Event Details

Title:Uncontained Engine Failure, Aircraft Incident Report, Japan Airlines Flight JL726, B747-300 JA8178, Tangerang, West Java, Indonesia, 5 September 2000
Micro summary:This Boeing 747-300 experienced an uncontained engine failure shortly after takeoff.
Event Time:2000-09-05 at 1639 UTC
File Name:2000-09-05-ID.pdf
Publishing Agency:National Transportation Safety Committee (NTSC)
Publishing Country:Indonesia
Report number:KNKT/00.06/01.01.004
Site of event:Soekarno-Hatta International Airport, Jakarta,
Departure:Soekarno-Hatta International Airport, Jakarta, Indonesia
Destination:New Tokyo International Airport, Tokyo, Japan
Airplane Type(s):Boeing 747-300
Flight Phase:Climb
Operator(s):Japan Airlines
Type of flight:Revenue
Serious Injuries:0
Other Injuries:0
Executive Summary:On September 5, 2000, a Boeing B747-300 of Japan Airlines (JAL) registration JA8178 was operating on a scheduled international passenger flight, with flight number JL726. The aircraft, which departed from Soekarno-Hatta International Airport, Jakarta, experienced a serious incident shortly after take-off at 23:39 LT (Local Time) or 16:39 UTC, in which the No 1 engine’s fifth low pressure turbine (LPT) disk failed, ejecting debris damaging the airframe structure and several houses in a village.

There were a total of 377 persons on board including a crew of three and 14 cabin attendants. No persons on board or on the ground were injured.

The engine was shut down, and after dumping 163,000 lbs. of fuel the aircraft returned to Soekarno-Hatta Airport and safely landed at Soekarno-Hatta airport at 17:36 hrs UTC.

The National Transportation Safety Board conducted the incident investigation according to the standards and recommended practices of the Annex 13 to the Convention on International Civil Aviation. All the investigation activities in Japan and the United States were conducted under the supervision of NTSC, Indonesia, the JCAB, Japan, and the NTSB, USA.

Preliminary inspection of the failed disk by visual and binocular microscope technique was done at the Institut Teknologi Bandung. The fractured disk was subsequently examined at the National Transportation Safety Board laboratory in Washington DC, using microscope, XRD and SEM techniques. Additional examinations were also conducted by Pratt & Whitney, East Hartford, Connecticut USA, using microscope, SEM, creep tests and elevated temperature fatigue tests.

The CVR and FDR readouts were performed in the Japan Aircraft Accident Investigation Commission laboratory at Haneda, Japan, while the engine teardown was performed at the JAL Maintenance Facility at Narita.

The findings of the examinations revealed that the failure of the disk was attributed to intergranular, elevated temperature fatigue, which had progressed from the surface of the web. The fracture originated in a blended repaired area on the front surface of the disk. The investigation concluded that blending operation, in particular on a disk or on a highly stressed part carries a high risk of residual damage (worked material or shallow cracks) remaining and these sites are potential sites for fatigue crack initiation. Therefore, the

NTSC recommended that;

1. Residual damage seems to be the origin of the fatigue crack on this disk. Such damage could not be detected by available NDI method. To prevent similar occurrence, blending operation on such a particular disk should be reviewed.

2. A disk design review should be undertaken.
Learning Keywords:Operations - Maintenance
Systems - Engine - Uncontained Engine Failure
Consequence - Damage - Airframe or fuselage
Close match:Uncontained engine failure, Aircraft Accident Report, Garuda Indonesia Flight GA 880, Boeing B747-200 PK-GSD, In flight (21 minutes after takeoff from Denpasar, Bali), 23 November 2001
Uncontained engine failure, Northwest Airlines, Inc., Boeing 747-151, N607US, Honolulu, Hawaii, May 13, 1971
Engine failure, National Airlines, Inc., McDonnell-Douglas DC-10-10, N60NA, Near Tampa, Florida, July 8, 1974
Uncontained engine failure, Eastern Airlines Flight 935 Lockheed L-1011-385, N309EA Near Colts Neck, New Jersey September 22, 1981
Uncontained engine failure, McDonnell Douglas MD-83, June 17, 1997
Uncontained engine failure, Douglas DC-9-32, March 18, 1997
Uncontained engine failure, McDonnell Douglas MD-82, November 23, 1996
Uncontained engine failure, Douglas DC-9-32, May 5, 1994
Uncontained engine failure, Boeing 727-224, October 7, 1998
Uncontained engine failure, Boeing 737-200, April 28, 1997
Uncontained engine failure, Boeing 707-341, N107BV, August 2, 1993
Uncontained engine failure, Boeing 747-240, AP-BAK, December 6, 1995


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