Pilot ejects an instant before fighterjet crashes

[Thunderitter]

the papers said that a hammering noise was heard at the moment the pilot powered up....it will be a while before a determination is made ..... i'm guessing engine failure,but what particular assembly failed????.....hopefully the investigators have enough left to work with ......

They'll be doing well to get info info out of that one to determine the exact cause apart from 'engine' failure. No FDRs on these babies. They may get info via finding a broken part and you can usually tell whether it was broken pre-crash or not.

Usually popping or hammering is on the account of a compressor stall, which then causes an uneven airflow through the engine - a bit like a back fire in a car. Various things can 'cause a compressor stall, most commonly a foreign object, but a high angle pass will put an additional load on a compressor so if there's a faulty blade in there, then that could let go.

 

[Jim Campbell]

They'll be doing well to get info info out of that one to determine the exact cause apart from 'engine' failure. No FDRs on these babies. They may get info via finding a broken part and you can usually tell whether it was broken pre-crash or not.

Usually popping or hammering is on the account of a compressor stall, which then causes an uneven airflow through the engine - a bit like a back fire in a car. Various things can 'cause a compressor stall, most commonly a foreign object, but a high angle pass will put an additional load on a compressor so if there's a faulty blade in there, then that could let go.

i'm thinking metal fatigue looks like a reasonable direction to explore.....