Old 29th Dec 2018, 20:22
  #46 (permalink)  
infrequentflyer789
 
Join Date: Jan 2008
Location: uk
Posts: 767
Originally Posted by DaveReidUK View Post
Are you sure about that ?

I haven't seen any FDR traces for the two flights where problems were reported that occurred prior to the AoA sensor replacement. Nor AFAIK has there been any report on the condition of the removed sensor.
No FDR but Maint log in prelim report shows the following AOA errors before sensor replacement:

AOA SIGNAL FAIL (34-21023)
34-21107 (AIR DATA SIGNAL INVALID)
34-21123 (AOA SIGNAL OUT OF RANGE)

We also know the problems were intermittent because I think it's already been shown in these threads that there was at least one uneventful sector in between.

IMHO it's entirely possible that neither sensor was faulty and both were correctly installed, i.e. the fault was farther downstream and replacing the sensor made no difference.
Agree - I think far more likely one fault elsewhere than two faulty sensors. However, replacing the sensor did make a difference: an intermittent signal corruption / loss changed into a constant signal corruption...
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