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Steve Taranovich

Aircraft: Angle of Attack (A0A) Sensor design

Steve Taranovich
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BillWM
BillWM
5/15/2019 7:00:22 PM
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AOA sensors have to have part of the sensor out in the elements
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.

 

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steve.taranovich
steve.taranovich
5/15/2019 8:42:37 PM
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Re: AOA sensors have to have part of the sensor out in the elements
@BillWM---You're right. DO-160 tests salt, fungus, fluids, sand, dust....not bird strikes or mechanical damage in docking and undocking the aircraft. 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. 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.

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BillWM
BillWM
5/15/2019 8:50:14 PM
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Maybe what would be best is redundant dissimilar AOA sensing methods for each sensor
Maybe what would be best is redundant dissimilar AOA sensing methods for each sensor  -- Perhaps one the Vane and Shaft like there is now, and the other perhaps vector based pressure ports on a fixed metal protrusion or some other non-blade and shaft method.

 

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steve.taranovich
steve.taranovich
5/15/2019 10:50:07 PM
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Re: Maybe what would be best is redundant dissimilar AOA sensing methods for each sensor
@BillWM---that's an idea---we need to have more possibilities discussed like that and then test and choose from there

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emma8374
emma8374
5/17/2019 5:04:43 PM
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Re: Maybe what would be best is redundant dissimilar AOA sensing methods for each sensor
nice work

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BillWM
BillWM
5/19/2019 2:56:21 PM
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Re: Maybe what would be best is redundant dissimilar AOA sensing methods for each sensor
Did some checking and these sensors and the airspeed sensors in the last 20 years are linked to an Airbus A300 incident off of Brazil, an A320 series Aircraft In Europe and the two 737MAX losses.   Seems worth researching -- The FAA/CAA/NTSB human factors analysis that these are recoverable faults must be missing something ---

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steve.taranovich
steve.taranovich
5/19/2019 4:10:57 PM
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Re: Maybe what would be best is redundant dissimilar AOA sensing methods for each sensor
@BillWM----Interesting---I will look into this when I get a chance

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BillWM
BillWM
5/21/2019 3:44:05 PM
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Re: Maybe what would be best is redundant dissimilar AOA sensing methods for each sensor
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.   A smaller lighter plane/UAV appearantly does not require the accuracy (65kts takeoff speed vs 170kts takeoff speed)  -- still seems worth researching but there is not much in the NASA / FAA budgets for aerospace R&D

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steve.taranovich
steve.taranovich
5/21/2019 3:49:10 PM
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Re: Maybe what would be best is redundant dissimilar AOA sensing methods for each sensor
@BillWM---Nowadays, due to budget constraints, NASA is working with private contractors like SpaceX, Blue Origin, and more. Why can't the FAA work with private contractors for something like this?

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BillWM
BillWM
5/21/2019 3:57:26 PM
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Re: Maybe what would be best is redundant dissimilar AOA sensing methods for each sensor
The real issue is in the air transport industry most of the prime and sub contractors have been "leaned out to the point of detonation" and the corporate budgets for R&D reduced -- This is one of those things that would save airlines money in insurance costs over time, but is hard to come up with an FAA grant to a corp, or even university, where in the UK there is about 8 million pounds annually for companies and universites for things like this and similar in the EU.

 

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