Individually Owned: 150,657
Corporate Owned: 137,281
O'hare Int'l Airport
Aircraft Accident/Incident Report
Chicago, Illinois 60666
Saturday, March 13, 1993 16:27 CST
NTSB Narrative Summary Released at Completion of Accident
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 Narrative
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.
Event Information
| Type of Event | Incident |
| Event Date | 3/13/1993 |
| Event Day of the Week | Saturday |
| Time of Event | 1627 |
| Event Time Zone | Central Standard Time |
| Event City | CHICAGO |
| Event State | ILLINOIS |
| Event Country | -- |
| Zipcode of the event site | 60666 |
| Event Date Year | 1993 |
| Event Date Month | 3 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | |
| Event Location Longitude | |
| Event Location Airport | O'HARE INT'L |
| Event Location Nearest Airport ID | ORD |
| Indicates whether the acc/inc occurred off or on an airport | On Airport |
| Distance from airport in statute miles | 0 |
| Degrees magnetic from airport | 0 |
| Airport Elevation | 667 |
| Weather Briefing Completeness | Not pertinent |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1632 Central Standard Time |
| Direction of event from weather observation facility (degrees) | 1 |
| Weather Observation Facility ID | ORD |
| Elevation of weather observation facility | 667 |
| Distance of event from weather observation facility (units?) | 1 |
| Time Zone of the weather observation | CST |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 0 |
| Lowest Non-Ceiling Height | 3600 |
| Sky/Lowest/Cloud Conditions | Scattered |
| Sky Condition for Lowest Ceiling | None |
| Visibility Runway Visual Range (Feet) | 0 |
| Visibility Runway Visual Value (Statute Miles) | 0 |
| Visibility (Statute Miles) | 12 |
| Air Temperature at event time (in degrees celsius) | -7 |
| Dew Point at event time (in degress fahrenheit) | -16 |
| Wind Direction (degrees magnetic) | 340 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 20 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Unknown |
| Wind Gust (knots) | 0 |
| Altimeter Setting at event time (in. Hg) | 30 |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | Unknown |
| METAR weather report | -- |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | 0 |
| On Ground, Minor Injuries | 0 |
| On Ground, Serious Injuries | 0 |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 103 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 5004 |
| NTSB Notification Source | -- |
| NTSB Notification Date | Mar 13 1993 12:00AM |
| NTSB Notification Time | 1700 |
| Fiche Number and/or location -used to find docket information | 48312 |
| Date of most recent change to record | Dec 11 2000 1:11PM |
| User who most recently changed record | dbo |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N895US |
| NTSB Number | CHI93IA110 |
| Missing Aircraft Indicator | N |
| Federal Aviation Reg. Part | Part 121: Air Carrier |
| Type of Flight Plan filed | IFR |
| Flight plan Was Activated? | -- |
| Damage | Minor |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | FOKKER |
| Aircraft Model | 100 |
| Aircraft Series Identifier | 100 |
| Aircraft Serial Number | 11380 |
| Certified Max Gross Weight | 91500 |
| Aircraft Category | Airplane |
| Aircraft Registration Class | U.S. Registered/U.S. Soil |
| Aircraft is a homebuilt? | No |
| Flight Crew Seats | -- |
| Cabin Crew Seats | -- |
| Passenger Seats | -- |
| Total number of seats on the aircraft | 111 |
| Number of Engines | 2 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Continuous Airworthiness |
| Date of Last Inspection | Mar 13 1993 12:00AM |
| Airframe hours since last inspection | -- |
| Airframe Hours | 2293 |
| ELT Installed | No |
| ELT Activated | No |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | WILMINGTON TRUST COMPANY |
| Aircraft Owner Street Address | RODNEY SQUARE NORTH |
| Aircraft Owner City | WILMINGTON |
| Aircraft Owner State | DE |
| Aircraft Owner Country | |
| Aircraft Owner Zipcode | 19890 |
| Operator is an individual? | -- |
| Operator Name | USAIR |
| Operator Same as Owner? | No |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | No |
| Operator Street Address | 2345 CRYSTAL DRIVE |
| Operator City | ARLINGTON |
| Operator State | VA |
| Operator Country | |
| Operator Zip code | 22227 |
| Operator Code | USAA |
| Owner has at least one certificate | Yes - certificate holder |
| Other Operator of large aircraft? | No |
| Certified for Part 133 or 137 Operation | Unknown |
| Operator Certificate Number | -- |
| Indicates whether an air carrier operation was scheduled or not | Scheduled |
| Indicates Domestic or International Flight | Domestic |
| Operator carrying Pax/Cargo/Mail | Passenger Only |
| Type of Flying (Per_Bus / Primary) | Unknown |
| Second Pilot on Board | Yes |
| Departure Point Same as Event | No |
| Departure Airport Code | CLT |
| Departure City | CHARLOTTE |
| Departure State | NC |
| Departure Country | |
| Departure Time | 1422 |
| Departure Time Zone | EST |
| Destination Same as Local Flt | crash at destination city |
| Destination Airport Code | ORD |
| Destination City | |
| Destination State | |
| Destination Country | |
| Specific Phase of Flight | Landing |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Jan 2 2001 10:30AM |
| User who most recently changed record | dbo |
| Since inspection or accident | -- |
| Event Location Runway Number and Location | 4R |
| Runway Length | 8071 |
| Runway Width | 150 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |