A BEECH BARON A55 ON TOUCHDOWN THE L MAIN GEAR BRAKE LOCKED UP AND THE ACFT DEPARTED THE RWY. CAUSE OF BRAKE FAILURE SUSPECTED TO BE IMPROPER INSTALLATION.

Narrative

UPON LNDG; L MAIN BRAKE LOCKED. THE ACFT THEN DEPARTED THE RWY 200-300 FT AFTER TOUCHDOWN. CAUSE OF BRAKE MALFUNCTION UNDETERMINED AT THIS TIME. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED AS SOON AS THE AIRPLANE TOUCHED DOWN; THE BRAKE LOCKED; SWINGING THE AIRPLANE TO THE L AND DEPARTING THE RWY FOR 200-300 FT. THE RPTR SAID THE SUSPECTED CAUSE IS THE IMPROPER INSTALLATION OF THE BRAKE ASSEMBLY. THE RPTR SAID THE SEQUENCE OF EVENTS WERE; THE AIRPLANE LANDED WITH A FLAT L STRUT AND A PART OF THE LNDG GEAR PROTRUDED DOWN AND CONTACTED THE BRAKE DISK LOCKING IT UP. THE RPTR STATED IT APPEARS AN AXLE SPACER OR SPACERS WERE NOT INSTALLED WHICH WOULD HAVE PREVENTED INTERFERENCE BTWN THE UPPER STRUT AND THE BRAKE DISK WHEN THE STRUT WAS FLAT. THE RPTR CAUTIONED THAT THE FINAL RPT HAS NOT BEEN MADE; BUT IT'S ALMOST A CERTAINTY THE MISSING SPACER WILL BE THE CAUSE. THE RPTR STATED THE DAMAGE TO THE ACFT REQUIRED REPLACEMENT OF MAIN GEAR DOORS; 2 PROPS; AND ENG SUDDEN STOPPAGE INSPECTION AND REPAIR. THE RPTR SAID THE NOSE GEAR AND MAIN GEAR STRUT EXTENSION APPEARED NORMAL WITH NO LEAKAGE DURING THE PREFLT CHK.