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Old 6th Apr 2019, 08:26
  #3412 (permalink)  
Vinnie Boombatz
 
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https://ecfr.io/Title-14/se14.3.121_1344

"§121.344 Digital flight data recorders for transport category airplanes.

(a) . . . The operational parameters required to be recorded by digital flight data recorders required by this section are as follows: . . .

. . . (19) Pitch trim surface position or parameters of paragraph (a)(82) of this section if currently recorded;

. . . (82) Cockpit trim control input position—pitch . . . "

So toss a coin. With help from Boeing and the carrier(s), the investigators should be able to determine the signal source.
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