L1011 on sinca 3 STAR failed to make 12000 ft crossing at canuk. FMS had checked within 2 mi when programmed at fll, but now indicated 26 mi to canuk. ZTL advised flight was over canuk and issued 360 degree turn to get down. Checking VOR DME confirmed error in FMS. Reset navigation and waypoint page on FMS and it immediately corrected.

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Attributes
ACN	355313
Time
Date	199612
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : atl
State Reference	GA
Altitude	msl bound lower : 12000 msl bound upper : 17000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : atl
Operator	common carrier : air carrier
Make Model Name	L-1011-1 100/200/250
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent other
Route In Use	arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : private pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 150 flight time total : 21000 flight time type : 4000
ASRS Report	355313
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : instrument pilot : commercial pilot : flight engineer pilot : private
Experience	flight time last 90 days : 210 flight time total : 10000 flight time type : 3000
ASRS Report	355315
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : crossing restriction not met non adherence : clearance non adherence : far non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

First officer flying leg. My attention was diverted to discussing write- up with so, heard center call concerning crossing restr (12000 ft) at canuk (inbound on STAR in atl). His reply was that we will be able to make restr. I immediately checked DME on FMS and saw that we were still 26 DME from canuk at 17000 ft. Also switched to atl VOR and verified 40 DME (we were in fact at canuk). FMS was in error and was undetected prior to that point. We were given a 360 degree right descending turn with no 'deals' (traffic conflicts). I reset navigation and waypoint page on FMS and it instantly showed the proper DME (40). Both of us checked mileage after loading FMS in fll and was within 2 mi of flight plan (we noted this on flight plan). ATC was queried and stated no traffic conflicts. FMS entered in logbook with no explanation as to why this happened.

Original NASA ASRS Text

Title: L1011 ON SINCA 3 STAR FAILED TO MAKE 12000 FT XING AT CANUK. FMS HAD CHKED WITHIN 2 MI WHEN PROGRAMMED AT FLL, BUT NOW INDICATED 26 MI TO CANUK. ZTL ADVISED FLT WAS OVER CANUK AND ISSUED 360 DEG TURN TO GET DOWN. CHKING VOR DME CONFIRMED ERROR IN FMS. RESET NAV AND WAYPOINT PAGE ON FMS AND IT IMMEDIATELY CORRECTED.

Narrative: FO FLYING LEG. MY ATTN WAS DIVERTED TO DISCUSSING WRITE- UP WITH SO, HEARD CTR CALL CONCERNING XING RESTR (12000 FT) AT CANUK (INBOUND ON STAR IN ATL). HIS REPLY WAS THAT WE WILL BE ABLE TO MAKE RESTR. I IMMEDIATELY CHKED DME ON FMS AND SAW THAT WE WERE STILL 26 DME FROM CANUK AT 17000 FT. ALSO SWITCHED TO ATL VOR AND VERIFIED 40 DME (WE WERE IN FACT AT CANUK). FMS WAS IN ERROR AND WAS UNDETECTED PRIOR TO THAT POINT. WE WERE GIVEN A 360 DEG R DSNDING TURN WITH NO 'DEALS' (TFC CONFLICTS). I RESET NAV AND WAYPOINT PAGE ON FMS AND IT INSTANTLY SHOWED THE PROPER DME (40). BOTH OF US CHKED MILEAGE AFTER LOADING FMS IN FLL AND WAS WITHIN 2 MI OF FLT PLAN (WE NOTED THIS ON FLT PLAN). ATC WAS QUERIED AND STATED NO TFC CONFLICTS. FMS ENTERED IN LOGBOOK WITH NO EXPLANATION AS TO WHY THIS HAPPENED.

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.