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NTSB Report
July 18, 1990 · Mitsubishi MU-300 · N800TJ
Milwaukee, WI
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 18, 1990
Injury Outcomes
No injuries (6 uninjured)
Location
Milwaukee, WI
Aircraft
Mitsubishi MU-300
Tail Number
N800TJ
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CHI90LA189
THE PILOT STATES HE LANDED SOFTLY, COMMENCED AERODYNAMIC BRAKING, THEN LOWERED THE NOSEWHEEL TO THE RUNWAY AND APPLIED WHEEL BRAKES WITH ANTI-SKID ENGAGED. HE STATES THERE WAS NO RESPONSE TO BRAKES. THE AIRPLANE OVERRAN THE RUNWAY, SUSTAINING SUBSTANTIAL DAMAGE. TEST OF THE BRAKE SYSTEM REVEALED NO DISCREPANCY. MAIN LANDING GEAR STRUTS WERE FOUND OVERPRESSURIZED. AN ANTI-SKID LOGIC CIRCUIT INTERRUPTS BRAKE ACTIVATION UNTIL LOAD SWITCHES ON THE MAIN STRUTS SENSE WEIGHT ON THE WHEELS (STRUTS LESS THAN FULLY EXTENDED). THERE WERE THUNDERSTORMS AND RAIN IN THE VICINITY AND THE RUNWAY WAS WET. THE RIGHT MAIN TIRE TRACK WAS IDENTIFIABLE AS A CLEAN STRIP ACROSS THE ASPHALT AND WHITE PAINT MARKINGS AT RUNWAY DEPARTURE END.
NTSB Probable Cause
THE PILOT'S DELAYED DETERMINATION OF TRACTION OR BRAKING ACTION UNTIL TOO LITTLE RUNWAY REMAINED TO GO AROUND OR TO EMPLOY ALTERNATE MEANS OF ACTIVIATING THE BRAKES. CONTRIBUTING TO THE ACCIDENT WAS THE OVERSERVICING OF THE MAIN GEAR STRUTS.
Full Narrative
THE PILOT STATES HE LANDED SOFTLY, COMMENCED AERODYNAMIC BRAKING, THEN LOWERED THE NOSEWHEEL TO THE RUNWAY AND APPLIED WHEEL BRAKES WITH ANTI-SKID ENGAGED. HE STATES THERE WAS NO RESPONSE TO BRAKES. THE AIRPLANE OVERRAN THE RUNWAY, SUSTAINING SUBSTANTIAL DAMAGE. TEST OF THE BRAKE SYSTEM REVEALED NO DISCREPANCY. MAIN LANDING GEAR STRUTS WERE FOUND OVERPRESSURIZED. AN ANTI-SKID LOGIC CIRCUIT INTERRUPTS BRAKE ACTIVATION UNTIL LOAD SWITCHES ON THE MAIN STRUTS SENSE WEIGHT ON THE WHEELS (STRUTS LESS THAN FULLY EXTENDED). THERE WERE THUNDERSTORMS AND RAIN IN THE VICINITY AND THE RUNWAY WAS WET. THE RIGHT MAIN TIRE TRACK WAS IDENTIFIABLE AS A CLEAN STRIP ACROSS THE ASPHALT AND WHITE PAINT MARKINGS AT RUNWAY DEPARTURE END.
Flight
Event TypeAccident
Event Time14:00 CDT
Nearest AirportTimmerman (0nm N)
Runway33R
Runway Length4107 ft
Runway Width75 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftMitsubishi MU-300
Tail NumberN800TJ
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines2
Engine TypeTurbofan
Engine DetailsP&W · JT15D · Turbofan · 2500
Seats10
People & Injuries
Injury SummaryNo injuries (6 uninjured)
Fatal0
Serious0
Minor0
Uninjured6
Total6
Crew 1Age 34 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind280° @ 14 kt
Visibility2 sm
CeilingBroken clouds 4000 ft
Temperature / Dew Point0 C
Altimeter30.00 inHg
Observation Time19:02
Weather SourceWFAC