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Transponder and altitude encoding were intermittent and encoder erroneously indicated 800 ft high while BA32 flight crew was at assigned altitude and in level flight.
| Attributes | |
| ACN | 312360 |
| Time | |
| Date | 199508 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : swf |
| State Reference | NY |
| Altitude | msl bound lower : 10000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90 |
| Operator | common carrier : air carrier |
| Make Model Name | Jetstream 32 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | climbout : intermediate altitude cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : cfi |
| Experience | flight time last 90 days : 240 flight time total : 4500 flight time type : 1600 |
| ASRS Report | 312360 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 9000 flight time type : 150 |
| ASRS Report | 312369 |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Departing swf on radar vectors to weard intersection, we leveled off at 10000 ft as assigned. New york approach controller asked us what altitude we had been given. We said 10000 ft, and he said we were at 10800 ft. Both of our altimeters read 10000 ft. Our #1 altitude encoder and transponder was intermittent throughout the flight. We switched to #2 and ATC had a good transponder/encoder signal. When we arrived at destination, maintenance was advised of event.
Original NASA ASRS Text
Title: XPONDER AND ALT ENCODING WERE INTERMITTENT AND ENCODER ERRONEOUSLY INDICATED 800 FT HIGH WHILE BA32 FLC WAS AT ASSIGNED ALT AND IN LEVEL FLT.
Narrative: DEPARTING SWF ON RADAR VECTORS TO WEARD INTXN, WE LEVELED OFF AT 10000 FT AS ASSIGNED. NEW YORK APCH CTLR ASKED US WHAT ALT WE HAD BEEN GIVEN. WE SAID 10000 FT, AND HE SAID WE WERE AT 10800 FT. BOTH OF OUR ALTIMETERS READ 10000 FT. OUR #1 ALT ENCODER AND XPONDER WAS INTERMITTENT THROUGHOUT THE FLT. WE SWITCHED TO #2 AND ATC HAD A GOOD XPONDER/ENCODER SIGNAL. WHEN WE ARRIVED AT DEST, MAINT WAS ADVISED OF EVENT.
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.