 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Light transport aircraft in descent was advised by center controller that their altitude readout was 200 ft low. Altimeter was misset, but also reporter captain says the aircraft mode C was in error.
| Attributes | |
| ACN | 380610 |
| Time | |
| Date | 199709 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : roa |
| State Reference | VA |
| Altitude | msl bound lower : 12800 msl bound upper : 13000 |
| Aircraft 1 | |
| Operator | common carrier : air taxi |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 135 |
| Flight Phase | descent other |
| Route In Use | enroute airway : zdc |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 70 flight time total : 9000 flight time type : 300 |
| ASRS Report | 380610 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Descending from ZDC airspace to roa airspace, watching for crossing traffic. Dash 8 had passed under us and was well clear to our right. Center advised we showed 200 ft low. Altimeter read 60 ft low which I reported, altimeter setting change added 10 ft. We were waiting for altitude capture to take effect and it did not engage at 13000 ft, our assigned leveloff. We corrected manually but overshot 60 ft. Neither pilot totally familiar with this autoplt system and were experimenting with it. Center's call of 100 ft more than we indicate off is the second occasion where mode C not agree with altimeter. Plan to check with several ctrs as to mode C readout and if it is off, plan to have it adjusted.
Original NASA ASRS Text
Title: LTT ACFT IN DSCNT WAS ADVISED BY CTR CTLR THAT THEIR ALT READOUT WAS 200 FT LOW. ALTIMETER WAS MISSET, BUT ALSO RPTR CAPT SAYS THE ACFT MODE C WAS IN ERROR.
Narrative: DSNDING FROM ZDC AIRSPACE TO ROA AIRSPACE, WATCHING FOR XING TFC. DASH 8 HAD PASSED UNDER US AND WAS WELL CLR TO OUR R. CTR ADVISED WE SHOWED 200 FT LOW. ALTIMETER READ 60 FT LOW WHICH I RPTED, ALTIMETER SETTING CHANGE ADDED 10 FT. WE WERE WAITING FOR ALT CAPTURE TO TAKE EFFECT AND IT DID NOT ENGAGE AT 13000 FT, OUR ASSIGNED LEVELOFF. WE CORRECTED MANUALLY BUT OVERSHOT 60 FT. NEITHER PLT TOTALLY FAMILIAR WITH THIS AUTOPLT SYS AND WERE EXPERIMENTING WITH IT. CTR'S CALL OF 100 FT MORE THAN WE INDICATE OFF IS THE SECOND OCCASION WHERE MODE C NOT AGREE WITH ALTIMETER. PLAN TO CHK WITH SEVERAL CTRS AS TO MODE C READOUT AND IF IT IS OFF, PLAN TO HAVE IT ADJUSTED.
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.