Phuket Airlines B743 at Jeddah on Jul 4th 2008, uncontained engine failure during takeoff

Last Update: December 20, 2012 / 11:51:35 GMT/Zulu time

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Incident Facts

Date of incident
Jul 4, 2008

Classification
Incident

Aircraft Type
Boeing 747-300

ICAO Type Designator
B743

On Dec 20th 2012 the NTSB released their final report concluding the probable cause of the incident was:

Failure of the low pressure turbine stage 3 disk due to a design that is vulnerable to high pressure turbine unbalance-induced synchronous vibration that cannot be detected in flight, and the subsequent uncontained engine failure.

The NTSB rated the occurrence an uncontained engine failure. A borescopic inspection had found localized airfoil damage sufficient to create a high pressure turbine (HPT) rotor imbalance. The vibrations created by the HPT rotor interacted with the low pressure turbine (LPT) rotor via a common bearing support and "excited a bladed-disk mode response in the LPT S3 disk". As result the LPT disk experienced resonant alternating stress exceeding the material endurance limits and high cycle/high amplitude fatigue cracks developed along the low pressure turbine as well as the engine case. The cracks grew together to a circumferential crack resulting in the separation of the disk, which penetrated the engine case releasing high energy debris as fragments of the disk and the LPT stage 3 nozzles were liberated.

4 safety recommendations, one of them urgent, were released as result of the investigation.
Incident Facts

Date of incident
Jul 4, 2008

Classification
Incident

Aircraft Type
Boeing 747-300

ICAO Type Designator
B743

This article is published under license from Avherald.com. © of text by Avherald.com.
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