Reply to post: Re: Automatic trim adjustment does not push down the nose aggressively

UK joins growing list of territories to ban Boeing 737 Max flights as firm says patch incoming

Alister Silver badge

Re: Automatic trim adjustment does not push down the nose aggressively

the pitch axis (a sudden pitch downward in climb out is what happened in both crashes) seems to be what the software system was designed to compensate for in the MAX versions of the 737.

The MCAS is designed to induce a pitch down to counteract the fact that the engine nacelles are lower, longer, and further forward on the 737 MAX and therefore can cause a pitch up in certain conditions.

The MCAS rotates the whole stabiliser to achieve this, and can therefore induce sufficient downward moment that the elevators cannot compensate for it even with full upward deflection.

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