Flight crew of LR60 has high speed, high gross weight rejected takeoff. They avoid running through t...

Attributes
ACN	406435
Time
Date	199806
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : iad
State Reference	DC
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Learjet 60
Operating Under FAR Part	Part 91
Navigation In Use	Other Other
Flight Phase	climbout : takeoff other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 140 flight time total : 3600 flight time type : 500
ASRS Report	406435
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 125 flight time total : 4500 flight time type : 95
ASRS Report	406444
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : unable
Consequence	other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

During takeoff from runway 1L at iad I was involved in a high speed high gross weight rejected takeoff due to a catastrophic failure of both right main tires. The approximately speed of the aircraft at the time of the abort was 120 KTS. The calculated V1 speed for the conditions was 131 KTS. The tire failure subsequently resulted in the disintegration of the entire right brake assembly which in turn severed the hydraulic lines and electrical connections to the anti skid and squat switch system. Because of this the thrust reversers were inoperative. Directional control was maintained throughout the entire abort procedure. However, due to very limited brake effectiveness and the high gross weight of the aircraft, we were unable to adequately stop the aircraft in the remaining runway length available. In order to avoid further damage to the aircraft by running through the runway end lights, we elected to exit the left side of the runway just short of the end at a speed of 20-30 KTS. At this point I have no explanation as to why the tires failed. All 4 tires were just recently replaced and visually were in excellent condition.

Original NASA ASRS Text

Title: FLC OF LR60 HAS HIGH SPD, HIGH GROSS WT REJECTED TKOF. THEY AVOID RUNNING THROUGH THE END RWY LIGHTS BY EXITING THE L SIDE OF THE RWY.

Narrative: DURING TKOF FROM RWY 1L AT IAD I WAS INVOLVED IN A HIGH SPD HIGH GROSS WT REJECTED TKOF DUE TO A CATASTROPHIC FAILURE OF BOTH R MAIN TIRES. THE APPROX SPD OF THE ACFT AT THE TIME OF THE ABORT WAS 120 KTS. THE CALCULATED V1 SPD FOR THE CONDITIONS WAS 131 KTS. THE TIRE FAILURE SUBSEQUENTLY RESULTED IN THE DISINTEGRATION OF THE ENTIRE R BRAKE ASSEMBLY WHICH IN TURN SEVERED THE HYD LINES AND ELECTRICAL CONNECTIONS TO THE ANTI SKID AND SQUAT SWITCH SYS. BECAUSE OF THIS THE THRUST REVERSERS WERE INOP. DIRECTIONAL CTL WAS MAINTAINED THROUGHOUT THE ENTIRE ABORT PROC. HOWEVER, DUE TO VERY LIMITED BRAKE EFFECTIVENESS AND THE HIGH GROSS WT OF THE ACFT, WE WERE UNABLE TO ADEQUATELY STOP THE ACFT IN THE REMAINING RWY LENGTH AVAILABLE. IN ORDER TO AVOID FURTHER DAMAGE TO THE ACFT BY RUNNING THROUGH THE RWY END LIGHTS, WE ELECTED TO EXIT THE L SIDE OF THE RWY JUST SHORT OF THE END AT A SPD OF 20-30 KTS. AT THIS POINT I HAVE NO EXPLANATION AS TO WHY THE TIRES FAILED. ALL 4 TIRES WERE JUST RECENTLY REPLACED AND VISUALLY WERE IN EXCELLENT CONDITION.

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.

Flight crew of LR60 has high speed, high gross weight rejected takeoff. They avoid running through the end runway lights by exiting the left side of the runway.