""No double engine changes for crying out loud. For one, it's an SMS issue. Do you really want BOTH engines being replaced on a two-engine aircraft? Never do the same maintenance to both engines at the same time. If, for some reason you MUST do the same mx to both sides, the same person absolutely cannot perform the mx on both sides. In order to reduce the risk of the same mistake being made to both engines and a resulting dual flameout. Basic ETOPs SMS.""
Absolutely,thats been procedure since time began.