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Temporary loss of aircraft control during a 20 degree roll when both FMS units on a B737 fail during a departure from gum, gu.
| Attributes | |
| ACN | 622216 |
| Time | |
| Date | 200402 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : gum.airport |
| State Reference | GU |
| Altitude | msl single value : 3000 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : pacific |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 2500 flight time total : 10000 flight time type : 200 |
| ASRS Report | 622216 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : regained aircraft control flight crew : returned to original clearance flight crew : overrode automation |
| Consequence | Other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Aircraft had single FMC failure on first officer's side, followed by failure of captain's FMC. With second failure, aircraft rolled abruptly to the l-hand side, approximately 20 degrees. Captain (PF) disconnected autoplt and regained aircraft control promptly. Accomplished QRH procedure for dual FMC failure. Approximately 3 mins later, both FMC's reset. So noted in maintenance logbook at station. Noticed in several other logbooks other FMC failures. Specifically the next day on aircraft for the final leg of trip next day, concerned about future FMC failures in non glass aircraft.
Original NASA ASRS Text
Title: TEMPORARY LOSS OF ACFT CTL DURING A 20 DEG ROLL WHEN BOTH FMS UNITS ON A B737 FAIL DURING A DEP FROM GUM, GU.
Narrative: ACFT HAD SINGLE FMC FAILURE ON FO'S SIDE, FOLLOWED BY FAILURE OF CAPT'S FMC. WITH SECOND FAILURE, ACFT ROLLED ABRUPTLY TO THE L-HAND SIDE, APPROX 20 DEGS. CAPT (PF) DISCONNECTED AUTOPLT AND REGAINED ACFT CTL PROMPTLY. ACCOMPLISHED QRH PROC FOR DUAL FMC FAILURE. APPROX 3 MINS LATER, BOTH FMC'S RESET. SO NOTED IN MAINT LOGBOOK AT STATION. NOTICED IN SEVERAL OTHER LOGBOOKS OTHER FMC FAILURES. SPECIFICALLY THE NEXT DAY ON ACFT FOR THE FINAL LEG OF TRIP NEXT DAY, CONCERNED ABOUT FUTURE FMC FAILURES IN NON GLASS ACFT.
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.