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Aircraft equipment problem. Air carrier return land when the INS system error was 15 mi south of course just after coastout.
| Attributes | |
| ACN | 299228 |
| Time | |
| Date | 199503 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : yqx |
| State Reference | NF |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : czqx tower : dtw |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 30 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : other oceanic enroute : atlantic |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : instrument pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 25 flight time total : 18000 flight time type : 2500 |
| ASRS Report | 299228 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : commercial pilot : atp pilot : instrument pilot : flight engineer |
| Experience | flight time last 90 days : 105 flight time total : 7238 flight time type : 230 |
| ASRS Report | 299224 |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : became reoriented other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Approximately 15 mins after coastout from gander VOR we were advised by gander center that we showed, on radar, to be 15 NM right of course and to turn left 20 degrees until back on centerline. After correcting back to what they said was on centerline, all 3 of our INS's showed us to be 15 mi left of course. We double-checked all waypoint coordinates and present position and could not determine what the problem was. At that time I decided not to make the crossing and returned to newark.
Original NASA ASRS Text
Title: ACFT EQUIP PROB. ACR RETURN LAND WHEN THE INS SYS ERROR WAS 15 MI S OF COURSE JUST AFTER COASTOUT.
Narrative: APPROX 15 MINS AFTER COASTOUT FROM GANDER VOR WE WERE ADVISED BY GANDER CTR THAT WE SHOWED, ON RADAR, TO BE 15 NM R OF COURSE AND TO TURN L 20 DEGS UNTIL BACK ON CTRLINE. AFTER CORRECTING BACK TO WHAT THEY SAID WAS ON CTRLINE, ALL 3 OF OUR INS'S SHOWED US TO BE 15 MI L OF COURSE. WE DOUBLE-CHKED ALL WAYPOINT COORDINATES AND PRESENT POS AND COULD NOT DETERMINE WHAT THE PROB WAS. AT THAT TIME I DECIDED NOT TO MAKE THE XING AND RETURNED TO NEWARK.
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.