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Old 14th Jun 2019, 21:13
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zonoma
 
Join Date: Mar 2001
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Eco Climbing

Hi all, ATCO here so please be gentle. My employer has recently alerted us that several B787 operators will be flying their aircraft in a different mode so we can expect them to climb at a lower rate than usual. We get that, but today one particular aircraft operating as such was climbing at 500ft/min but pushing out 348kts IAS. We are told that the new profiles are to "protect the engines" and the question was asked - if say the new model sets aircraft thrust at 78%, why climb at 500ft/min with 348kts IAS, why not climb at 1000ft/min at 315kts (or whatever the slower speed would be). We think it is simply "set thrust level ie 78%, trade off speed for climb rate" and the engines are still protected. Can someone please try and educate me in simple terms what we as controllers are missing??! Thanks
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