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Air carrier X same altitude assigned had less than standard separation from air carrier Y. System error. Evasive action taken.
| Attributes | |
| ACN | 243636 |
| Time | |
| Date | 199305 |
| Day | Sun |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : man |
| State Reference | FO |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : pub |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute : other oceanic enroute : atlantic enroute airway : sbmu |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 4 Turbojet Eng |
| 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 : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 3400 flight time type : 200 |
| ASRS Report | 243636 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 99999 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier Y on our airway was apparently given clearance to same altitude as air carrier X (northbound). Area is not radar controled and has spotty VHF and HF ATC coverage. We relayed the sbound air carrier Y position report for him due to poor VHF/HF reception. Realized we had both been given FL310 and we visually saw each other at least 50 mi out with landing lights. Before ATC could straighten situation out, air carrier X climbed to FL320 while air carrier Y descended to FL300 with no other traffic between us. Passed safely laterally and horizontally, both visually and on TCASII. Relayed this to ATC, who cleared us to proper altitudes once we assured him we were both clear.
Original NASA ASRS Text
Title: ACR X SAME ALT ASSIGNED HAD LTSS FROM ACR Y. SYS ERROR. EVASIVE ACTION TAKEN.
Narrative: ACR Y ON OUR AIRWAY WAS APPARENTLY GIVEN CLRNC TO SAME ALT AS ACR X (NBOUND). AREA IS NOT RADAR CTLED AND HAS SPOTTY VHF AND HF ATC COVERAGE. WE RELAYED THE SBOUND ACR Y POS RPT FOR HIM DUE TO POOR VHF/HF RECEPTION. REALIZED WE HAD BOTH BEEN GIVEN FL310 AND WE VISUALLY SAW EACH OTHER AT LEAST 50 MI OUT WITH LNDG LIGHTS. BEFORE ATC COULD STRAIGHTEN SIT OUT, ACR X CLBED TO FL320 WHILE ACR Y DSNDED TO FL300 WITH NO OTHER TFC BTWN US. PASSED SAFELY LATERALLY AND HORIZLY, BOTH VISUALLY AND ON TCASII. RELAYED THIS TO ATC, WHO CLRED US TO PROPER ALTS ONCE WE ASSURED HIM WE WERE BOTH CLR.
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.