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An ARTCC controller advised a cpr C560 that their mode C showed them 200 ft too high while they were in cruise at FL410.
| Attributes | |
| ACN | 428440 |
| Time | |
| Date | 199902 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : sfo.vor |
| State Reference | CA |
| Altitude | msl single value : 41000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Citation V |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zoa.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Citation V |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 60 flight time total : 12000 flight time type : 1050 |
| ASRS Report | 428440 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued advisory none taken : anomaly accepted |
| Consequence | other |
| Supplementary | |
| Problem Areas | Environmental Factor |
| Primary Problem | Ambiguous |
Narrative:
Cleared to FL410. ZOA reported they showed us 200 ft high. We were in fact level at FL410. We relayed this to them. Callback conversation with reporter revealed the following information: the reporter said that his maintenance organization checked the aircraft's altimeters and the mode C of the transponder and no malfunctions were found. He did not change his altitude after the controller's advisory because both altimeters indicated FL410. The captain said that no further advisories of this nature were given.
Original NASA ASRS Text
Title: AN ARTCC CTLR ADVISED A CPR C560 THAT THEIR MODE C SHOWED THEM 200 FT TOO HIGH WHILE THEY WERE IN CRUISE AT FL410.
Narrative: CLRED TO FL410. ZOA RPTED THEY SHOWED US 200 FT HIGH. WE WERE IN FACT LEVEL AT FL410. WE RELAYED THIS TO THEM. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAID THAT HIS MAINT ORGANIZATION CHKED THE ACFT'S ALTIMETERS AND THE MODE C OF THE XPONDER AND NO MALFUNCTIONS WERE FOUND. HE DID NOT CHANGE HIS ALT AFTER THE CTLR'S ADVISORY BECAUSE BOTH ALTIMETERS INDICATED FL410. THE CAPT SAID THAT NO FURTHER ADVISORIES OF THIS NATURE WERE GIVEN.
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.