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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Flight crew of an air carrier mdt turboprop overshot assigned altitude during descent resulting in ATC intervention and their immediate return to assigned. The flight crew believed that they were cleared to a lower altitude even though they were given an air traffic advisory of an aircraft at that altitude.
| Attributes | |
| ACN | 404899 |
| Time | |
| Date | 199806 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : pvd |
| State Reference | RI |
| Altitude | msl bound lower : 11500 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | enroute airway : v475 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 12000 flight time type : 3600 |
| ASRS Report | 404899 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 13000 flight time type : 6000 |
| ASRS Report | 404900 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Miss Distance | horizontal : 42000 vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Cleared for IFR descent from 13000 ft to 12000 ft. Traffic was pointed out at 9 O'clock, approximately 7 mi. Traffic was reported in sight. I believe that we were also cleared to 11000 ft. ZBW told us to stop our descent at 12000 ft. We told center we were at 11500 ft and immediately climbed to 12000 ft. I believe there was confusion about the actual clearance altitude and as to whether we were cleared to 12000 ft or 11000 ft. The traffic pointed out by center was very distant at 11000 ft and not really a conflict. Normal expectation on that route and destination is for a descent clearance to 11000 ft at that location.
Original NASA ASRS Text
Title: FLC OF AN ACR MDT TURBOPROP OVERSHOT ASSIGNED ALT DURING DSCNT RESULTING IN ATC INTERVENTION AND THEIR IMMEDIATE RETURN TO ASSIGNED. THE FLC BELIEVED THAT THEY WERE CLRED TO A LOWER ALT EVEN THOUGH THEY WERE GIVEN AN AIR TFC ADVISORY OF AN ACFT AT THAT ALT.
Narrative: CLRED FOR IFR DSCNT FROM 13000 FT TO 12000 FT. TFC WAS POINTED OUT AT 9 O'CLOCK, APPROX 7 MI. TFC WAS RPTED IN SIGHT. I BELIEVE THAT WE WERE ALSO CLRED TO 11000 FT. ZBW TOLD US TO STOP OUR DSCNT AT 12000 FT. WE TOLD CTR WE WERE AT 11500 FT AND IMMEDIATELY CLBED TO 12000 FT. I BELIEVE THERE WAS CONFUSION ABOUT THE ACTUAL CLRNC ALT AND AS TO WHETHER WE WERE CLRED TO 12000 FT OR 11000 FT. THE TFC POINTED OUT BY CTR WAS VERY DISTANT AT 11000 FT AND NOT REALLY A CONFLICT. NORMAL EXPECTATION ON THAT RTE AND DEST IS FOR A DSCNT CLRNC TO 11000 FT AT THAT LOCATION.
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.