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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Flight crew prematurely set altimeter to qnh but subsequent ATC clearance to level at FL180 where altimeter should have been set to qne resulted in level off 220 ft low.
| Attributes | |
| ACN | 321310 |
| Time | |
| Date | 199511 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : tys |
| State Reference | TN |
| Altitude | msl bound lower : 17780 msl bound upper : 18000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | enroute other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 15000 flight time type : 2000 |
| ASRS Report | 321310 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On descent from cruise we were given a crossing restr of 30 north of tys at 11000 ft. On descent ATC advised to level at FL180. Aircraft altimeter had already been reset to local altimeter setting of 30.10, but vnaf captured late and descended to altitude of 17780 ft on altimeter of 30.10. No conflict by ATC noted or advised by ATC. Actual altitude on 29.92 would have been FL180 but air data from #1 altimeter may have sent the 17780 ft.
Original NASA ASRS Text
Title: FLC PREMATURELY SET ALTIMETER TO QNH BUT SUBSEQUENT ATC CLRNC TO LEVEL AT FL180 WHERE ALTIMETER SHOULD HAVE BEEN SET TO QNE RESULTED IN LEVEL OFF 220 FT LOW.
Narrative: ON DSCNT FROM CRUISE WE WERE GIVEN A XING RESTR OF 30 N OF TYS AT 11000 FT. ON DSCNT ATC ADVISED TO LEVEL AT FL180. ACFT ALTIMETER HAD ALREADY BEEN RESET TO LCL ALTIMETER SETTING OF 30.10, BUT VNAF CAPTURED LATE AND DSNDED TO ALT OF 17780 FT ON ALTIMETER OF 30.10. NO CONFLICT BY ATC NOTED OR ADVISED BY ATC. ACTUAL ALT ON 29.92 WOULD HAVE BEEN FL180 BUT AIR DATA FROM #1 ALTIMETER MAY HAVE SENT THE 17780 FT.
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.