BE76 pilot had taxiway excursion at bfi.

Attributes
ACN	490217
Time
Date	200010
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bfi.airport
State Reference	WA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : m98.tracon
Operator	general aviation : personal
Make Model Name	Duchess 76
Operating Under FAR Part	Part 91
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : cfi pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 100 flight time total : 737 flight time type : 120
ASRS Report	490217
Person 2
Affiliation	government : faa
Function	controller : ground
Qualification	controller : non radar
Events
Anomaly	aircraft equipment problem : critical excursion : taxiway other anomaly
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : insufficient time none taken : unable
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

During taxi checks at bfi, the right brake failed completely creating an inability to turn the BE76 duchess to the right. The aircraft had previously been turned left to align with the taxiway. The brakes were checked by the pilot, and found to be functioning properly prior to start. As the aircraft approached the taxiway edge, the brakes were pumped and differential power was applied. This, combined with full nosewheel deflection, was insufficient. Just prior to taxiway departure, the mixtures were placed in cut-off and the engines secured. The aircraft came to rest roughly 15 ft off the taxiway in grass. There was no damage nor injury.

Original NASA ASRS Text

Title: BE76 PLT HAD TXWY EXCURSION AT BFI.

Narrative: DURING TAXI CHKS AT BFI, THE R BRAKE FAILED COMPLETELY CREATING AN INABILITY TO TURN THE BE76 DUCHESS TO THE R. THE ACFT HAD PREVIOUSLY BEEN TURNED L TO ALIGN WITH THE TXWY. THE BRAKES WERE CHKED BY THE PLT, AND FOUND TO BE FUNCTIONING PROPERLY PRIOR TO START. AS THE ACFT APCHED THE TXWY EDGE, THE BRAKES WERE PUMPED AND DIFFERENTIAL PWR WAS APPLIED. THIS, COMBINED WITH FULL NOSEWHEEL DEFLECTION, WAS INSUFFICIENT. JUST PRIOR TO TXWY DEP, THE MIXTURES WERE PLACED IN CUT-OFF AND THE ENGS SECURED. THE ACFT CAME TO REST ROUGHLY 15 FT OFF THE TXWY IN GRASS. THERE WAS NO DAMAGE NOR INJURY.

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.