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Reported loss of separation when an air carrier B757 overshot assigned altitude and conflicted with an air carrier MD80 at FL260.
| Attributes | |
| ACN | 399260 |
| Time | |
| Date | 199803 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : mol |
| State Reference | VA |
| Altitude | msl bound lower : 26000 msl bound upper : 26000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc tower : dca |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar pilot : private pilot : instrument |
| Experience | controller radar : 6 flight time total : 250 |
| ASRS Report | 399260 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Miss Distance | horizontal : 24000 vertical : 600 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
The B757 climbed through the assigned altitude. The mode C indicated 400 ft high. I alerted the pilot and he descended. I don't know why this happened.
Original NASA ASRS Text
Title: RPTED LOSS OF SEPARATION WHEN AN ACR B757 OVERSHOT ASSIGNED ALT AND CONFLICTED WITH AN ACR MD80 AT FL260.
Narrative: THE B757 CLBED THROUGH THE ASSIGNED ALT. THE MODE C INDICATED 400 FT HIGH. I ALERTED THE PLT AND HE DSNDED. I DON'T KNOW WHY THIS HAPPENED.
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.