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Aircraft equipment problem. Air carrier transponder mode C read 500-700 ft high. Switched to another transponder.
| Attributes | |
| ACN | 302080 |
| Time | |
| Date | 199504 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : ewr |
| State Reference | NJ |
| Altitude | msl bound lower : 4000 msl bound upper : 4700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90 tower : msy |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | departure other departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 12000 flight time type : 5000 |
| ASRS Report | 302080 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 100 flight time total : 1700 |
| ASRS Report | 302084 |
| 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:
Ewr departure issued a climb from 4000 ft to 6000 ft, expedite through 5000 ft, we complied. We were then asked if we got the 4000 ft altitude assignment. We replied that we did and were level at 4000 ft until starting the requested climb. Apparently our altitude was being encoded as 4700 ft. We were switched to the next controller and asked him for an altitude report. He showed us 500 ft too high. We switched to the #2 encoder and reported and MEL logged the faulty encoder #1 at the next down line station, albany, ny.
Original NASA ASRS Text
Title: ACFT EQUIP PROB. ACR XPONDER MODE C READ 500-700 FT HIGH. SWITCHED TO ANOTHER XPONDER.
Narrative: EWR DEP ISSUED A CLB FROM 4000 FT TO 6000 FT, EXPEDITE THROUGH 5000 FT, WE COMPLIED. WE WERE THEN ASKED IF WE GOT THE 4000 FT ALT ASSIGNMENT. WE REPLIED THAT WE DID AND WERE LEVEL AT 4000 FT UNTIL STARTING THE REQUESTED CLB. APPARENTLY OUR ALT WAS BEING ENCODED AS 4700 FT. WE WERE SWITCHED TO THE NEXT CTLR AND ASKED HIM FOR AN ALT RPT. HE SHOWED US 500 FT TOO HIGH. WE SWITCHED TO THE #2 ENCODER AND RPTED AND MEL LOGGED THE FAULTY ENCODER #1 AT THE NEXT DOWN LINE STATION, ALBANY, NY.
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.