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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An ARTCC radar controller tells an air carrier flight crew that they indicate 400 ft low on their mode C readout. They reset the transponder mode and reset the altimeters and the problem corrects itself.
| Attributes | |
| ACN | 330040 |
| Time | |
| Date | 199603 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : map |
| State Reference | MO |
| Altitude | msl bound lower : 30600 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc artcc : zoa |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 30 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 5000 flight time type : 1000 |
| ASRS Report | 330040 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
While in cruise flight at 31000 ft, ATC asked us to state our current altitude. We state '31000 ft level.' ATC claimed we are showed to be 400 ft low. It was not clear of the cause in the altitude difference indicated by ATC. The transponder/altitude mode was reset, and altimeters reset to 29.92 setting. This seemed to fix the error, ATC seemed ok with the resolved problem. No further problems noted.
Original NASA ASRS Text
Title: AN ARTCC RADAR CTLR TELLS AN ACR FLC THAT THEY INDICATE 400 FT LOW ON THEIR MODE C READOUT. THEY RESET THE XPONDER MODE AND RESET THE ALTIMETERS AND THE PROB CORRECTS ITSELF.
Narrative: WHILE IN CRUISE FLT AT 31000 FT, ATC ASKED US TO STATE OUR CURRENT ALT. WE STATE '31000 FT LEVEL.' ATC CLAIMED WE ARE SHOWED TO BE 400 FT LOW. IT WAS NOT CLR OF THE CAUSE IN THE ALT DIFFERENCE INDICATED BY ATC. THE XPONDER/ALT MODE WAS RESET, AND ALTIMETERS RESET TO 29.92 SETTING. THIS SEEMED TO FIX THE ERROR, ATC SEEMED OK WITH THE RESOLVED PROB. NO FURTHER PROBS NOTED.
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.