MD80 flight crew has minor track deviation on CLARE2 RNAV SID when autoplt reverts to 'heading hold' vice navigation trak mode approaching mechl waypoint.

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Attributes
ACN	696484
Time
Date	200605
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	msl single value : 5000
Environment
Light	Dawn
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
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain
ASRS Report	696484
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : less severe other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued advisory flight crew : overcame equipment problem flight crew : returned to intended or assigned course
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft Chart Or Publication
Primary Problem	Aircraft

Narrative:

We were doing the CLARE2 departure out of dfw departing on runway 35L. After takeoff in navigation trk and with the autplt on; 230 KTS; 500 ft at mechl; the autoplt went to 'heading hold.' we noticed it right away and corrected manually to get back on track. The GPS showed us 1 mile off course and ATC asked us about the turn. Within one minute we were back on track. After talking to ATC they told us that a B757 had the same thing happen to them just a few minutes earlier. No conflict was noticed.

Original NASA ASRS Text

Title: MD80 FLT CREW HAS MINOR TRACK DEV ON CLARE2 RNAV SID WHEN AUTOPLT REVERTS TO 'HDG HOLD' VICE NAV TRAK MODE APCHING MECHL WAYPOINT.

Narrative: WE WERE DOING THE CLARE2 DEP OUT OF DFW DEPARTING ON RWY 35L. AFTER TKOF IN NAV TRK AND WITH THE AUTPLT ON; 230 KTS; 500 FT AT MECHL; THE AUTOPLT WENT TO 'HDG HOLD.' WE NOTICED IT RIGHT AWAY AND CORRECTED MANUALLY TO GET BACK ON TRACK. THE GPS SHOWED US 1 MILE OFF COURSE AND ATC ASKED US ABOUT THE TURN. WITHIN ONE MINUTE WE WERE BACK ON TRACK. AFTER TALKING TO ATC THEY TOLD US THAT A B757 HAD THE SAME THING HAPPEN TO THEM JUST A FEW MINUTES EARLIER. NO CONFLICT WAS NOTICED.

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.