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An air carrier flight crew flying a BAE3100 from jfk reports discrepancy between their aircraft's actual altitude and the altitude perceived by ATC.
| Attributes | |
| ACN | 454954 |
| Time | |
| Date | 199911 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : jfk.airport |
| State Reference | NY |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Jetstream 31 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | climbout : initial climbout : intermediate altitude |
| Route In Use | departure sid : kennedy 7 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : multi engine |
| Experience | flight time last 90 days : 180 flight time total : 5000 flight time type : 1200 |
| ASRS Report | 454954 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : multi engine |
| Experience | controller non radar : 3 controller radar : 4 controller supervisory : 2 flight time last 90 days : 199 flight time total : 4200 flight time type : 1825 |
| ASRS Report | 454950 |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other controllera other flight crewa other flight crewb |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | ATC Facility ATC Human Performance |
| Primary Problem | Ambiguous |
Narrative:
On idle wilde climb, kennedy 7 departure, cleared to 3000 ft and handed off to departure. On 135.9 heard ATC advise VFR aircraft we were through his altitude. Checked on at 3000 ft, ATC queried altitude. Next controller reported us through 8000 ft as we were climbing through 7000 ft. Controller after that reported our mode C intermittent. Switched to #2 transponder, no further problems.
Original NASA ASRS Text
Title: AN ACR FLC FLYING A BAE3100 FROM JFK RPTS DISCREPANCY BTWN THEIR ACFT'S ACTUAL ALT AND THE ALT PERCEIVED BY ATC.
Narrative: ON IDLE WILDE CLB, KENNEDY 7 DEP, CLRED TO 3000 FT AND HANDED OFF TO DEP. ON 135.9 HEARD ATC ADVISE VFR ACFT WE WERE THROUGH HIS ALT. CHKED ON AT 3000 FT, ATC QUERIED ALT. NEXT CTLR RPTED US THROUGH 8000 FT AS WE WERE CLBING THROUGH 7000 FT. CTLR AFTER THAT RPTED OUR MODE C INTERMITTENT. SWITCHED TO #2 XPONDER, NO FURTHER PROBS.
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.