Individually Owned: 150,657
Corporate Owned: 137,281
Aircraft Accident/Incident Report
Denver, Colorado 80249
Sunday, April 30, 2000 18:40 MDT
NTSB Narrative Summary Released at Completion of Accident
Power on the no. 1 engine 'rolled back' (dropped to flight idle) while the airplane was in IMC at FL 290. The operator reported considerable convective cloud and thunderstorm activity in the area, with cloud tops reaching FL500. When the flight descended to FL 260, power on nos. 2 and 4 engines also rolled back. As the airplane passed 12,500 feet msl, power returned to the three idling engines. The flight landed without further incident. The airplane was equipped with four unmodified Honeywell ALF502R engines. In certain temperature and moisture conditions, the engines become susceptible to ice accumulation on the supercharger exit guide vanes. This reduces core engine airflow, resulting in a loss of power. Early airworthiness directives prohibited flight in icing conditions above 26,000 feet and at an outside air temperature above -40 degrees C. SAT within 30 nm of thunderstorms. Some operators were granted waivers from these ADs. Recent airworthiness directives mandate certain engine modifications be made by December 2002. Newer models of the airplane feature redesigned engines.
NTSB Probable Cause Narrative
The accumulation of ice on the supercharger exit guide vanes that reduced core engine airflow, resulting in a loss of power. Factors were the clouds and icing conditions.
Event Information
| Type of Event | Incident |
| Event Date | 4/30/2000 |
| Event Day of the Week | Sunday |
| Time of Event | 1840 |
| Event Time Zone | Mountain Daylight Time |
| Event City | DENVER |
| Event State | COLORADO |
| Event Country | -- |
| Zipcode of the event site | 80249 |
| Event Date Year | 2000 |
| Event Date Month | 4 |
| 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 | Pilot |
| Time of the weather observation | 0 |
| Direction of event from weather observation facility (degrees) | 0 |
| Weather Observation Facility ID | |
| Elevation of weather observation facility | 0 |
| Distance of event from weather observation facility (units?) | 0 |
| Time Zone of the weather observation | |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 13000 |
| Lowest Non-Ceiling Height | 6000 |
| 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) | 23 |
| Dew Point at event time (in degress fahrenheit) | 5 |
| Wind Direction (degrees magnetic) | 100 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 8 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | 0 |
| Altimeter Setting at event time (in. Hg) | 29 |
| 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 | 20 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 5021 |
| NTSB Notification Source | faa nw operations center |
| NTSB Notification Date | Apr 30 2000 12:00AM |
| NTSB Notification Time | 1959 |
| Fiche Number and/or location -used to find docket information | IMAGE |
| Date of most recent change to record | Jul 10 2001 4:17PM |
| User who most recently changed record | MONR |
| Basic weather conditions | Instrument Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | CFBAO |
| NTSB Number | DEN00IA080 |
| Missing Aircraft Indicator | N |
| Federal Aviation Reg. Part | Part 129: Foreign |
| 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 146-200 |
| Aircraft Series Identifier | BAE 146-20 |
| Aircraft Serial Number | E2111 |
| Certified Max Gross Weight | -- |
| 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 | -- |
| Number of Engines | 4 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Continuous Airworthiness |
| Date of Last Inspection | Apr 11 2000 12:00AM |
| Airframe hours since last inspection | 160 |
| Airframe Hours | 28649 |
| ELT Installed | Yes |
| ELT Activated | Unknown |
| ELT Aided Location of Event Site | Unknown |
| ELT Type | -- |
| Aircraft Owner Name | AIR BC, LTD. |
| Aircraft Owner Street Address | 5520 MILLER RD. |
| Aircraft Owner City | RICHMOND, BC |
| Aircraft Owner State | -- |
| Aircraft Owner Country | USA |
| Aircraft Owner Zipcode | -- |
| Operator is an individual? | No |
| Operator Name | AIR BC, LTD. |
| Operator Same as Owner? | Yes |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | Yes |
| Operator Street Address | 5520 MILLER RD. |
| Operator City | RICHMOND, BC |
| Operator State | -- |
| Operator Country | USA |
| Operator Zip code | -- |
| Operator Code | ABL |
| Owner has at least one certificate | Yes - certificate holder |
| Other Operator of large aircraft? | -- |
| Certified for Part 133 or 137 Operation | -- |
| Operator Certificate Number | -- |
| Indicates whether an air carrier operation was scheduled or not | Scheduled |
| Indicates Domestic or International Flight | International |
| Operator carrying Pax/Cargo/Mail | Passenger Only |
| Type of Flying (Per_Bus / Primary) | -- |
| Second Pilot on Board | Yes |
| Departure Point Same as Event | No |
| Departure Airport Code | YWG |
| Departure City | WINNIPEG |
| Departure State | CD |
| Departure Country | |
| Departure Time | 1730 |
| Departure Time Zone | CDT |
| Destination Same as Local Flt | -- |
| Destination Airport Code | DEN |
| Destination City | DENVER |
| Destination State | CO |
| Destination Country | |
| Specific Phase of Flight | -- |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Dec 4 2014 2:46PM |
| User who most recently changed record | broda |
| 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 | -- |