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Rob said, But the logical step from the nuisance "it doesn't move when I want
it to" to the hazardous "it moves when I don't want it to" isn't quite so
logical. Failing one way just isn't as likely as failing the other
way
It may be true that electrical runaway is less likely than "doesn't move
when I want it to" but I argue the effect can be similar.
case 1: copilot jams pitch trim down and the
button gets mechanically stuck so you can't command pitch trim up. (yes I
thought it was a stretch to until one of my buttons got stuck down)
case 2: auto-pilot/auto-trim drives to max trim and
the auto-trim relay box doesn't revert all the way to manual trim. (if you
doubt this one look at the tru-trak schematic. basically there's a relay
normally closed spring between you and loss of manual trim).
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