Anti-skid failure after landing. Aircraft ran off end of runway.

Attributes
ACN	303337
Time
Date	199504
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ucy
State Reference	TN
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Learjet 35
Operating Under FAR Part	Part 135
Navigation In Use	Other Other
Flight Phase	landing other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : cfi pilot : atp pilot : instrument
Experience	flight time last 90 days : 75 flight time total : 3014 flight time type : 1323
ASRS Report	303337
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Determined cause: faulty anti-skid control box. Lear wanted the control box to be removed, as soon as possible, and replaced (testing to be done). No injury. No aircraft damage. No property damage. The landing: at first the aircraft responded normally, including the anti-skid. Upon reaching the last 1500 ft (approximately), the anti-skid system seemed to stop functioning properly to a point to where it wasn't working at all. At this point attempts to restore pressure to the brakes were made, to which no pressure was encountered. With the remaining time left (just a second or two), focus was spent on maintaining directional control (off end of runway imminent) to minimize damage. Again, no damage was encountered! The anti-skid system was tested in union city, to which further testing has to be done. To summarize, brake pressure went from good to fair to nil. Note: anti-skid fault lights remained off throughout.

Original NASA ASRS Text

Title: ANTI-SKID FAILURE AFTER LNDG. ACFT RAN OFF END OF RWY.

Narrative: DETERMINED CAUSE: FAULTY ANTI-SKID CTL BOX. LEAR WANTED THE CTL BOX TO BE REMOVED, ASAP, AND REPLACED (TESTING TO BE DONE). NO INJURY. NO ACFT DAMAGE. NO PROPERTY DAMAGE. THE LNDG: AT FIRST THE ACFT RESPONDED NORMALLY, INCLUDING THE ANTI-SKID. UPON REACHING THE LAST 1500 FT (APPROX), THE ANTI-SKID SYS SEEMED TO STOP FUNCTIONING PROPERLY TO A POINT TO WHERE IT WASN'T WORKING AT ALL. AT THIS POINT ATTEMPTS TO RESTORE PRESSURE TO THE BRAKES WERE MADE, TO WHICH NO PRESSURE WAS ENCOUNTERED. WITH THE REMAINING TIME LEFT (JUST A SECOND OR TWO), FOCUS WAS SPENT ON MAINTAINING DIRECTIONAL CTL (OFF END OF RWY IMMINENT) TO MINIMIZE DAMAGE. AGAIN, NO DAMAGE WAS ENCOUNTERED! THE ANTI-SKID SYS WAS TESTED IN UNION CITY, TO WHICH FURTHER TESTING HAS TO BE DONE. TO SUMMARIZE, BRAKE PRESSURE WENT FROM GOOD TO FAIR TO NIL. NOTE: ANTI-SKID FAULT LIGHTS REMAINED OFF THROUGHOUT.

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.