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Flight crew of a lockheed 1011 tri-STAR failed to make crossing restr during a STAR arrival due to a data shift by the FMS.
| Attributes | |
| ACN | 420090 |
| Time | |
| Date | 199811 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : atl airport : atl |
| State Reference | GA |
| Altitude | msl bound lower : 12000 msl bound upper : 12500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star enroute airway : atl |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 180 flight time total : 22000 flight time type : 1500 |
| ASRS Report | 420090 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : instrument pilot : flight engineer |
| Experience | flight time last 90 days : 210 flight time total : 10000 flight time type : 450 |
| ASRS Report | 419850 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : crossing restriction not met altitude deviation : undershoot non adherence : clearance |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On descent into atl on the sinca 3 arrival, we received clearance to cross canuk at 12000 ft and 250 KTS. Copilot was using FMS for navigation. At 13 NM from canuk (FMS) the aircraft was 250 KTS and descending through 13000 ft at 1500 FPM. Controller asked if we would make restr. As I was answering affirmative the FMS data shifted to 3 NM 'to' canuk then 'from' canuk in a 5-10 second time frame. We reached 12000 ft 3 NM past canuk. I have never observed a data shift on the L1011 in 2 yrs of flying it. To prevent situation in future, one pilot could go to manual VOR for the entire descent.
Original NASA ASRS Text
Title: FLC OF A LOCKHEED 1011 TRI-STAR FAILED TO MAKE XING RESTR DURING A STAR ARR DUE TO A DATA SHIFT BY THE FMS.
Narrative: ON DSCNT INTO ATL ON THE SINCA 3 ARR, WE RECEIVED CLRNC TO CROSS CANUK AT 12000 FT AND 250 KTS. COPLT WAS USING FMS FOR NAV. AT 13 NM FROM CANUK (FMS) THE ACFT WAS 250 KTS AND DSNDING THROUGH 13000 FT AT 1500 FPM. CTLR ASKED IF WE WOULD MAKE RESTR. AS I WAS ANSWERING AFFIRMATIVE THE FMS DATA SHIFTED TO 3 NM 'TO' CANUK THEN 'FROM' CANUK IN A 5-10 SECOND TIME FRAME. WE REACHED 12000 FT 3 NM PAST CANUK. I HAVE NEVER OBSERVED A DATA SHIFT ON THE L1011 IN 2 YRS OF FLYING IT. TO PREVENT SIT IN FUTURE, ONE PLT COULD GO TO MANUAL VOR FOR THE ENTIRE DSCNT.
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.