EMB170 flight crew rejects two takeoffs after speeds drop out of FMC during takeoff roll. The third ...

Attributes
ACN	774944
Time
Date	200802
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 170/175 ER&LR
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 : multi engine pilot : instrument pilot : cfi pilot : atp pilot : commercial
Experience	flight time last 90 days : 240 flight time total : 5382 flight time type : 510
ASRS Report	774944
Person 2
Affiliation	government : faa
Function	controller : local
Events
Anomaly	aircraft equipment problem : less severe non adherence : company policies
Independent Detector	other flight crewa
Resolutory Action	flight crew : rejected takeoff flight crew : overcame equipment problem
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

Aircraft had new load in FMS. We were originally given xxr for departure; but that was then changed to xxl. The takeoff roll began normally with the first officer as PF. Around 100 KTS the first officer declared that the speeds had dropped out. I confirmed that and called for the abort. The abort itself was uneventful. We cleared the runway completed the checklist and asked ATC for a minute to troubleshoot the problem. We observed that runway xxr had been inadvertently left in the FMS. We could see no other errors or abnormalities. Everything was double-checked and the correct runway for departure (xxr this time) was programmed into the FMS. All checklists were completed and we initiated a takeoff on runway xxr. The same problem was observed; and the takeoff was once again aborted uneventfully. This time the aircraft was parked on the ramp at the direction of ATC; the #2 engine was shut down to conserve fuel and I called maintenance control. At the direction of maintenance all engines were shut down and all power removed from the aircraft and system. Again at the direction of maintenance personnel the aircraft was then once again started and programmed for departure. Maintenance believed this could solve the problem. All checklists were completed and a normal and uneventful takeoff was made off xxr with no abnormalities observed.

Original NASA ASRS Text

Title: EMB170 FLT CREW REJECTS TWO TKOFS AFTER SPEEDS DROP OUT OF FMC DURING TKOF ROLL. THE THIRD ATTEMPT IS SUCCESSFUL AFTER COMPLETE POWER DOWN AND RESTART.

Narrative: ACFT HAD NEW LOAD IN FMS. WE WERE ORIGINALLY GIVEN XXR FOR DEP; BUT THAT WAS THEN CHANGED TO XXL. THE TKOF ROLL BEGAN NORMALLY WITH THE FO AS PF. AROUND 100 KTS THE FO DECLARED THAT THE SPDS HAD DROPPED OUT. I CONFIRMED THAT AND CALLED FOR THE ABORT. THE ABORT ITSELF WAS UNEVENTFUL. WE CLRED THE RWY COMPLETED THE CHKLIST AND ASKED ATC FOR A MINUTE TO TROUBLESHOOT THE PROB. WE OBSERVED THAT RWY XXR HAD BEEN INADVERTENTLY LEFT IN THE FMS. WE COULD SEE NO OTHER ERRORS OR ABNORMALITIES. EVERYTHING WAS DOUBLE-CHKED AND THE CORRECT RWY FOR DEP (XXR THIS TIME) WAS PROGRAMMED INTO THE FMS. ALL CHKLISTS WERE COMPLETED AND WE INITIATED A TKOF ON RWY XXR. THE SAME PROB WAS OBSERVED; AND THE TKOF WAS ONCE AGAIN ABORTED UNEVENTFULLY. THIS TIME THE ACFT WAS PARKED ON THE RAMP AT THE DIRECTION OF ATC; THE #2 ENG WAS SHUT DOWN TO CONSERVE FUEL AND I CALLED MAINT CTL. AT THE DIRECTION OF MAINT ALL ENGS WERE SHUT DOWN AND ALL PWR REMOVED FROM THE ACFT AND SYS. AGAIN AT THE DIRECTION OF MAINT PERSONNEL THE ACFT WAS THEN ONCE AGAIN STARTED AND PROGRAMMED FOR DEP. MAINT BELIEVED THIS COULD SOLVE THE PROB. ALL CHKLISTS WERE COMPLETED AND A NORMAL AND UNEVENTFUL TKOF WAS MADE OFF XXR WITH NO ABNORMALITIES OBSERVED.

Data retrieved from NASA's ASRS site as of May 2009 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.

EMB170 flight crew rejects two takeoffs after speeds drop out of FMC during takeoff roll. The third attempt is successful after complete power down and restart.