Originally Posted by
Goldenrivett
If both (all) engines have failed then there is probably a common reason - such as fuel starvation (e.g. no booster pumps?), volcanic ash? icing? etc. so until you are back in the relight envelope and away from the ash, ice etc. (or below the gravity fuel feed ceiling if no booster pumps) then relight attempts will be futile - so you may as well crack on with the more important stuff.
If the inference is that it is vertually impossible to relight engines from a dual engine failure at altitude - say FL390, then why the rush (second line item) to attain optimum relight speed 300kts? Surely better managemnt would be to acheive the best drift down speed, gaining posibly precious miles, until approaching/below FL250 - as stated on Pg 2 of the checklist, when a windmilling relight would be possible - or aactually. keep the optimum drift down speed rather than 300kts between FL250 and FL200, and go for a starter assisted attempt at FL200.