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The pilot of a C560 reports having anticipated a clearance to the altitude filed and having thought that he heard the controller issue a clearance for the same altitude. At 6000 ft above the pilot's assigned altitude, the controller queried his altitude and issued a new clearance.
| Attributes | |
| ACN | 340690 |
| Time | |
| Date | 199607 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : fra |
| State Reference | CA |
| Altitude | msl bound lower : 27000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa |
| Operator | general aviation : corporate |
| Make Model Name | Citation V |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : atp pilot : instrument pilot : cfi |
| Experience | flight time last 90 days : 116 flight time total : 24100 flight time type : 1840 |
| ASRS Report | 340690 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| 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:
I had filed for FL370. During the departure I had been cleared to and was maintaining FL230 when I received and read back a clearance to climb to and maintain FL370. As I was passing FL280, the controller asked what my altitude was. I replied, 'passing FL280 for FL370.' I was told to level at FL330 and that I had only been cleared to FL270. I acknowledged FL330 and advised the controller that I had received and read back the original clearance as FL370. No other comments on the subject were made by me or the controller. My passenger, sitting in the right seat, confirmed that he had heard the controller state the original clearance as FL370. There are times when the clearance is misunderstood or given in error by the controller and the readback is the only way to catch this mistake. If the controller misses the readback error, a real problem can occur.
Original NASA ASRS Text
Title: THE PLT OF A C560 RPTS HAVING ANTICIPATED A CLRNC TO THE ALT FILED AND HAVING THOUGHT THAT HE HEARD THE CTLR ISSUE A CLRNC FOR THE SAME ALT. AT 6000 FT ABOVE THE PLT'S ASSIGNED ALT, THE CTLR QUERIED HIS ALT AND ISSUED A NEW CLRNC.
Narrative: I HAD FILED FOR FL370. DURING THE DEP I HAD BEEN CLRED TO AND WAS MAINTAINING FL230 WHEN I RECEIVED AND READ BACK A CLRNC TO CLB TO AND MAINTAIN FL370. AS I WAS PASSING FL280, THE CTLR ASKED WHAT MY ALT WAS. I REPLIED, 'PASSING FL280 FOR FL370.' I WAS TOLD TO LEVEL AT FL330 AND THAT I HAD ONLY BEEN CLRED TO FL270. I ACKNOWLEDGED FL330 AND ADVISED THE CTLR THAT I HAD RECEIVED AND READ BACK THE ORIGINAL CLRNC AS FL370. NO OTHER COMMENTS ON THE SUBJECT WERE MADE BY ME OR THE CTLR. MY PAX, SITTING IN THE R SEAT, CONFIRMED THAT HE HAD HEARD THE CTLR STATE THE ORIGINAL CLRNC AS FL370. THERE ARE TIMES WHEN THE CLRNC IS MISUNDERSTOOD OR GIVEN IN ERROR BY THE CTLR AND THE READBACK IS THE ONLY WAY TO CATCH THIS MISTAKE. IF THE CTLR MISSES THE READBACK ERROR, A REAL PROB CAN OCCUR.
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.