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A C172 pilot, cruising at 6000 ft over bgr, believed the altitude displayed by his GPS was correct. It was incorrect by 300 ft.
| Attributes | |
| ACN | 532105 |
| Time | |
| Date | 200112 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : gbr.airport |
| State Reference | MA |
| Altitude | msl bound lower : 5700 msl bound upper : 6300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc tracon : bdl.tracon tower : ues.tower |
| Operator | general aviation : personal |
| Make Model Name | Skylane 182/RG Turbo Skylane/RG |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : single pilot |
| Qualification | pilot : private pilot : instrument |
| Experience | flight time last 90 days : 20 flight time total : 1100 flight time type : 1000 |
| ASRS Report | 532105 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure non adherence : far other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to assigned altitude |
| Consequence | faa : reviewed incident with flight crew other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
My GPS indicated an altitude of 5700 ft MSL. My altimeter indicated 6000 ft MSL. Believing my GPS, I corrected my altitude to have the GPS show 6000 ft, the altitude I was assigned by ATC. ATC informed me that my altitude was then 6300 ft. I corrected accordingly, and have contacted the manufacturers of the GPS for repair of the instrument.
Original NASA ASRS Text
Title: A C172 PLT, CRUISING AT 6000 FT OVER BGR, BELIEVED THE ALT DISPLAYED BY HIS GPS WAS CORRECT. IT WAS INCORRECT BY 300 FT.
Narrative: MY GPS INDICATED AN ALT OF 5700 FT MSL. MY ALTIMETER INDICATED 6000 FT MSL. BELIEVING MY GPS, I CORRECTED MY ALT TO HAVE THE GPS SHOW 6000 FT, THE ALT I WAS ASSIGNED BY ATC. ATC INFORMED ME THAT MY ALT WAS THEN 6300 FT. I CORRECTED ACCORDINGLY, AND HAVE CONTACTED THE MANUFACTURERS OF THE GPS FOR REPAIR OF THE INST.
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.