MD80 on RNAV SID from dfw experiences FMS anomaly.

Attributes
ACN	684278
Time
Date	200601
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : ttt.vor
State Reference	TX
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d10.tracon
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : takeoff climbout : initial
Route In Use	departure sid : nobly
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	684278
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : fms warning other flight crewa
Resolutory Action	aircraft : equipment problem dissipated controller : issued new clearance
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

FMS and 'dead reckoning' message received. Declared 'RNAV SID unable.' received vectors from departure control. Message subsequently disappeared; accepted clearance direct to intersection.

Original NASA ASRS Text

Title: MD80 ON RNAV SID FROM DFW EXPERIENCES FMS ANOMALY.

Narrative: FMS AND 'DEAD RECKONING' MESSAGE RECEIVED. DECLARED 'RNAV SID UNABLE.' RECEIVED VECTORS FROM DEP CTL. MESSAGE SUBSEQUENTLY DISAPPEARED; ACCEPTED CLRNC DIRECT TO INTXN.

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.