A B777 on takeoff roll had main gear steering warning light and horn with message warning light. Cap...

Attributes
ACN	496879
Time
Date	200012
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : iad.airport
State Reference	VA
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : iad.tower
Operator	common carrier : air carrier
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	ground : takeoff roll
Route In Use	departure : other published ifr departure
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time type : 1009
ASRS Report	496879
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	aircraft equipment other aircraft equipment : status display other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

At XA35Z we were cleared onto runway 30 iad. As we were taking the runway, we were cleared for takeoff. We were having an en route check by WX wxxx this time. As I added power for takeoff, the main gear steering warning light and horn went off. I immediately started the power back and then noticed it was the main gear steering warning light. I have had this warning light a few times before, including on my IOE as well as transition school in the simulator. Both times, the guidance I received was to continue as the light will go out as the trucks straighten out. Using this information, I reapplied takeoff power anticipating that the light would go out. At this point, I was well above 80 KTS and with emphasis on not aborting unless a non fly situation occurs, I made a captain's decision to continue the takeoff, as all other system were working normally. At V1, horn/warning light all went out and the takeoff was otherwise uneventful. We called maintenance and briefed them on what happened and received a response to taxi/park very carefully. FYI -- this aircraft had numerous write-ups: inoperative autobrake system, fuel gauge problem, APU must be left running, etc. Wxxx completed a debrief.

Original NASA ASRS Text

Title: A B777 ON TKOF ROLL HAD MAIN GEAR STEERING WARNING LIGHT AND HORN WITH MESSAGE WARNING LIGHT. CAPT ELECTED TO CONTINUE TKOF AND AT V1 ALL WARNING LIGHTS WENT OUT.

Narrative: AT XA35Z WE WERE CLRED ONTO RWY 30 IAD. AS WE WERE TAKING THE RWY, WE WERE CLRED FOR TKOF. WE WERE HAVING AN ENRTE CHK BY WX WXXX THIS TIME. AS I ADDED PWR FOR TKOF, THE MAIN GEAR STEERING WARNING LIGHT AND HORN WENT OFF. I IMMEDIATELY STARTED THE PWR BACK AND THEN NOTICED IT WAS THE MAIN GEAR STEERING WARNING LIGHT. I HAVE HAD THIS WARNING LIGHT A FEW TIMES BEFORE, INCLUDING ON MY IOE AS WELL AS TRANSITION SCHOOL IN THE SIMULATOR. BOTH TIMES, THE GUIDANCE I RECEIVED WAS TO CONTINUE AS THE LIGHT WILL GO OUT AS THE TRUCKS STRAIGHTEN OUT. USING THIS INFO, I REAPPLIED TKOF PWR ANTICIPATING THAT THE LIGHT WOULD GO OUT. AT THIS POINT, I WAS WELL ABOVE 80 KTS AND WITH EMPHASIS ON NOT ABORTING UNLESS A NON FLY SIT OCCURS, I MADE A CAPT'S DECISION TO CONTINUE THE TKOF, AS ALL OTHER SYS WERE WORKING NORMALLY. AT V1, HORN/WARNING LIGHT ALL WENT OUT AND THE TKOF WAS OTHERWISE UNEVENTFUL. WE CALLED MAINT AND BRIEFED THEM ON WHAT HAPPENED AND RECEIVED A RESPONSE TO TAXI/PARK VERY CAREFULLY. FYI -- THIS ACFT HAD NUMEROUS WRITE-UPS: INOP AUTOBRAKE SYS, FUEL GAUGE PROB, APU MUST BE LEFT RUNNING, ETC. WXXX COMPLETED A DEBRIEF.

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.

A B777 on takeoff roll had main gear steering warning light and horn with message warning light. Captain elected to continue takeoff and at V1 all warning lights went out.