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Air carrier X climb to occupied altitude had less than standard separation from air carrier Y. Pilot deviation.
| Attributes | |
| ACN | 302550 |
| Time | |
| Date | 199504 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : lyh |
| State Reference | VA |
| Altitude | msl bound lower : 24000 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| 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 : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 12000 flight time type : 1200 |
| ASRS Report | 302550 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : required legal separation |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 12000 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X was cleared to FL240 and told 'traffic at FL240, upon clearing, higher available.' arriving at FL240 was asked 'what altitude were you assigned?' to which we answered 'FL240.' TCASII indicated (no alerts) air carrier Y at FL240 within estimated 2 mi passing to our left rear eastbound. We are wbound. No other xmissions occurred concerning the above. We were either cleared in error or misunderstood the clearance to FL240 with traffic call at FL240. Procedures provide PNF set and PF confirm altitude settings. But, there was only 2 of us and we both misunderstood, or didn't see strange clearance and traffic call at same altitude.
Original NASA ASRS Text
Title: ACR X CLB TO OCCUPIED ALT HAD LTSS FROM ACR Y. PLTDEV.
Narrative: ACR X WAS CLRED TO FL240 AND TOLD 'TFC AT FL240, UPON CLRING, HIGHER AVAILABLE.' ARRIVING AT FL240 WAS ASKED 'WHAT ALT WERE YOU ASSIGNED?' TO WHICH WE ANSWERED 'FL240.' TCASII INDICATED (NO ALERTS) ACR Y AT FL240 WITHIN ESTIMATED 2 MI PASSING TO OUR L REAR EBOUND. WE ARE WBOUND. NO OTHER XMISSIONS OCCURRED CONCERNING THE ABOVE. WE WERE EITHER CLRED IN ERROR OR MISUNDERSTOOD THE CLRNC TO FL240 WITH TFC CALL AT FL240. PROCS PROVIDE PNF SET AND PF CONFIRM ALT SETTINGS. BUT, THERE WAS ONLY 2 OF US AND WE BOTH MISUNDERSTOOD, OR DIDN'T SEE STRANGE CLRNC AND TFC CALL AT SAME ALT.
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.