"We haven't seen a technical slip or gaffe in terms of the fundamental design and certification," Muilenburg said. This will do nothing to change the fact that the engines of the 737 Max are in the wrong place.

"Single sources of data are considered acceptable in such cases by our industry," the Boeing spokesperson said. DRAFT NOT FOR DISTRIBUTION 1/19/2020 Figure 4. They should reduce the odds of a Boeing 737 Max crashing from an extreme nose dive. A preliminary report by Ethiopian government officials suggests that a malfunctioning AOA sensor on Ethiopian Airlines flight 302 in March fed erroneous data to the MCAS, which repeatedly forced the nose of the plane down as pilots struggled in vain to regain control. Angle of Attack AoA sensor and The Pitot tubes on side of the cockpit. Your password has been successfully updated. Another angle-of-attack sensor was replaced. From what I gather, it's not an electronic failure, but more of a physical/mechanical/movement error from bird 'gunk' or physical damage failure to the AOA from docking and gate departures. The benefit of the A320 Neo is that the engine was properly placed on the plane to avoid excessive nose lift. Nor has Boeing ever released the complete analysis their engineers must have conducted when they first decided that one sensor was safer than two sensors. We didn't recognize that password reset code. This site uses Akismet to reduce spam. As a member of the electronics design community, I am angry and disappointed with the recent deaths of 346 people due to the Boeing MAX 8 design. Third, some circumstances such as icing and strong winds can affect. @BillWM—Nowadays, due to budget constraints, NASA is working with private contractors like SpaceX, Blue Origin, and more. The answer appears to be that Boeing concluded that the additional light would confuse pilots more than it would help them. Order Now! While there are two AOA sensors on all Boeing 737 Max planes (and have been ever since the first test flights in the spring of 2016), only one of these sensors is actively connected to MCAS – the sensor on the pilot side of the plane. Following the Ethiopian Airlines crash, the family of an American woman who died. The Radiant Angle of Attack Sensor & Display System includes weather vane, sensor, LCD RADIANT color Display, aural output when graph is red zone. But what we can know is that these Boeing engineers were not idiots. The Boeing 737-800 landed safely. Embraer SA EMB-170, rendering unreliable airspeed and altitude readings on the … Safe Flight Instrument Corp. has a number of AOA solutions—see them here. In total, 346 people died in the two accidents. Seems worth researching — The FAA/CAA/NTSB human factors analysis that these are recoverable faults must be missing something —, @BillWM—-Interesting—I will look into this when I get a chance, The one issue with the MEMS sensor that comes to mind is for a wing like an airliner wing with all the lift augmentation surfaces deployed in the high lift mode the required acuracy for the AOA sensor aproaches 0.1 Deg or less. {* optAgree *} Since the initial crash last October, Boeing has been updating the MCAS software on the 737 Max to use data from the plane's two AOA sensors, rather than relying on one sensor. How could an FMECA been allowed to pass muster with a single sensor!

5 Development of Alpha Sensor for Unmanned Aerial Systems Mi-Hyun Park, Sung-Su … Why can't the FAA work with private contractors for something like this? In some cases, faulty sensors led to stall warnings, forcing pilots to abort takeoffs or perform emergency landings.

4 Not just the 737: Angle of Attack Sensors have had problems. I just think we need to be more innovative in our design approach to ruggedize the sensor by minimalizing mechanical aspects of the product where we can. Login to post a comment. "That's important because Boeing made the decision to rely on them as single sources for streams of data.". We've sent you an email with instructions to create a new password. Already have an account? But I was unable to find a clear explanation of what those design problems were. Sign In. During the month of September, the relaunch price is 50% off the original price of $699.95. I can’t find one that is in production. Adding another sensor is ignoring the real problem – just as changing MCAS from 2.5 degrees to 1.5 degrees (or whatever) is ignoring the real problem. A former Boeing pilot who tested the 737 Max, who requested anonymity due to fears of negative repercussions, told CNN "I don't think we appreciated the ramifications of a... failure of an AOA probe.". While not an expert in reliability engineering, I have had some training in it as you most likely have had. An angle of attack limiter or an "alpha" limiter is a flight computer that automatically prevents pilot input from causing the plane to rise over the stall angle. CNN has found that Boeing relied on single sensor for 737 Max that had been flagged 216 times to FAA. "I would be very curious to know what their logic was on that...and what drove them to think that was a suitable solution," said the pilot, who also spoke on the condition of anonymity. Rather we need planes that are designed to be stable so that AOA sensors are activated less often. AOA Sensors have to have part of the sensor out in the elements — This means they are subject to bird strikes(the Ethiopian case), Paint, Masking Tape, DeIcer, Ice, Hail, runway debris, and other effects — I am pretty sure that RTCA DO-160 does not address bird strikes, debris, de-icer, and hail — This leaves these into the TSO for the sensor which is RTCA/FAA/CAA/ICAO  — The real key is having the complete and correct requirements for the AOA sensor design team. We have sent a confirmation email to {* emailAddressData *}. Help us spread the word by sharing this page with your friends: One of the primary changes being made by Boeing is to link two Angle of Attack sensors to MCAS. Aircraft Spruce supplies components for a wide variety of homebuilt aircraft and discount pilot supplies. Why is it that we have developed an amazing MEMS technology that is rugged as well as improving so many innovative electronic systems (See Reference 5 and my comments below)? Sorry, we could not verify that email address. Of course, having two AOA’s, one on each side of the aircraft for redundancy and comparison, is a good solution. Learn how your comment data is processed.

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