7 days ago
It's About @Boeing 737 MAX again 😁
The Boeing 737 MAX comes with a software called MCAS (Maneuvering Characteristics Augmentation System). It is a longitudinal stability enhancement software that is designed to counteract non-liner lift produced by the aircraft engines nacelle. MCAS is not a stall prevention software.
Boeing 737MAX has two Large LEAP-1B (68″ diameter) engines attached slightly up and forward, than the CFM56-7 (61″ diameter) engines on its predecessor 737 NG.
Larger diameter nacelle and its location on the aircraft generate vortex flow and produces non-linear lift at high Angle of Attack (AoA)
As the AoA increases during takeoff and climb, this non-linear lift causes a slight pitch-up effect because the engines nacelle are in front of aircraft’s centre of gravity.
The Pitch up effect due to non-linear lift reduces stick force, and that makes the pilot to exert more back pressure on the yoke, leading the aircraft towards stall. ( Note This is not allowed under FAR §25.173 “Static longitudinal stability”.) MCAS software senses this condition, through one of the two AoA sensors called “Alpha Vane” located either side of the fuselage.
Then it directs the horizontal stabiliser trim to move the aircraft to nose down position. Once the MCAS senses AoA falls below the stable threshold it will command the stabilizer trim to return the aircraft back to state before MCAS was activated.
MCAS activates without pilot’s command and only operates on manual and flaps up flight.
If the sensor or software is at fault, then the aircraft has a chance of crash.
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