Narrative:

After a normal landing and rollout at approximately 70 KTS, the aircraft, an light transport, began to depart the runway centerline to the left. Up to this point thrust reverse and normal braking were in effect. Reverse was slowly being brought to idle when aircraft began to deviate to left. Right rudder up to full input and heavy right brake pressure had no effect. Right nosewheel steering (electric) and an attempt at right differential thrust reverse also had no effect. All this occurred in a matter of seconds, and at the time, with no apparent reason as to why. The landing had been made after execution of the ILS to runway 27R at fll (9000 ft) under VFR conditions with light wind, (320 degrees at 4 KTS) and a dry runway. At approximately 4000 ft from approach end of runway, the aircraft was deviating to the left at approximately 30 degrees from runway centerline. At this time, maximum braking and full reverse thrust were being applied in an attempt to stop the aircraft. The aircraft deviated through a grassy area and came to a stop on a hard surface taxiway south of runway 27R. There were no injuries, no damage to airport property, and no substantial damage to the aircraft. The aircraft is in maintenance and so far, it has been found that right power brake valve had broken. A rod which pushes on the piston had sheared and wedged itself between the right power brake assembly and the lever which is linked to the rudder pedal. This is why the right brake pedal never went flat (to the floor) and why I had no indication that there was no right brake. (I felt resistance on the right side, as if I had right brake). Manufacturer has been notified and a report is being sent to them so that any action or maintenance changes to light transport can be researched.

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Original NASA ASRS Text

Title: LOSS OF ACFT CTL LNDG ROLLOUT.

Narrative: AFTER A NORMAL LNDG AND ROLLOUT AT APPROX 70 KTS, THE ACFT, AN LTT, BEGAN TO DEPART THE RWY CTRLINE TO THE L. UP TO THIS POINT THRUST REVERSE AND NORMAL BRAKING WERE IN EFFECT. REVERSE WAS SLOWLY BEING BROUGHT TO IDLE WHEN ACFT BEGAN TO DEVIATE TO L. R RUDDER UP TO FULL INPUT AND HVY R BRAKE PRESSURE HAD NO EFFECT. R NOSEWHEEL STEERING (ELECTRIC) AND AN ATTEMPT AT R DIFFERENTIAL THRUST REVERSE ALSO HAD NO EFFECT. ALL THIS OCCURRED IN A MATTER OF SECONDS, AND AT THE TIME, WITH NO APPARENT REASON AS TO WHY. THE LNDG HAD BEEN MADE AFTER EXECUTION OF THE ILS TO RWY 27R AT FLL (9000 FT) UNDER VFR CONDITIONS WITH LIGHT WIND, (320 DEGS AT 4 KTS) AND A DRY RWY. AT APPROX 4000 FT FROM APCH END OF RWY, THE ACFT WAS DEVIATING TO THE L AT APPROX 30 DEGS FROM RWY CTRLINE. AT THIS TIME, MAX BRAKING AND FULL REVERSE THRUST WERE BEING APPLIED IN AN ATTEMPT TO STOP THE ACFT. THE ACFT DEVIATED THROUGH A GRASSY AREA AND CAME TO A STOP ON A HARD SURFACE TXWY S OF RWY 27R. THERE WERE NO INJURIES, NO DAMAGE TO ARPT PROPERTY, AND NO SUBSTANTIAL DAMAGE TO THE ACFT. THE ACFT IS IN MAINT AND SO FAR, IT HAS BEEN FOUND THAT R PWR BRAKE VALVE HAD BROKEN. A ROD WHICH PUSHES ON THE PISTON HAD SHEARED AND WEDGED ITSELF BTWN THE R PWR BRAKE ASSEMBLY AND THE LEVER WHICH IS LINKED TO THE RUDDER PEDAL. THIS IS WHY THE R BRAKE PEDAL NEVER WENT FLAT (TO THE FLOOR) AND WHY I HAD NO INDICATION THAT THERE WAS NO R BRAKE. (I FELT RESISTANCE ON THE R SIDE, AS IF I HAD R BRAKE). MANUFACTURER HAS BEEN NOTIFIED AND A RPT IS BEING SENT TO THEM SO THAT ANY ACTION OR MAINT CHANGES TO LTT CAN BE RESEARCHED.

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.