tag:blogger.com,1999:blog-3991004594884305625.post4474937496663346796..comments2023-11-28T23:42:25.873-08:00Comments on Satcom Guru: 737 AoA and RedundancyPeter Lemmehttp://www.blogger.com/profile/16409315777756590084noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-3991004594884305625.post-21566857801758615032020-03-10T01:23:58.869-07:002020-03-10T01:23:58.869-07:00Maybe it's time to stop using mechanical, Vane...Maybe it's time to stop using mechanical, Vane Type, AoA sensors. Textron currently equips the Beech and Cessna line with leading edge AoA sensors, which still require heat but have no moving parts. There are also the type that use differential pressure on a pitot probe. I think the industry needs to evaluate the high failure rate of the vane type mechanical probe. I would like to see an analysis of the failure rates and reliability, pros vs cons. of the different types. The existing failure rate should be part of the calculation of having a safe system and I see this a a key place where improvement needs to be made.Tomhttps://www.blogger.com/profile/06629442792026076603noreply@blogger.comtag:blogger.com,1999:blog-3991004594884305625.post-38733900260219325312020-01-15T23:12:55.216-08:002020-01-15T23:12:55.216-08:00I think this is an excellent summary also. I belie...I think this is an excellent summary also. I believe it would be propitious if Boeing would examine methods of enhanced detection and isolation of angle of attack sensor faults as mentioned in the included reference and many other references. Some of these include angle of attack models as in the simulator. They likely would not be used in this case but could be used in the future. Boeing has apparently decided to keep the 737MAX8 with about 4500 orders. That means it will be around for a long time. All the attention has been on the sensor. I question that suppose one had a perfect sensor and well-designed system then would the design flaw in the airframe be corrected? It seems to me that Boeing has constructed an airframe whose aerodynamics is not well known and is difficult to predict. I hope the engine position does not require a redesign. If the CG is actually moved forward significantly it would degrade the ride qualities. It seems that without much doubt the A320NEO is the better airplane.John Knoxhttps://www.blogger.com/profile/01245197484894567413noreply@blogger.comtag:blogger.com,1999:blog-3991004594884305625.post-89979666676682059512019-10-06T09:15:56.961-07:002019-10-06T09:15:56.961-07:00Are the data flight recorder tracings input direct...Are the data flight recorder tracings input directly from the AOA vane, or are they fed from the flight control computer? I'm just trying to isolate where the bad data is originating from. Thank you, RichardAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-3991004594884305625.post-89566327258021496512019-09-25T14:03:21.599-07:002019-09-25T14:03:21.599-07:00Why not use an Accelerometer and/or gyro system to...Why not use an Accelerometer and/or gyro system to verify AOA sensor values? <br />Using multiple AOA sensors, you are still prone to common malfunctions, such as icing etc. <br />Using an independent means of pitch sensing would negate the common malfunctions? Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-3991004594884305625.post-75690250285567353012019-09-24T02:30:30.303-07:002019-09-24T02:30:30.303-07:00Bingo! Thanks for the excellent summary. Pilots ar...Bingo! Thanks for the excellent summary. Pilots are Kings, coders keep them in power.alex englishhttps://www.blogger.com/profile/15986933203387666329noreply@blogger.com