Narrative:

After completing an instrument approach and landing as the PF, I gave the controls back to the captain. Before the flight, we assumed an airplane with a MEL deferred inoperative nose wheel steering (electro-hydraulic system). When inoperative, the nose wheel castors freely and steering in performed with differential braking and power at taxi speeds. As the captain turned off the active runway onto the taxiway, the plane kept turning past the centerline of the taxiway. That was my only hint that something was wrong. The plane in a matter of seconds, pivoted on the left wheel and the nose wheel came to rest of the pavement 12' into the grass. The captain commented that the right brake completely failed and the wind was blowing against the tail forcing the turn even further. Due to the slower than normal taxi speed, no damage was done and only a minor inconvenience was experienced. We had experienced a mushy right brake during a previous leg and had our maintenance crew look at it. They bled the brakes and put their blessing on it. Unfortunately, maintenance does not always fix the problem and we end up with a recurrence. Also having two problems together, namely the failed brake plus the inoperative steering compounded into loss of taxi control.

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Original NASA ASRS Text

Title: ACR SMT ENDS UP WITH NOSE GEAR OFF TXWY AFTER CLEARING ACTIVE RWY.

Narrative: AFTER COMPLETING AN INSTRUMENT APCH AND LNDG AS THE PF, I GAVE THE CONTROLS BACK TO THE CAPT. BEFORE THE FLT, WE ASSUMED AN AIRPLANE WITH A MEL DEFERRED INOPERATIVE NOSE WHEEL STEERING (ELECTRO-HYDRAULIC SYS). WHEN INOPERATIVE, THE NOSE WHEEL CASTORS FREELY AND STEERING IN PERFORMED WITH DIFFERENTIAL BRAKING AND PWR AT TAXI SPDS. AS THE CAPT TURNED OFF THE ACTIVE RWY ONTO THE TXWY, THE PLANE KEPT TURNING PAST THE CTRLINE OF THE TXWY. THAT WAS MY ONLY HINT THAT SOMETHING WAS WRONG. THE PLANE IN A MATTER OF SECONDS, PIVOTED ON THE LEFT WHEEL AND THE NOSE WHEEL CAME TO REST OF THE PAVEMENT 12' INTO THE GRASS. THE CAPT COMMENTED THAT THE RIGHT BRAKE COMPLETELY FAILED AND THE WIND WAS BLOWING AGAINST THE TAIL FORCING THE TURN EVEN FURTHER. DUE TO THE SLOWER THAN NORMAL TAXI SPD, NO DAMAGE WAS DONE AND ONLY A MINOR INCONVENIENCE WAS EXPERIENCED. WE HAD EXPERIENCED A MUSHY RIGHT BRAKE DURING A PREVIOUS LEG AND HAD OUR MAINT CREW LOOK AT IT. THEY BLED THE BRAKES AND PUT THEIR BLESSING ON IT. UNFORTUNATELY, MAINT DOES NOT ALWAYS FIX THE PROB AND WE END UP WITH A RECURRENCE. ALSO HAVING TWO PROBS TOGETHER, NAMELY THE FAILED BRAKE PLUS THE INOPERATIVE STEERING COMPOUNDED INTO LOSS OF TAXI CTL.

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.