 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Clearance misinterp results in excursion from assigned altitude. Assigning ARTCC radar controller did not hear readback. Alert controller in next sector picked up mistake in altitude.
| Attributes | |
| ACN | 131531 |
| Time | |
| Date | 198912 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : lrp |
| State Reference | PA |
| Altitude | msl bound lower : 24000 msl bound upper : 25000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 10000 flight time type : 5000 |
| ASRS Report | 131531 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi |
| Experience | flight time last 90 days : 150 flight time total : 9100 flight time type : 800 |
| ASRS Report | 131016 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Ambiguous |
| Air Traffic Incident | Operational Deviation Pilot Deviation other |
Narrative:
We were descending for landing into phl and were cleared to descend from cruise altitude to FL240. My copilot read back FL240 and I set it into the altitude alert at the same time. When we changed over to another sector on the next frequency. The new controller asked what altitude we were at. When we told him, he stated that the last controller 5 had cleared us to FL250, but it was ok. I believe we were at the altitude we were cleared to and either there was a mix-up between the 2 sectors, or the controller cleared us to the wrong altitude and did not hear or listen to our readback--probably the latter.
Original NASA ASRS Text
Title: CLRNC MISINTERP RESULTS IN EXCURSION FROM ASSIGNED ALT. ASSIGNING ARTCC RADAR CTLR DID NOT HEAR READBACK. ALERT CTLR IN NEXT SECTOR PICKED UP MISTAKE IN ALT.
Narrative: WE WERE DSNDING FOR LNDG INTO PHL AND WERE CLRED TO DSND FROM CRUISE ALT TO FL240. MY COPLT READ BACK FL240 AND I SET IT INTO THE ALT ALERT AT THE SAME TIME. WHEN WE CHANGED OVER TO ANOTHER SECTOR ON THE NEXT FREQ. THE NEW CTLR ASKED WHAT ALT WE WERE AT. WHEN WE TOLD HIM, HE STATED THAT THE LAST CTLR 5 HAD CLRED US TO FL250, BUT IT WAS OK. I BELIEVE WE WERE AT THE ALT WE WERE CLRED TO AND EITHER THERE WAS A MIX-UP BTWN THE 2 SECTORS, OR THE CTLR CLRED US TO THE WRONG ALT AND DID NOT HEAR OR LISTEN TO OUR READBACK--PROBABLY THE LATTER.
Data retrieved from NASA's ASRS site as of August 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.