Narrative:

Broke out at MDA, ILS 16R sea. Landed on 16R. The runway was clear but fog surrounded runway making the tower and terminal not visible. The tower told us to exit at the highspeed exit just as we were approaching it. We were not in a position to exit and we advised them that we would be unable. We were instructed to continue to the end of 16R 'without delay, traffic on a 2 mi final'. At approximately 1000 ft from the end of the runway the captain applied the brakes. I would estimate we were traveling at between 20-30 KTS at the time. The right brake was working but the left brake failed to engage. The brake pressure gauge showed hydraulic pressure but brake not working. The captain controled the aircraft with nose wheel steering and use of reverse thrust along with brakes. The aircraft yawed to the right. We ran off the end of the runway onto the overrun at about 5-10 KTS and stopped after using approximately 20-30 ft of overrun. There was no damage to the aircraft or the runway end lights. The tower did not see any of this due to the fog and therefore we did not report this to the tower. We taxied to parking at a very slow speed (walking pace). No further problems. Captain wrote up brakes, as 'very very weak'. Maintenance said left brake cylinder fluid was low, and filled and the signed off the item. Captain filled out a company irregularity form and advised our regional flight manager of the incident and the actions that we had taken. Callback conversation with reporter revealed the following information: reporter says he wasn't sure how far behind them the following aircraft was while they were extricating themselves from the overrun. He said it only took them a 'few seconds' to clear the runway. In discussing the aircraft brakes, he said that the same thing had happened to the same aircraft recently and the problem seems to have finally been fixed properly. Thus, he really believes they had a brake problem and not a slippery runway condition.

Google
 

Original NASA ASRS Text

Title: LTT OVERSHOOTS END OF RWY SLIGHTLY DUE TO BRAKE FAILURE.

Narrative: BROKE OUT AT MDA, ILS 16R SEA. LANDED ON 16R. THE RWY WAS CLR BUT FOG SURROUNDED RWY MAKING THE TWR AND TERMINAL NOT VISIBLE. THE TWR TOLD US TO EXIT AT THE HIGHSPEED EXIT JUST AS WE WERE APCHING IT. WE WERE NOT IN A POS TO EXIT AND WE ADVISED THEM THAT WE WOULD BE UNABLE. WE WERE INSTRUCTED TO CONTINUE TO THE END OF 16R 'WITHOUT DELAY, TFC ON A 2 MI FINAL'. AT APPROX 1000 FT FROM THE END OF THE RWY THE CAPT APPLIED THE BRAKES. I WOULD ESTIMATE WE WERE TRAVELING AT BTWN 20-30 KTS AT THE TIME. THE R BRAKE WAS WORKING BUT THE L BRAKE FAILED TO ENGAGE. THE BRAKE PRESSURE GAUGE SHOWED HYD PRESSURE BUT BRAKE NOT WORKING. THE CAPT CTLED THE ACFT WITH NOSE WHEEL STEERING AND USE OF REVERSE THRUST ALONG WITH BRAKES. THE ACFT YAWED TO THE R. WE RAN OFF THE END OF THE RWY ONTO THE OVERRUN AT ABOUT 5-10 KTS AND STOPPED AFTER USING APPROX 20-30 FT OF OVERRUN. THERE WAS NO DAMAGE TO THE ACFT OR THE RWY END LIGHTS. THE TWR DID NOT SEE ANY OF THIS DUE TO THE FOG AND THEREFORE WE DID NOT RPT THIS TO THE TWR. WE TAXIED TO PARKING AT A VERY SLOW SPD (WALKING PACE). NO FURTHER PROBLEMS. CAPT WROTE UP BRAKES, AS 'VERY VERY WEAK'. MAINT SAID L BRAKE CYLINDER FLUID WAS LOW, AND FILLED AND THE SIGNED OFF THE ITEM. CAPT FILLED OUT A COMPANY IRREGULARITY FORM AND ADVISED OUR REGIONAL FLT MGR OF THE INCIDENT AND THE ACTIONS THAT WE HAD TAKEN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR SAYS HE WASN'T SURE HOW FAR BEHIND THEM THE FOLLOWING ACFT WAS WHILE THEY WERE EXTRICATING THEMSELVES FROM THE OVERRUN. HE SAID IT ONLY TOOK THEM A 'FEW SECONDS' TO CLR THE RWY. IN DISCUSSING THE ACFT BRAKES, HE SAID THAT THE SAME THING HAD HAPPENED TO THE SAME ACFT RECENTLY AND THE PROBLEM SEEMS TO HAVE FINALLY BEEN FIXED PROPERLY. THUS, HE REALLY BELIEVES THEY HAD A BRAKE PROBLEM AND NOT A SLIPPERY RWY CONDITION.

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.