NG Engine start restrictions
 

Hi

Please can someone advise what is Extended Engine Motoring? Why is it different from the normal starter duty cycle?

Many thanks

Pin

It is a longer than normal start cycle motoring limit.

The only difference is that it is longer and requires a longer cooling period between cycles.

ok, when would it be used? i ve never heard of it. Is it an engineering function?

High altitude airport engine starting.

Pin Head,


Extended engine motoring is used for several functions e.g.


1... cooling engine and lowering egt after a hot or hung start before restart attempt.


2... maintenance motorimg for leak checking various systems e.g. after a fuel,oil or hydraulic filter or component change etc etc.


McHale. :)

And ensuring EGT margin during (by maximising N2 as well as N1) during tailwind starts!