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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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A cpr pilot's mode C reads 500 ft high according to an ARTCC radar controller. The pilot switched to the #2 transponder which gave a correct reading.
| Attributes | |
| ACN | 323110 |
| Time | |
| Date | 199512 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : dyr |
| State Reference | TN |
| Altitude | msl bound lower : 16000 msl bound upper : 16000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme tower : bdl |
| Operator | general aviation : corporate |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Route In Use | enroute airway : zme |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : commercial pilot : cfi |
| Experience | flight time last 90 days : 100 flight time total : 10000 flight time type : 1500 |
| ASRS Report | 323110 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Center asked altitude. I reported 16000 ft. Center responded with a 500 ft discrepancy at 16500 ft. Given a barometric setting of 30.55. Switched xponders to #2 system. Center reported 'in compliance.' no explanation of why system #1 reported 500 ft out. Cannot duplicate occurrence on system.
Original NASA ASRS Text
Title: A CPR PLT'S MODE C READS 500 FT HIGH ACCORDING TO AN ARTCC RADAR CTLR. THE PLT SWITCHED TO THE #2 XPONDER WHICH GAVE A CORRECT READING.
Narrative: CTR ASKED ALT. I RPTED 16000 FT. CTR RESPONDED WITH A 500 FT DISCREPANCY AT 16500 FT. GIVEN A BAROMETRIC SETTING OF 30.55. SWITCHED XPONDERS TO #2 SYS. CTR RPTED 'IN COMPLIANCE.' NO EXPLANATION OF WHY SYS #1 RPTED 500 FT OUT. CANNOT DUPLICATE OCCURRENCE ON SYS.
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.