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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An air carrier flight crew descended below 28000 ft assigned due to an incorrect altimeter setting on the #1 digital flight guidance computer. The ARTCC radar controller caught the error at 27500 ft and reclred the air carrier to 28000 ft.
| Attributes | |
| ACN | 324920 |
| Time | |
| Date | 199601 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : emi |
| State Reference | MD |
| Altitude | msl bound lower : 27500 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial |
| Experience | flight time last 90 days : 120 flight time total : 6000 flight time type : 3500 |
| ASRS Report | 324920 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 16000 flight time type : 1200 |
| ASRS Report | 325094 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : far 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:
We climbed to an initial cruise altitude of 35000 ft. We experienced chop in the climb and requested descent to 28000 ft. During leveloff, ATC reported altitude readout of 27500 ft. #1 dfgc was not set to 29.92 and this resulted in an altitude deviation. Failure to set altimeter, due to distraction on climb out. Fatigue may also have been a factor because it was the last leg of a 4 day trip.
Original NASA ASRS Text
Title: AN ACR FLC DSNDED BELOW 28000 FT ASSIGNED DUE TO AN INCORRECT ALTIMETER SETTING ON THE #1 DIGITAL FLT GUIDANCE COMPUTER. THE ARTCC RADAR CTLR CAUGHT THE ERROR AT 27500 FT AND RECLRED THE ACR TO 28000 FT.
Narrative: WE CLBED TO AN INITIAL CRUISE ALT OF 35000 FT. WE EXPERIENCED CHOP IN THE CLB AND REQUESTED DSCNT TO 28000 FT. DURING LEVELOFF, ATC RPTED ALT READOUT OF 27500 FT. #1 DFGC WAS NOT SET TO 29.92 AND THIS RESULTED IN AN ALTDEV. FAILURE TO SET ALTIMETER, DUE TO DISTR ON CLBOUT. FATIGUE MAY ALSO HAVE BEEN A FACTOR BECAUSE IT WAS THE LAST LEG OF A 4 DAY TRIP.
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.