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A BE36 CFI finds difficulty in assessing the accuracy of his mode C transponder when checking in with sea approach controller.
| Attributes | |
| ACN | 437470 |
| Time | |
| Date | 199905 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : bfi.airport |
| State Reference | WA |
| Altitude | agl single value : 1100 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : s46.tracon |
| Operator | general aviation : personal |
| Make Model Name | Bonanza 36 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other vortac |
| Flight Phase | climbout : initial climbout : takeoff |
| Route In Use | departure : vfr |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Qualification | pilot : cfi pilot : multi engine pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 100 flight time total : 1600 flight time type : 60 |
| ASRS Report | 437470 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : less severe airspace violation : entry altitude deviation : overshoot non adherence : far |
| Independent Detector | atc equipment other atc equipment : radar, mode c other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
After departing boeing field to the north, we decided to call sea departure for flight following. After our initial call and identing on the transponder, we were notified that we were in sea airspace. We were approximately 10 mi to the northwest at 1100 ft, below sea airspace. No further action was taken by sea. However, during the course of the flight I wanted to confirm that our altimeter setting and altitude did check with sea's. 2 out of the 3 times it did not. They were off by 400 ft. At the end of the flight, and 2 controllers later everything concurred.
Original NASA ASRS Text
Title: A BE36 CFI FINDS DIFFICULTY IN ASSESSING THE ACCURACY OF HIS MODE C XPONDER WHEN CHKING IN WITH SEA APCH CTLR.
Narrative: AFTER DEPARTING BOEING FIELD TO THE N, WE DECIDED TO CALL SEA DEP FOR FLT FOLLOWING. AFTER OUR INITIAL CALL AND IDENTING ON THE XPONDER, WE WERE NOTIFIED THAT WE WERE IN SEA AIRSPACE. WE WERE APPROX 10 MI TO THE NW AT 1100 FT, BELOW SEA AIRSPACE. NO FURTHER ACTION WAS TAKEN BY SEA. HOWEVER, DURING THE COURSE OF THE FLT I WANTED TO CONFIRM THAT OUR ALTIMETER SETTING AND ALT DID CHK WITH SEA'S. 2 OUT OF THE 3 TIMES IT DID NOT. THEY WERE OFF BY 400 FT. AT THE END OF THE FLT, AND 2 CTLRS LATER EVERYTHING CONCURRED.
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.