I've just created a flight SBGR to EGLL in SimBrief and I get a huge variation in cruising altitudes meaning I would have to step climb, then descend quite a few times. Is this normal? I understand how the step climb system works but didn't know aircraft also descend before climbing again (please see attached enroute altitudes).

https://imgur.com/FnDJesL

Many thanks

Hi,

Based on what you have shown, I would check the airway between those waypoints for a FL restriction. Did Simbrief auto-generate that routing or did you enter it manually?

Any significant weather in the Simbrief forecast for that flight plan?

 

It certainly does not seem correct that you would be flying at FL240 then at FL400 then to come down again to FL240 and so on. Seems like a "yo-yo " flight that's not realistic

Regards