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An oceanic air carrier flight in non radar coverage airspace reported in at FL340. The flight progress strip indicated the assigned altitude as FL310. The controller did not catch the error until later. Another aircraft in the area was also maintaining FL340.
| Attributes | |
| ACN | 383425 |
| Time | |
| Date | 199710 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : yyt |
| State Reference | NF |
| Altitude | msl bound lower : 31000 msl bound upper : 34000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : atlantic |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : atlantic |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : non radar |
| Qualification | controller : radar |
| Experience | controller non radar : 3 controller radar : 1 |
| ASRS Report | 383425 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Miss Distance | horizontal : 99999 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 progress 46/40 at XA10 at FL340 the flight progress strip was marked at FL310. The controller did not catch the altitude discrepancy. That problem was either gander center gave us the aircraft at the wrong altitude or the ZNY controller took an altitude revision but didn't write it on the strip. The error was caught when the 50 mi west progress report was taken. After it was determined that aircraft #1 was at FL340. It was a possible separation error with aircraft #2. Aircraft #1 passed 46/40 XA10, EST 40/50 XB22, FL340. Aircraft #2 passed 45/40 XA32, EST 43/50 XB31, FL340. If these 2 aircraft had the required 15 mins where they crossed, it was by accident.
Original NASA ASRS Text
Title: AN OCEANIC ACR FLT IN NON RADAR COVERAGE AIRSPACE RPTED IN AT FL340. THE FLT PROGRESS STRIP INDICATED THE ASSIGNED ALT AS FL310. THE CTLR DID NOT CATCH THE ERROR UNTIL LATER. ANOTHER ACFT IN THE AREA WAS ALSO MAINTAINING FL340.
Narrative: ACFT #1 PROGRESS 46/40 AT XA10 AT FL340 THE FLT PROGRESS STRIP WAS MARKED AT FL310. THE CTLR DID NOT CATCH THE ALT DISCREPANCY. THAT PROB WAS EITHER GANDER CTR GAVE US THE ACFT AT THE WRONG ALT OR THE ZNY CTLR TOOK AN ALT REVISION BUT DIDN'T WRITE IT ON THE STRIP. THE ERROR WAS CAUGHT WHEN THE 50 MI W PROGRESS RPT WAS TAKEN. AFTER IT WAS DETERMINED THAT ACFT #1 WAS AT FL340. IT WAS A POSSIBLE SEPARATION ERROR WITH ACFT #2. ACFT #1 PASSED 46/40 XA10, EST 40/50 XB22, FL340. ACFT #2 PASSED 45/40 XA32, EST 43/50 XB31, FL340. IF THESE 2 ACFT HAD THE REQUIRED 15 MINS WHERE THEY CROSSED, IT WAS BY ACCIDENT.
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.