Individually Owned: 150,657
Corporate Owned: 137,281
Aircraft Accident/Incident Report
Denver, Colorado 80249
Friday, December 20, 1996 17:50 MST
NTSB Narrative Summary Released at Completion of Accident
An Air Wisconsin Airline flight, operating as United Express Flight 684, had been cleared to descend from FL190 to 13,000 feet on the Thompson One Arrival into Denver. As the airplane was passing 14,000 feet, it encountered unreported and unanticipated clear air turbulence. Two flight attendants, making their pre-landing check of the cabin, were seriously injured. One flight attendant received fractures to her pelvis, collarbone, and two ribs. The other flight attendant sustained a fractured ankle.
NTSB Probable Cause Narrative
an inflight encounter with unreported and unanticipated clear air turbulence during landing descent.
Event Information
| Type of Event | Accident |
| Event Date | 12/20/1996 |
| Event Day of the Week | Friday |
| Time of Event | 1750 |
| Event Time Zone | Mountain Standard Time |
| Event City | DENVER |
| Event State | COLORADO |
| Event Country | -- |
| Zipcode of the event site | 80249 |
| Event Date Year | 1996 |
| Event Date Month | 12 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | |
| Event Location Longitude | |
| Event Location Airport | |
| Event Location Nearest Airport ID | |
| Indicates whether the acc/inc occurred off or on an airport | Off Airport/Airstrip |
| Distance from airport in statute miles | -- |
| Degrees magnetic from airport | -- |
| Airport Elevation | -- |
| Weather Briefing Completeness | Unknown |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1753 Mountain Standard Time |
| Direction of event from weather observation facility (degrees) | 130 |
| Weather Observation Facility ID | DEN |
| Elevation of weather observation facility | 5431 |
| Distance of event from weather observation facility (units?) | 30 |
| Time Zone of the weather observation | MST |
| Lighting Conditions | Night/Bright |
| Lowest Ceiling Height | 16000 |
| Lowest Non-Ceiling Height | 12000 |
| Sky/Lowest/Cloud Conditions | Scattered |
| Sky Condition for Lowest Ceiling | Broken |
| Visibility Runway Visual Range (Feet) | 0 |
| Visibility Runway Visual Value (Statute Miles) | 0 |
| Visibility (Statute Miles) | 10 |
| Air Temperature at event time (in degrees celsius) | 3 |
| Dew Point at event time (in degress fahrenheit) | -7 |
| Wind Direction (degrees magnetic) | 20 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 3 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | 0 |
| Altimeter Setting at event time (in. Hg) | 29 |
| Density Altitude (feet) | 9453 |
| Intensity of Precipitation | Unknown |
| METAR weather report | -- |
| Event Highest Injury | Serious |
| On Ground, Fatal Injuries | 0 |
| On Ground, Minor Injuries | 0 |
| On Ground, Serious Injuries | 0 |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 14 |
| Injury Total Serious | 2 |
| Injury Total All | 2 |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 1677 |
| NTSB Notification Source | -- |
| NTSB Notification Date | Dec 20 1996 12:00AM |
| NTSB Notification Time | 2041 |
| Fiche Number and/or location -used to find docket information | IMAGE |
| Date of most recent change to record | Dec 8 2000 10:29AM |
| User who most recently changed record | dbo |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N606AW |
| NTSB Number | FTW97LA070 |
| Missing Aircraft Indicator | N |
| Federal Aviation Reg. Part | Part 121: Air Carrier |
| Type of Flight Plan filed | IFR |
| Flight plan Was Activated? | -- |
| Damage | None |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | British Aerospace |
| Aircraft Model | BAE 146-200A |
| Aircraft Series Identifier | BAE 146-20 |
| Aircraft Serial Number | E2033 |
| Certified Max Gross Weight | 89500 |
| 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 | 91 |
| Number of Engines | 4 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Continuous Airworthiness |
| Date of Last Inspection | Dec 17 1996 12:00AM |
| Airframe hours since last inspection | 31 |
| Airframe Hours | 21438 |
| ELT Installed | No |
| ELT Activated | Unknown |
| ELT Aided Location of Event Site | Unknown |
| 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 | AIR WISCONSIN AIRLINES |
| Operator Same as Owner? | No |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | No |
| Operator Street Address | W6390 CHALLENGER DR., STE 203 |
| Operator City | APPLETON |
| Operator State | WI |
| Operator Country | |
| Operator Zip code | 54915 |
| Operator Code | AWA |
| 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 | EGE |
| Departure City | EAGLE |
| Departure State | CO |
| Departure Country | |
| Departure Time | 1730 |
| Departure Time Zone | MST |
| Destination Same as Local Flt | crash at destination city |
| Destination Airport Code | DEN |
| Destination City | |
| Destination State | CO |
| Destination Country | |
| Specific Phase of Flight | Descent |
| 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 | 0 |
| Runway Length | -- |
| Runway Width | -- |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |