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A DHC6-200 skydiving aircraft's transponder mode C readout reads 600 ft too high while in proximity of class a airspace on frequency with D01, co.
| Attributes | |
| ACN | 473040 |
| Time | |
| Date | 200005 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : 2v2.airport |
| State Reference | CO |
| Altitude | msl bound lower : 17400 msl bound upper : 18000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : d01.tracon |
| Operator | general aviation : corporate |
| Make Model Name | Twin Otter DHC-6 |
| Operating Under FAR Part | Part 135 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Route In Use | enroute : direct |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : single pilot |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 100 flight time total : 2300 flight time type : 300 |
| ASRS Report | 473040 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : less severe maintenance problem : improper maintenance non adherence : far non adherence : published procedure other anomaly other |
| Independent Detector | atc equipment other atc equipment : radar other controllera |
| Resolutory Action | controller : issued advisory flight crew : overcame equipment problem |
| Consequence | faa : reviewed incident with flight crew other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft Company |
| Primary Problem | Aircraft |
Narrative:
Flying a newly leased DHC6-200 on jump run level at 17400 ft MSL. ATC said we were at FL180 (class a airspace). I verified altimeter setting and altitude and determined my altitude encoder was off 600 ft. I switched to the #2 transponder which was within 200-300 ft.
Original NASA ASRS Text
Title: A DHC6-200 SKYDIVING ACFT'S XPONDER MODE C READOUT READS 600 FT TOO HIGH WHILE IN PROX OF CLASS A AIRSPACE ON FREQ WITH D01, CO.
Narrative: FLYING A NEWLY LEASED DHC6-200 ON JUMP RUN LEVEL AT 17400 FT MSL. ATC SAID WE WERE AT FL180 (CLASS A AIRSPACE). I VERIFIED ALTIMETER SETTING AND ALT AND DETERMINED MY ALT ENCODER WAS OFF 600 FT. I SWITCHED TO THE #2 XPONDER WHICH WAS WITHIN 200-300 FT.
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.