A learjet 24F while taxiing lost steering and brake control and departed the taxiway due to a cracke...

Attributes
ACN	388414
Time
Date	199712
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bna
State Reference	TN
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	other
Make Model Name	Learjet 24
Operating Under FAR Part	Part 135
Flight Phase	ground other : taxi other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 225 flight time total : 3700 flight time type : 1400
ASRS Report	388414
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other anomaly other other anomaly other
Independent Detector	other flight crewa other other : unspecified cockpit
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

After receiving taxi clearance I proceeded from the cargo ramp down taxiway a towards runway 20R in xxyv. A learjet 24F model. As I approached the end of taxiway a, on a downhill slope, I applied braking to hold short of the active runway 20R. Normal brake pressure was not effective, nor was excessive brake pressure. At this time the situation compounded by the aircraft drifting left of the taxiway centerline regardless of right rudder inputs, differential braking, and the use of the control wheel master switch. I did not have any steering or braking control of the aircraft. Realizing that the emergency brake was the next required option, I then used the emergency but still rolled off of the taxiway before coming to a stop. I was unable to use the remaining taxiway available due to the loss of steering and curving taxiway. Maintenance later noted a cracked brake housing on the right side landing gear and it was confirmed that the brake fluid was leaking through the crack.

Original NASA ASRS Text

Title: A LEARJET 24F WHILE TAXIING LOST STEERING AND BRAKE CTL AND DEPARTED THE TXWY DUE TO A CRACKED BRAKE HOUSING CAUSING COMPLETE LOSS OF HYD FLUID.

Narrative: AFTER RECEIVING TAXI CLRNC I PROCEEDED FROM THE CARGO RAMP DOWN TXWY A TOWARDS RWY 20R IN XXYV. A LEARJET 24F MODEL. AS I APCHED THE END OF TXWY A, ON A DOWNHILL SLOPE, I APPLIED BRAKING TO HOLD SHORT OF THE ACTIVE RWY 20R. NORMAL BRAKE PRESSURE WAS NOT EFFECTIVE, NOR WAS EXCESSIVE BRAKE PRESSURE. AT THIS TIME THE SIT COMPOUNDED BY THE ACFT DRIFTING L OF THE TXWY CTRLINE REGARDLESS OF R RUDDER INPUTS, DIFFERENTIAL BRAKING, AND THE USE OF THE CTL WHEEL MASTER SWITCH. I DID NOT HAVE ANY STEERING OR BRAKING CTL OF THE ACFT. REALIZING THAT THE EMER BRAKE WAS THE NEXT REQUIRED OPTION, I THEN USED THE EMER BUT STILL ROLLED OFF OF THE TXWY BEFORE COMING TO A STOP. I WAS UNABLE TO USE THE REMAINING TXWY AVAILABLE DUE TO THE LOSS OF STEERING AND CURVING TXWY. MAINT LATER NOTED A CRACKED BRAKE HOUSING ON THE R SIDE LNDG GEAR AND IT WAS CONFIRMED THAT THE BRAKE FLUID WAS LEAKING THROUGH THE CRACK.

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.

A learjet 24F while taxiing lost steering and brake control and departed the taxiway due to a cracked brake housing causing complete loss of hydraulic fluid.