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          Re: trim runaway. With the MAC trim system used on the LNC2
the only way to get trim runaway is for the switch to fail. By the time
one realizes what has happened and pulls the breaker the aircraft will
be out of trim, perhaps badly so. The question then is the one raised by
Rob Wolf: --   Can control be maintained in a 320/360 with full nose-up
or nose-down trim?
           If not, then the problem is not only to stop the runaway, but
also to correct it. How about using two trim switches, one a top hat on
the stick, the other the conventional MAC rocker switch and use a DPDT
selector switch to select the active trim mode. If the active switch
fails, it would be a simple matter to deselect it and select the other,
allowing the out of trim situation to be corrected.
          But how serious is this problem? Has anyone ever had a MAC
system run away?
                                                         Charles Keller



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