Individually Owned: 150,657
Corporate Owned: 137,281
Anchorage Airport
Aircraft Accident/Incident Report
Anchorage, Alaska 99515
Saturday, September 25, 1993 8:35 AKD
NTSB Narrative Summary Released at Completion of Accident
A 28 OUNCE DUCK WAS INGESTED INTO A JT9 TURBOFAN ENGINE OF A B747 ON TAKEOFF, IMPACTING AND BREAKING THE 10 PLY FIBERGLASS FAN SPINNER. DOWNSTREAM ENGINE DESTRUCTION FOLLOWED. ENGINE MANUFACTURE AND FAA WAS AWARE OF A NUMBER OF PREVIOUS BIRD-STRIKE FAILURES WITH THIS SPINNER. NEW AND STRONGER 20 PLY SPINNERS ARE BEING PHASED IN; HOWEVER, THIN SPINNERS ARE STILL IN USE ON JT9 ENGINES IN COMMERCIAL SERVICE.
NTSB Probable Cause Narrative
FOREIGN OBJECT DAMAGE TO THE COMPRESSOR FORWARD FAN ASSEMBLY AS A RESULT OF THE INGESTION OF A BIRD.
Event Information
| Type of Event | Incident |
| Event Date | 9/25/1993 |
| Event Day of the Week | Saturday |
| Time of Event | 835 |
| Event Time Zone | -- |
| Event City | ANCHORAGE |
| Event State | ALASKA |
| Event Country | -- |
| Zipcode of the event site | 99515 |
| Event Date Year | 1993 |
| Event Date Month | 9 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | |
| Event Location Longitude | |
| Event Location Airport | ANCHORAGE |
| Event Location Nearest Airport ID | ANC |
| Indicates whether the acc/inc occurred off or on an airport | On Airport |
| Distance from airport in statute miles | 1 |
| Degrees magnetic from airport | 240 |
| Airport Elevation | 144 |
| Weather Briefing Completeness | Not pertinent |
| Investigator's weather source | Unknown |
| Time of the weather observation | 845 |
| 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 | 6000 |
| Lowest Non-Ceiling Height | 0 |
| Sky/Lowest/Cloud Conditions | Unknown |
| Sky Condition for Lowest Ceiling | Overcast |
| Visibility Runway Visual Range (Feet) | 0 |
| Visibility Runway Visual Value (Statute Miles) | 0 |
| Visibility (Statute Miles) | 15 |
| Air Temperature at event time (in degrees celsius) | 7 |
| Dew Point at event time (in degress fahrenheit) | -- |
| Wind Direction (degrees magnetic) | 340 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 10 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | 0 |
| Altimeter Setting at event time (in. Hg) | -- |
| 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 | 3 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 5068 |
| NTSB Notification Source | -- |
| NTSB Notification Date | Sep 25 1993 12:00AM |
| NTSB Notification Time | 845 |
| Fiche Number and/or location -used to find docket information | IMAGE |
| Date of most recent change to record | Dec 11 2000 1:37PM |
| User who most recently changed record | dbo |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N629US |
| NTSB Number | ANC93IA188 |
| 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 | BOEING |
| Aircraft Model | 747-200 |
| Aircraft Series Identifier | 747-200 |
| Aircraft Serial Number | |
| Certified Max Gross Weight | 750000 |
| 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 | 286 |
| Number of Engines | 4 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Continuous Airworthiness |
| Date of Last Inspection | Sep 24 1993 12:00AM |
| Airframe hours since last inspection | 6 |
| Airframe Hours | -- |
| ELT Installed | Yes |
| ELT Activated | No |
| ELT Aided Location of Event Site | Unknown |
| ELT Type | -- |
| Aircraft Owner Name | NORTHWEST AIRLINES, INC |
| Aircraft Owner Street Address | MINNEAPOLIS-STPAUL AIRPORT |
| Aircraft Owner City | ST PAUL |
| Aircraft Owner State | MN |
| Aircraft Owner Country | |
| Aircraft Owner Zipcode | 55121 |
| Operator is an individual? | -- |
| Operator Name | NORTHWEST AIRLINES, INC |
| Operator Same as Owner? | No |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | No |
| Operator Street Address | MINNEAPOLIS-STPAUL AIRPORT |
| Operator City | ST PAUL |
| Operator State | MN |
| Operator Country | |
| Operator Zip code | 55121 |
| Operator Code | NWAA |
| 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 | International |
| Operator carrying Pax/Cargo/Mail | Cargo |
| Type of Flying (Per_Bus / Primary) | Unknown |
| Second Pilot on Board | No |
| Departure Point Same as Event | Yes |
| Departure Airport Code | |
| Departure City | |
| Departure State | |
| Departure Country | |
| Departure Time | 835 |
| Departure Time Zone | ADT |
| Destination Same as Local Flt | -- |
| Destination Airport Code | NRT |
| Destination City | TOKYO, JAPAN |
| Destination State | |
| Destination Country | |
| Specific Phase of Flight | Takeoff |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Jan 2 2001 10:34AM |
| User who most recently changed record | dbo |
| Since inspection or accident | -- |
| Event Location Runway Number and Location | 32 |
| Runway Length | 10496 |
| Runway Width | 150 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |