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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An first officer read back the correct altitude, but misset the altitude select, causing the part 135 cargo jet to descend 1000 ft below assigned altitude to the altitude selected. Altitude deviation altitude overshot led to a potential conflict.
| Attributes | |
| ACN | 328941 |
| Time | |
| Date | 199602 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : agc |
| State Reference | PA |
| Altitude | msl bound lower : 11000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air taxi |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 135 |
| Flight Phase | descent other |
| Route In Use | enroute airway : zob |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 300 flight time total : 2600 flight time type : 1720 |
| ASRS Report | 328941 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 300 flight time total : 10500 flight time type : 2300 |
| ASRS Report | 328353 |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : clearance |
| Independent Detector | other other : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 24000 vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
I was descending and cleared to 12000 ft. Read back 12000 ft and put 11000 ft in the altitude box. I did not realize my mistake and went down to 11000 ft. One contributing factor was that it was an unfamiliar airport which we had never been to. The PNF was looking at the approach book so I was flying and working the radio. To prevent a recurrence of this, the PNF could have looked at the approach book earlier. Also I could have confirmed the altitude with the PNF or the center.
Original NASA ASRS Text
Title: AN FO READ BACK THE CORRECT ALT, BUT MISSET THE ALT SELECT, CAUSING THE PART 135 CARGO JET TO DSND 1000 FT BELOW ASSIGNED ALT TO THE ALT SELECTED. ALTDEV ALT OVERSHOT LED TO A POTENTIAL CONFLICT.
Narrative: I WAS DSNDING AND CLRED TO 12000 FT. READ BACK 12000 FT AND PUT 11000 FT IN THE ALT BOX. I DID NOT REALIZE MY MISTAKE AND WENT DOWN TO 11000 FT. ONE CONTRIBUTING FACTOR WAS THAT IT WAS AN UNFAMILIAR ARPT WHICH WE HAD NEVER BEEN TO. THE PNF WAS LOOKING AT THE APCH BOOK SO I WAS FLYING AND WORKING THE RADIO. TO PREVENT A RECURRENCE OF THIS, THE PNF COULD HAVE LOOKED AT THE APCH BOOK EARLIER. ALSO I COULD HAVE CONFIRMED THE ALT WITH THE PNF OR THE CTR.
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.