Accident Summary - continued

It was generally agreed that two conditions had to be present for a massive engine failure such as this to result:

1. A coincident and coupled fan case wave and blade "rocking" wave mode, and
2. Fan blade tip rub.

The Campbell diagram to the right illustrates the fan case and blade vibratory modes. Note this diagram is for illustrative purposes only; it is not to scale.

Select Next to continue.