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B777-200 crew has a master warning light illuminate, and a master warning aural alert sound at 120 KTS on takeoff roll.
| Attributes | |
| ACN | 609499 |
| Time | |
| Date | 200402 |
| Day | Fri |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Controlling Facilities | tower : zzz.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : takeoff roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 609499 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | controller : provided flight assist flight crew : declared emergency flight crew : landed in emergency condition |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Use of emergency authority/authorized. Accelerating through approximately 120 KTS, master warning light accompanied by master warning aural alert and confign gear steering message occurred. Announced 'continue' and increased thrust to near maximum. First officer smoothly lifted off, at which point the warning message was replaced with an EICAS main gear steering message. Subsequent investigation revealed both main landing gear steering system had failed, the left main landing gear steering unit remained unlocked and turned slightly to right. As the outcome of touchdown with an unctred landing gear was unknown, I elected to prepare for an emergency landing. Flight attendants were advised and flight continued normally to destination. Landing was uneventful. Aircraft, passenger and crew unhurt.
Original NASA ASRS Text
Title: B777-200 CREW HAS A MASTER WARNING LIGHT ILLUMINATE, AND A MASTER WARNING AURAL ALERT SOUND AT 120 KTS ON TKOF ROLL.
Narrative: USE OF EMER AUTH. ACCELERATING THROUGH APPROX 120 KTS, MASTER WARNING LIGHT ACCOMPANIED BY MASTER WARNING AURAL ALERT AND CONFIGN GEAR STEERING MESSAGE OCCURRED. ANNOUNCED 'CONTINUE' AND INCREASED THRUST TO NEAR MAX. FO SMOOTHLY LIFTED OFF, AT WHICH POINT THE WARNING MESSAGE WAS REPLACED WITH AN EICAS MAIN GEAR STEERING MESSAGE. SUBSEQUENT INVESTIGATION REVEALED BOTH MAIN LNDG GEAR STEERING SYS HAD FAILED, THE L MAIN LNDG GEAR STEERING UNIT REMAINED UNLOCKED AND TURNED SLIGHTLY TO R. AS THE OUTCOME OF TOUCHDOWN WITH AN UNCTRED LNDG GEAR WAS UNKNOWN, I ELECTED TO PREPARE FOR AN EMER LNDG. FLT ATTENDANTS WERE ADVISED AND FLT CONTINUED NORMALLY TO DEST. LNDG WAS UNEVENTFUL. ACFT, PAX AND CREW UNHURT.
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.