND IN DIFFERENT ACFT.

Data retrieved from NASA's ASRS site as of January 2009 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.