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Aviation Safety Reporting System
|Local Time Of Day
|1801 To 2400
|intersection : corts
|msl single value : 10000
|tracon : d10.tracon
|common carrier : air carrier
|Make Model Name
|MD-80 Series (DC-9-80) Undifferentiated or Other Model
|Operating Under FAR Part
|Navigation In Use
|climbout : intermediate altitude
|Route In Use
|departure sid : bleco
|company : air carrier
|flight crew : captain
oversight : pic
|company : air carrier
|flight crew : first officer
|aircraft equipment problem : critical
other spatial deviation
|other flight crewa
|aircraft : equipment problem dissipated
controller : provided flight assist
controller : issued new clearance
flight crew : overrode automation
We were flying the BLECO2 departure. Somewhere between jgirl and corts intxns; the magenta course line disappeared and was replaced by two curved and crossed magenta course lines with the intersection of the lines about 4 miles in front of the aircraft. The aircraft simultaneously started a left turn to an unknown location. The first officer disconnected the autoplt while I was telling ATC that our FMS had failed. ATC gave us a heading and altitude and eventually asked if we could fly direct to bleco. A short time later; we found that we could fly to bleco and accepted the clearance from ATC. FMS operation was normal for the remainder of the flight.
Original NASA ASRS Text
Title: MD80 HAS MALFUNCTIONING FMS DURING BLECO RNAV SID FROM DFW.
Narrative: WE WERE FLYING THE BLECO2 DEP. SOMEWHERE BETWEEN JGIRL AND CORTS INTXNS; THE MAGENTA COURSE LINE DISAPPEARED AND WAS REPLACED BY TWO CURVED AND CROSSED MAGENTA COURSE LINES WITH THE INTXN OF THE LINES ABOUT 4 MILES IN FRONT OF THE ACFT. THE ACFT SIMULTANEOUSLY STARTED A L TURN TO AN UNKNOWN LOCATION. THE FO DISCONNECTED THE AUTOPLT WHILE I WAS TELLING ATC THAT OUR FMS HAD FAILED. ATC GAVE US A HDG AND ALT AND EVENTUALLY ASKED IF WE COULD FLY DIRECT TO BLECO. A SHORT TIME LATER; WE FOUND THAT WE COULD FLY TO BLECO AND ACCEPTED THE CLRNC FROM ATC. FMS OPERATION WAS NORMAL FOR THE REMAINDER OF THE FLT.
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.