Precursors - continued

GEAE experienced a similar engine failure during test cell operation of a highly instrumented CF6 engine (engineering test) on January 12, 1973.

This failure was initiated by the rubbing between the fan rotor and casing and resulted in damage similar to the other occurrences.

This was a precursor because the same failure mode as the National Airlines event and the American Airlines event was experienced and the risk for a repeat event to a revenue service engine was not recognized. This engine was instrumented and was undergoing engineering tests in part as a result of the previous American Airlines test cell failure.

Now let's take a look at the regulatory guidance and other changes that were made after the National Airlines Flight 27 accident. Select Next to continue.