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Is the 737 Max aerodynamically unstable?
“The root of the problem is that the Boeing 737 MAX aircraft will remain aerodynamically unstable. It will still have a tendency for the nose to pitch during certain manoeuvres and in turn this could still lead to an increased risk of its engines stalling.
Why does 737 max pitch up?
The 737 MAX’s larger CFM LEAP-1B engines are fitted farther forward and higher up than in previous models. The aerodynamic effect of its nacelles contributes to the aircraft’s tendency to pitch up at high angles of attack (AOA).
What is the Boeing 737 MAX maneuvering characteristics augmentation system?
Boeing’s Maneuvering Characteristics Augmentation System, known as MCAS, will now rely on readings from two Angle of Attack (AoA) sensors that measure the angle at which the wing slices through the air, instead of just one.
What did Boeing do to fix the 737 MAX?
Boeing Says F.A.A. Has Approved New Fix for 737 Max. Last November, the Federal Aviation Administration cleared the fleet to fly again provided that Boeing and airlines updated the Max’s flight control software and rerouted some electrical wiring, among other changes.
What makes a 737 MAX move in pitch?
All objects on an aircraft placed ahead of the Center of Gravity (the line in Figure 2, around which the aircraft moves in pitch) will contribute to destabilize the aircraft in pitch. Figure 2. The 737-800 (yellow) overlaid on the 737 MAX 8 (purple), with the line denoting the CG in pitch. Source: Leeham Co. and 737 ACAP.
What are the drawbacks of a 737 MAX?
By placing the nacelle further forward of the wing, it could be placed higher. Combined with a higher nose landing gear, which raises the nacelle further, the same ground clearance could be achieved for the nacelle as for the 737NG. The drawback of a larger nacelle, placed further forward, is it destabilizes the aircraft in pitch.
How does Boeing increase ground clearance on 737 MAX?
Source: Boeing 737 MAX brochure. By placing the nacelle further forward of the wing, it could be placed higher. Combined with a higher nose landing gear, which raises the nacelle further, the same ground clearance could be achieved for the nacelle as for the 737NG.
What is automatic trim on Boeing 737 MAX?
The background to Boeing’s 737 MAX automatic trim. The automatic trim we described last week has a name, MCAS, or Maneuvering Characteristics Automation System. It’s unique to the MAX because the 737 MAX no longer has the docile pitch characteristics of the 737NG at high Angles Of Attack (AOA).