Individually Owned: 150,657
Corporate Owned: 137,281
El Dorado International Airport
Aircraft Accident/Incident Report
Bogota Colombia
Tuesady, August 26, 2008 6:35 UTC
NTSB Narrative Summary Released at Completion of Accident
Just after takeoff from a high-altitude airport, as the landing gear were being retracted, a “loud bang” emanated from the vicinity of the No. 3 turbofan engine. The exhaust gas temperature rose, followed by three or four lesser bangs, all of which indicated an engine stall/surge. The engine was secured in accordance with the checklist procedure, fuel was dumped, and the airplane returned to the airport without further incident. On-wing test bed testing first established a performance baseline for the engine, which was then tested with newly overhauled fan blades installed, and subsequently tested with a newly overhauled fan case installed in order to assess the effects of changing fan blade geometry and fan blade-to-fan case clearance. Initial testing of the engine did not result in an engine surge or any engine exceedences. An engine vane control trim check revealed that it was within the parameters for most of the engine power range, except for above the 90 percent corrected N2 speed, where it was slightly below the minimum value. Because the results did not significantly impact testing, the engine was not re-trimmed prior to testing the engine with new fan blades and a new fan case. Tests revealed that fan blade contour and shape had a bigger influence on the engine’s surge margin and low pressure compressor (LPC) stability line than the fan blade-to-fan case clearance variations within the range of test conditions. Fan blades that were within the engine manual limits – rounder leading edges with little to no erosion and proper chord length – had improved LPC efficiency and engine stability. The last engine test was conducted with the compressor variable vanes re-trimmed open, and within limits at the high speed range, with the results indicating further improvement in LPC efficiency and stability. While no single variable likely resulted in the engine surge, several variables, including blade edge contour, variable blade trim and high altitude, likely combined to produce the stall/surge.
NTSB Probable Cause Narrative
The combination of fan blade edge contour, variable blade trim, and the high altitude, which resulted in an engine surge.
Event Information
| Type of Event | Incident |
| Event Date | 8/26/2008 |
| Event Day of the Week | Tuesday |
| Time of Event | 635 |
| Event Time Zone | Coordinated Universal Time? Same as GMT |
| Event City | Bogota |
| Event State | -- |
| Event Country | COLOMBIA |
| Zipcode of the event site | -- |
| Event Date Year | 2008 |
| Event Date Month | 8 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | 044259N |
| Event Location Longitude | 0740923W |
| Event Location Airport | El Dorado International |
| Event Location Nearest Airport ID | SKBO |
| Indicates whether the acc/inc occurred off or on an airport | On Airport |
| Distance from airport in statute miles | -- |
| Degrees magnetic from airport | -- |
| Airport Elevation | 8356 |
| Weather Briefing Completeness | -- |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 700 Coordinated Universal Time? Same as GMT |
| Direction of event from weather observation facility (degrees) | -- |
| Weather Observation Facility ID | SKBO |
| Elevation of weather observation facility | 8356 |
| Distance of event from weather observation facility (units?) | -- |
| Time Zone of the weather observation | UTC |
| Lighting Conditions | Night |
| Lowest Ceiling Height | 7000 |
| Lowest Non-Ceiling Height | 1500 |
| Sky/Lowest/Cloud Conditions | Scattered |
| Sky Condition for Lowest Ceiling | Broken |
| Visibility Runway Visual Range (Feet) | -- |
| Visibility Runway Visual Value (Statute Miles) | -- |
| Visibility (Statute Miles) | 10 |
| Air Temperature at event time (in degrees celsius) | 11 |
| Dew Point at event time (in degress fahrenheit) | 11 |
| Wind Direction (degrees magnetic) | 280 |
| Variable Wind Indicator | Wind direction could be determined |
| Wind Speed (knots) | 5 |
| Wind Velocity Indicator | -- |
| Wind Gust Indicator | -- |
| Wind Gust (knots) | -- |
| Altimeter Setting at event time (in. Hg) | 30.29 |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | -- |
| METAR weather report | -- |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | -- |
| On Ground, Minor Injuries | -- |
| On Ground, Serious Injuries | -- |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 5 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 27632 |
| NTSB Notification Source | Aeronautica Civil de Colombia |
| NTSB Notification Date | Aug 26 2008 12:00AM |
| NTSB Notification Time | -- |
| Fiche Number and/or location -used to find docket information | -- |
| Date of most recent change to record | Jan 11 2011 12:25PM |
| User who most recently changed record | coxp |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | AAI-100 |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N715CK |
| NTSB Number | NYC08IA290 |
| Missing Aircraft Indicator | -- |
| Federal Aviation Reg. Part | Part 121: Air Carrier |
| Type of Flight Plan filed | IFR |
| Flight plan Was Activated? | Yes |
| Damage | None |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | BOEING |
| Aircraft Model | 747-209B |
| Aircraft Series Identifier | -- |
| Aircraft Serial Number | 22447 |
| Certified Max Gross Weight | 679845 |
| Aircraft Category | Airplane |
| Aircraft Registration Class | -- |
| Aircraft is a homebuilt? | No |
| Flight Crew Seats | 3 |
| Cabin Crew Seats | 2 |
| Passenger Seats | 3 |
| Total number of seats on the aircraft | 8 |
| Number of Engines | 4 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Continuous Airworthiness |
| Date of Last Inspection | -- |
| Airframe hours since last inspection | -- |
| Airframe Hours | 87617 |
| ELT Installed | Yes |
| ELT Activated | No |
| ELT Aided Location of Event Site | No |
| ELT Type | Unknown |
| Aircraft Owner Name | Kalitta Air |
| Aircraft Owner Street Address | 818 Willow Run Airport |
| Aircraft Owner City | Ypsilanti |
| Aircraft Owner State | MI |
| Aircraft Owner Country | USA |
| Aircraft Owner Zipcode | 48198 |
| Operator is an individual? | No |
| Operator Name | KALITTA FLYING SERVICE INC |
| Operator Same as Owner? | No |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | No |
| Operator Street Address | 818 Willow Run Airport |
| Operator City | Ypsilanti |
| Operator State | MI |
| Operator Country | USA |
| Operator Zip code | 48198 |
| Operator Code | KCSA |
| Owner has at least one certificate | Yes - certificate holder |
| Other Operator of large aircraft? | No |
| Certified for Part 133 or 137 Operation | -- |
| Operator Certificate Number | -- |
| Indicates whether an air carrier operation was scheduled or not | Non-scheduled |
| Indicates Domestic or International Flight | International |
| Operator carrying Pax/Cargo/Mail | Cargo |
| Type of Flying (Per_Bus / Primary) | -- |
| Second Pilot on Board | Yes |
| Departure Point Same as Event | Yes |
| Departure Airport Code | SKBO |
| Departure City | Bogota |
| Departure State | -- |
| Departure Country | CO |
| Departure Time | 337 |
| Departure Time Zone | -- |
| Destination Same as Local Flt | -- |
| Destination Airport Code | KMIA |
| Destination City | Miami |
| Destination State | FL |
| Destination Country | USA |
| Specific Phase of Flight | Takeoff - initial climb |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Oct 29 2010 3:44PM |
| User who most recently changed record | kenj |
| Since inspection or accident | Time of Accident |
| Event Location Runway Number and Location | 31L |
| Runway Length | 12467 |
| Runway Width | 148 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |