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A B747-400 departing rjaa experienced a dual FMC failure on departure. The augmented flight crew was able to restore FMC operation and continue to destination.
| Attributes | |
| ACN | 433550 |
| Time | |
| Date | 199904 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| State Reference | FO |
| Altitude | msl single value : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : rjaa.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : cvc 8 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 13000 flight time type : 100 |
| ASRS Report | 433550 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : multi engine |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other flight crewa other flight crewb other other : 3 |
| Resolutory Action | aircraft : equipment problem dissipated |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
While climbing out of rjaa on the choshi 8 departure from runway 34, we experienced a dual FMC failure with both navigation displays going blank. I was the captain and flying on autoplt while in the right seat was a copilot on her first trip after IOE. We were double crewed and the other 2 pilots were in the jump seats. The autoplt was left of the sne 100 degree radial and correcting when the event occurred. I instructed the first officer to advise ATC we had lost navigation and request a vector to cvc. (A point further along the departure.) she was overwhelmed by the event and it took repeating these instructions several times before being completed. The help of the experienced pilots in the jump seats was invaluable in restoring the FMC's and continuing on after establishing normal operation of the previously 'timed out' FMC's. 'Fly the airplane' first philosophy was good training to fall back on as was the policy of having all 4 pilots in the cockpit for takeoff and landing.
Original NASA ASRS Text
Title: A B747-400 DEPARTING RJAA EXPERIENCED A DUAL FMC FAILURE ON DEP. THE AUGMENTED FLC WAS ABLE TO RESTORE FMC OP AND CONTINUE TO DEST.
Narrative: WHILE CLBING OUT OF RJAA ON THE CHOSHI 8 DEP FROM RWY 34, WE EXPERIENCED A DUAL FMC FAILURE WITH BOTH NAV DISPLAYS GOING BLANK. I WAS THE CAPT AND FLYING ON AUTOPLT WHILE IN THE R SEAT WAS A COPLT ON HER FIRST TRIP AFTER IOE. WE WERE DOUBLE CREWED AND THE OTHER 2 PLTS WERE IN THE JUMP SEATS. THE AUTOPLT WAS L OF THE SNE 100 DEG RADIAL AND CORRECTING WHEN THE EVENT OCCURRED. I INSTRUCTED THE FO TO ADVISE ATC WE HAD LOST NAV AND REQUEST A VECTOR TO CVC. (A POINT FURTHER ALONG THE DEP.) SHE WAS OVERWHELMED BY THE EVENT AND IT TOOK REPEATING THESE INSTRUCTIONS SEVERAL TIMES BEFORE BEING COMPLETED. THE HELP OF THE EXPERIENCED PLTS IN THE JUMP SEATS WAS INVALUABLE IN RESTORING THE FMC'S AND CONTINUING ON AFTER ESTABLISHING NORMAL OP OF THE PREVIOUSLY 'TIMED OUT' FMC'S. 'FLY THE AIRPLANE' FIRST PHILOSOPHY WAS GOOD TRAINING TO FALL BACK ON AS WAS THE POLICY OF HAVING ALL 4 PLTS IN THE COCKPIT FOR TKOF AND LNDG.
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.