|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||0601 To 1200|
|Locale Reference||airport : teb|
|Altitude||msl bound lower : 1400|
msl bound upper : 2000
|Controlling Facilities||tracon : n90|
tower : teb
|Operator||general aviation : personal|
|Make Model Name||Small Aircraft, High Wing, 1 Eng, Fixed Gear|
|Function||flight crew : single pilot|
|Qualification||pilot : commercial|
pilot : instrument
|Experience||flight time last 90 days : 25|
flight time total : 405
flight time type : 11
|Affiliation||government : faa|
|Function||controller : local|
|Qualification||controller : non radar|
|Anomaly||non adherence : far|
other anomaly other
|Independent Detector||other controllera|
|Resolutory Action||none taken : unable|
|Air Traffic Incident||Pilot Deviation|
On a left downwind departure from runway 24 teb we were level at 1400 MSL. The tower was calling traffic to an arrival and reported us at 2000 (which would have put us into the TCA) and our altimeter was set correctly. We asked the tower to verify his mode C readout, and he said it was 2000 so we shut our mode C off (after telling the tower and again reporting level at 1400). Later we checked with approach and our mode C was equal to our indicated altitude. On our return we checked again with teb tower and the mode C readout was equal to the indicated altitude. The only explanation is that the tower was tracking another aircraft, but try to tell the FAA that if they're looking for a violation.
Original NASA ASRS Text
Title: SMA HAS MODE C READOUT DIFFERENT FROM INDICATED ALT WITH PROPER ALTIMETER SETTING.
Narrative: ON A L DOWNWIND DEP FROM RWY 24 TEB WE WERE LEVEL AT 1400 MSL. THE TWR WAS CALLING TFC TO AN ARR AND RPTED US AT 2000 (WHICH WOULD HAVE PUT US INTO THE TCA) AND OUR ALTIMETER WAS SET CORRECTLY. WE ASKED THE TWR TO VERIFY HIS MODE C READOUT, AND HE SAID IT WAS 2000 SO WE SHUT OUR MODE C OFF (AFTER TELLING THE TWR AND AGAIN RPTING LEVEL AT 1400). LATER WE CHKED WITH APCH AND OUR MODE C WAS EQUAL TO OUR INDICATED ALT. ON OUR RETURN WE CHKED AGAIN WITH TEB TWR AND THE MODE C READOUT WAS EQUAL TO THE INDICATED ALT. THE ONLY EXPLANATION IS THAT THE TWR WAS TRACKING ANOTHER ACFT, BUT TRY TO TELL THE FAA THAT IF THEY'RE LOOKING FOR A VIOLATION.
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.