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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An air carrier medium large transport flight crew descends below their assigned altitude while distraction by FMC entries.
| Attributes | |
| ACN | 342890 |
| Time | |
| Date | 199608 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : fim airport : lax |
| State Reference | CA |
| Altitude | msl bound lower : 9700 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : instrument pilot : flight engineer pilot : commercial |
| Experience | flight time last 90 days : 250 flight time total : 10000 flight time type : 1800 |
| ASRS Report | 342890 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 10000 flight time type : 1200 |
| ASRS Report | 342989 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence : far |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
After passing simon intersection we were cleared to 10000 ft from 12000 ft. At 10400 ft the controller issued a clearance 'direct santa monica.' the first officer entered the new route into the control display unit and asked for verification from the captain. I think that that was the time we were passing through 10000 ft. At 9700 ft the altitude alert horn sounded and we returned immediately to 10000 ft. There were no other aircraft in the area.
Original NASA ASRS Text
Title: AN ACR MLG FLC DSNDS BELOW THEIR ASSIGNED ALT WHILE DISTR BY FMC ENTRIES.
Narrative: AFTER PASSING SIMON INTXN WE WERE CLRED TO 10000 FT FROM 12000 FT. AT 10400 FT THE CTLR ISSUED A CLRNC 'DIRECT SANTA MONICA.' THE FO ENTERED THE NEW RTE INTO THE CTL DISPLAY UNIT AND ASKED FOR VERIFICATION FROM THE CAPT. I THINK THAT THAT WAS THE TIME WE WERE PASSING THROUGH 10000 FT. AT 9700 FT THE ALT ALERT HORN SOUNDED AND WE RETURNED IMMEDIATELY TO 10000 FT. THERE WERE NO OTHER ACFT IN THE AREA.
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.