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Flight crew was transmitting on their altitude encoder they were 300 ft lower than their assigned altitude and their indicated altitude.
| Attributes | |
| ACN | 314439 |
| Time | |
| Date | 199508 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : pit |
| State Reference | PA |
| Altitude | msl bound lower : 5700 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : pit |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 19000 flight time type : 5000 |
| ASRS Report | 314439 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 100 flight time total : 6000 |
| ASRS Report | 314440 |
| 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 | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Pit approach noted that their display indicated our aircraft to be 300 ft low (5700 ft MSL), and pointed out traffic at 5000 ft. Our indications (altimeters -- all set to local corrected barometric) were that the aircraft was in fact maintaining 6000 ft MSL. The altitude encoder was transferred to the #2 unit and ATC advised their equipment then indicated us to be maintaining 6000 ft. Discrepancy noted in aircraft maintenance log.
Original NASA ASRS Text
Title: FLC WAS XMITTING ON THEIR ALT ENCODER THEY WERE 300 FT LOWER THAN THEIR ASSIGNED ALT AND THEIR INDICATED ALT.
Narrative: PIT APCH NOTED THAT THEIR DISPLAY INDICATED OUR ACFT TO BE 300 FT LOW (5700 FT MSL), AND POINTED OUT TFC AT 5000 FT. OUR INDICATIONS (ALTIMETERS -- ALL SET TO LCL CORRECTED BAROMETRIC) WERE THAT THE ACFT WAS IN FACT MAINTAINING 6000 FT MSL. THE ALT ENCODER WAS TRANSFERRED TO THE #2 UNIT AND ATC ADVISED THEIR EQUIP THEN INDICATED US TO BE MAINTAINING 6000 FT. DISCREPANCY NOTED IN ACFT MAINT LOG.
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.