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NTSB Report
March 13, 1993 · Fokker 100 · N895US
Chicago, IL
Overview
Report Status
Probable Cause
Event Type
Incident
Date
March 13, 1993
Injury Outcomes
No injuries (103 uninjured)
Location
Chicago, IL
Aircraft
Fokker 100
Tail Number
N895US
Operator
Usair
Injuries
None
Aircraft Damage
Minor
NTSB Number
CHI93IA110
Down & locked indication of nose gear was not achieved for landing. Crew recycled gear, used alternate gear extension system & made a fly-by. After being told gear appeared to be extended, crew landed, but nose gear collapsed at end of landing roll. Right main outboard tire also blew-out during landing due to frozen brake. Investigation revealed nose-wheel well was susceptible to ice contamination. Nose gear down lock plunger was frozen & would not extend to down & locked position. At departure airport, slush had accumulated on nose gear down lock & froze. Use of alternate extension system would have dumped the 500 PSI hydraulic pressure that normally assisted in holding gear in extended position. USAir procedures stated that takeoff should not be made if slush or wet snow in excess of 1/2 inch covered runway. At least 1 inch of wet snow & slush was reported on departure runway, 22 minutes before departure; however, acting station manager did not follow USAir procedures that required reporting this to dispatcher & captain of flight.
NTSB Probable Cause
FAILURE OF THE COMPANY STATION MANAGER TO FOLLOW PROPER DISPATCH PROCEDURES, AND ICE ACCUMULATION ON THE NOSE GEAR LOCKING MECHANISM. FACTORS RELATED TO THE INCIDENT WERE: WET SNOW (SLUSH) ON THE RUNWAY AT THE DEPARTURE AIRPORT, AND INADEQUATE DESIGN WHICH ALLOWED ICE TO RENDER THE NOSE GEAR DOWNLOCK SYSTEM INOPERATIVE.
Full Narrative
DOWN & LOCKED INDICATION OF NOSE GEAR WAS NOT ACHIEVED FOR LANDING. CREW RECYCLED GEAR, USED ALTERNATE GEAR EXTENSION SYSTEM & MADE A FLY-BY. AFTER BEING TOLD GEAR APPEARED TO BE EXTENDED, CREW LANDED, BUT NOSE GEAR COLLAPSED AT END OF LANDING ROLL. RIGHT MAIN OUTBOARD TIRE ALSO BLEW-OUT DURING LANDING DUE TO FROZEN BRAKE. INVESTIGATION REVEALED NOSE- WHEEL WELL WAS SUSCEPTIBLE TO ICE CONTAMINATION. NOSE GEAR DOWN LOCK PLUNGER WAS FROZEN & WOULD NOT EXTEND TO DOWN & LOCKED POSITION. AT DEPARTURE AIRPORT, SLUSH HAD ACCUMULATED ON NOSE GEAR DOWN LOCK & FROZE. USE OF ALTERNATE EXTENSION SYSTEM WOULD HAVE DUMPED THE 500 PSI HYDRAULIC PRESSURE THAT NORMALLY ASSISTED IN HOLDING GEAR IN EXTENDED POSITION. USAIR PROCEDURES STATED THAT TAKEOFF SHOULD NOT BE MADE IF SLUSH OR WET SNOW IN EXCESS OF 1/2 INCH COVERED RUNWAY. AT LEAST 1 INCH OF WET SNOW & SLUSH WAS REPORTED ON DEPARTURE RUNWAY, 22 MINUTES BEFORE DEPARTURE; HOWEVER, ACTING STATION MANAGER DID NOT FOLLOW USAIR PROCEDURES THAT REQUIRED REPORTING THIS TO DISPATCHER & CAPTAIN OF FLIGHT.
Flight
Event TypeIncident
Event Time16:27 CST
Nearest AirportO'Hare Int'L (0nm N)
Runway4R
Runway Length8071 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftFokker 100
Tail NumberN895US
Aircraft CategoryAir
DamageMinor
OperatorUsair
Operating RulePart 121
Engines2
Engine TypeTurbofan
Engine DetailsRolls-Royce · TAY650-15 · Turbofan · 15100
Seats111
People & Injuries
Injury SummaryNo injuries (103 uninjured)
Fatal0
Serious0
Minor0
Uninjured103
Total103
Crew 1Age 36 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind340° @ 20 kt
Visibility12 sm
CeilingNone
Temperature / Dew Point19 C / 3 C
Altimeter30.00 inHg
Observation Time22:32
Weather SourceWFAC