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When an A310 flight crew was asked to verify their altitude, they learned that the controller had thought that they were cleared to FL240.
| Attributes | |
| ACN | 337301 |
| Time | |
| Date | 199605 |
| Day | Wed |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : eno |
| State Reference | DE |
| Altitude | msl bound lower : 23000 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | A310 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star enroute airway : zdc |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : private pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 10000 flight time type : 300 |
| ASRS Report | 337301 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 180 flight time total : 18000 flight time type : 600 |
| ASRS Report | 337300 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Misunderstanding in altitude cleared to after leveling at FL230. After several clrncs to lower altitudes in our descent we leveled at FL230. Controller (ZDC) asked us to verify our altitude. I replied 'FL230' with no reply from the controller, I asked if we were supposed to be somewhere else to which he replied 'I thought I cleared you to FL240 but you're ok there.' obviously there was a misunderstanding but we do not know on whose part.
Original NASA ASRS Text
Title: WHEN AN A310 FLC WAS ASKED TO VERIFY THEIR ALT, THEY LEARNED THAT THE CTLR HAD THOUGHT THAT THEY WERE CLRED TO FL240.
Narrative: MISUNDERSTANDING IN ALT CLRED TO AFTER LEVELING AT FL230. AFTER SEVERAL CLRNCS TO LOWER ALTS IN OUR DSCNT WE LEVELED AT FL230. CTLR (ZDC) ASKED US TO VERIFY OUR ALT. I REPLIED 'FL230' WITH NO REPLY FROM THE CTLR, I ASKED IF WE WERE SUPPOSED TO BE SOMEWHERE ELSE TO WHICH HE REPLIED 'I THOUGHT I CLRED YOU TO FL240 BUT YOU'RE OK THERE.' OBVIOUSLY THERE WAS A MISUNDERSTANDING BUT WE DO NOT KNOW ON WHOSE PART.
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.