Individually Owned: 150,657
Corporate Owned: 137,281
Dummy Airport
Aircraft Accident/Incident Report
Brisbane American Samoa
Sunday, December 8, 2002 10:12 EST
NTSB Narrative Summary Released at Completion of Accident
On December 8, 2002, Boeing 767-219ER aircraft, registered ZK-NBC, sustained a failure of the number-1 (left) engine during a scheduled regular passenger transport flight from Brisbane to Auckland. The flight crew reported a loud 'bang' and felt the aircraft move to the right, followed by a progressive yaw to the left. The crew shut down the left engine, a GE CF6-80A and completed checklist items before returning the aircraft to Brisbane. An initial engineering evaluation of the left engine revealed the loss of the outboard fan cowl section and a large rupture of the outboard core cowl, with associated damage to the engine strut and wing leading edge flap above that area. The engine core showed the complete circumferential disruption of the high-pressure turbine casing and the loss of a large segment of the first-stage high-pressure turbine disk. The low speed (N1) spool shaft had fractured between the first and second-stage turbine disks.
Failure of the number-1 (left) engine from ZK-NBC occurred as a direct result of the rupture of the first-stage high-pressure turbine disk, liberating a large disk section that was uncontained by the engine casing or nacelle. Disk fracture had initiated from prior fatigue cracking at the base of a turbine blade fir tree slot. Fatigue cracking had initiated from the rear corner of that blade slot and propagated radially inward and axially forward, before turning to intersect an adjacent rim-bolt hole. At that stage, the crack was below critical size and incapable of directly causing the disk rupture. Subsequently, the growth of a secondary radial-axial crack from the base of the primary crack enlarged the total defect to a depth of 39 mm, where it reached critical size and initiated the overload failure of the remaining section, with the release of the disk fragment.
The investigation is under the jurisdiction of the government of Australia. Further information pertaining to this accident may be obtained from:
Australian Transport Safety Bureau (ATSB)
P.O. Box 967, Civic Square
Canberra A.C.T. 2608
Australia
Tel.: (61) 2 6274-6464
(61) 2 6257-4150
E-mail: atsbinfo@atsb.gov.au
Fax: (61) 2 6274-6474
AFTN: ASCOYLYX
Website: http://www.atsb.gov.au
This report is for informational purposes only and contains only information obtained for, or released by, the Government of Australia
NTSB Probable Cause Narrative
Not Yet Reported
Event Information
| Type of Event | Incident |
| Event Date | 12/8/2002 |
| Event Day of the Week | Sunday |
| Time of Event | 1012 |
| Event Time Zone | Eastern Standard Time |
| Event City | Brisbane |
| Event State | -- |
| Event Country | AMERICAN SAMOA |
| Zipcode of the event site | -- |
| Event Date Year | 2002 |
| Event Date Month | 12 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | -- |
| Event Location Longitude | -- |
| Event Location Airport | Dummy |
| Event Location Nearest Airport ID | ABBN |
| Indicates whether the acc/inc occurred off or on an airport | -- |
| Distance from airport in statute miles | -- |
| Degrees magnetic from airport | -- |
| Airport Elevation | -- |
| Weather Briefing Completeness | -- |
| Investigator's weather source | -- |
| Time of the weather observation | |
| Direction of event from weather observation facility (degrees) | -- |
| Weather Observation Facility ID | -- |
| Elevation of weather observation facility | -- |
| Distance of event from weather observation facility (units?) | -- |
| Time Zone of the weather observation | -- |
| Lighting Conditions | -- |
| Lowest Ceiling Height | -- |
| Lowest Non-Ceiling Height | -- |
| Sky/Lowest/Cloud Conditions | -- |
| Sky Condition for Lowest Ceiling | -- |
| Visibility Runway Visual Range (Feet) | -- |
| Visibility Runway Visual Value (Statute Miles) | -- |
| Visibility (Statute Miles) | -- |
| Air Temperature at event time (in degrees celsius) | -- |
| Dew Point at event time (in degress fahrenheit) | -- |
| Wind Direction (degrees magnetic) | -- |
| Variable Wind Indicator | -- |
| Wind Speed (knots) | -- |
| Wind Velocity Indicator | -- |
| Wind Gust Indicator | -- |
| Wind Gust (knots) | -- |
| Altimeter Setting at event time (in. Hg) | -- |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | -- |
| METAR weather report | -- |
| Event Highest Injury | -- |
| On Ground, Fatal Injuries | -- |
| On Ground, Minor Injuries | -- |
| On Ground, Serious Injuries | -- |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | -- |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | Foreign |
| NTSB Docket Number (internal use) | -- |
| NTSB Notification Source | |
| NTSB Notification Date | -- |
| NTSB Notification Time | -- |
| Fiche Number and/or location -used to find docket information | -- |
| Date of most recent change to record | Apr 25 2008 12:23PM |
| User who most recently changed record | defc |
| Basic weather conditions | -- |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | -- |
| NTSB Number | ENG03WA004 |
| Missing Aircraft Indicator | -- |
| Federal Aviation Reg. Part | Non-U.S., Commercial |
| Type of Flight Plan filed | IFR |
| Flight plan Was Activated? | Yes |
| Damage | Minor |
| Aircraft Fire | -- |
| Aircraft Explosion | -- |
| Aircraft Manufacturer's Full Name | Boeing |
| Aircraft Model | 767-219ER |
| Aircraft Series Identifier | -- |
| Aircraft Serial Number | -- |
| Certified Max Gross Weight | -- |
| Aircraft Category | Airplane |
| Aircraft Registration Class | -- |
| Aircraft is a homebuilt? | No |
| Flight Crew Seats | -- |
| Cabin Crew Seats | -- |
| Passenger Seats | -- |
| Total number of seats on the aircraft | -- |
| Number of Engines | -- |
| Fixed gear or retractable gear | Fixed |
| Aircraft, Type of Last Inspection | -- |
| Date of Last Inspection | -- |
| Airframe hours since last inspection | -- |
| Airframe Hours | -- |
| ELT Installed | -- |
| ELT Activated | -- |
| ELT Aided Location of Event Site | -- |
| ELT Type | -- |
| Aircraft Owner Name | -- |
| Aircraft Owner Street Address | -- |
| Aircraft Owner City | -- |
| Aircraft Owner State | -- |
| Aircraft Owner Country | -- |
| Aircraft Owner Zipcode | -- |
| Operator is an individual? | -- |
| Operator Name | -- |
| Operator Same as Owner? | -- |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | -- |
| Operator Street Address | -- |
| Operator City | -- |
| Operator State | -- |
| Operator Country | NZ |
| Operator Zip code | -- |
| Operator Code | ANZY |
| Owner has at least one certificate | None |
| 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 | -- |
| Departure Point Same as Event | Yes |
| Departure Airport Code | ABBN |
| Departure City | BRISBANE |
| Departure State | -- |
| Departure Country | AS |
| Departure Time | -- |
| Departure Time Zone | EST |
| Destination Same as Local Flt | -- |
| Destination Airport Code | NZAA |
| Destination City | AUCKLAND |
| Destination State | -- |
| Destination Country | NZ |
| Specific Phase of Flight | Climb - to cruise |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Apr 25 2008 12:23PM |
| User who most recently changed record | defc |
| Since inspection or accident | -- |
| Event Location Runway Number and Location | -- |
| Runway Length | -- |
| Runway Width | -- |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |