Narrative:

Upon landing, left main brake locked. The aircraft then departed the runway 200-300 ft after touchdown. Cause of brake malfunction undetermined at this time. Callback conversation with reporter revealed the following information: the reporter stated as soon as the airplane touched down, the brake locked, swinging the airplane to the left and departing the runway for 200-300 ft. The reporter said the suspected cause is the improper installation of the brake assembly. The reporter said the sequence of events were, the airplane landed with a flat left strut and a part of the landing gear protruded down and contacted the brake disk locking it up. The reporter stated it appears an axle spacer or spacers were not installed which would have prevented interference between the upper strut and the brake disk when the strut was flat. The reporter cautioned that the final report has not been made, but it's almost a certainty the missing spacer will be the cause. The reporter stated the damage to the aircraft required replacement of main gear doors, 2 propellers, and engine sudden stoppage inspection and repair. The reporter said the nose gear and main gear strut extension appeared normal with no leakage during the preflight check.

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Original NASA ASRS Text

Title: 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.

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.