REFLECTOR: Pitch Trim Mystery

[John Dibble]

Just looked for the relay.  One problem is that when the plane has sat
for a day, the trim works fine.  Both up and down trim show over 12V
across the wires going to the trim motor.  There is a small circuit
board mounted inside the keel just behind the stick and it looks like
some wires from the stick go there.  Also the wires going to the trim
motor are white and all wires from the stick are various non-white
colors and it looks like the white wires come from the circuit board.
Hard to see in there.  Is the circuit board a relay?

John

Ron Brown wrote:

> John, I agree with TEC: If the trim switch is in the control stick, it
> probably has a very low power rating and needs to be actuating
> relays.  If there is a relay, you need to trouble shoot and determine
> if the problem is in the relay or the switch. If your trim switch is
> mounted on the panel (and involves no relays), then the switch needs
> to be replaced. Ronnie
>
>      ----- Original Message -----
>      From: HYTEC45 at aol.com
>      To: reflector at tvbf.org
>      Sent: Thursday, March 23, 2006 11:38 AM
>      Subject: Re: REFLECTOR: Pitch Trim Mystery
>       In a message dated 3/23/2006 8:31:06 A.M. Pacific Standard
>      Time, aminetech at bluefrog.com writes:
>
>           Any suggestions on what
>           to do with the switch?
>
>      Use the switch to operate a relay (DPDT).  The relay can
>      handle a larger load then the switch.  Plus, the relay is
>      much easier to replace or trouble shoot in the event of
>      future service.   I have an original military grip w/cooley
>      hat.  It would be tough to find a replacement switch for
>      that, so I elected to use relays to carry both the roll and
>      pitch loads.  Has worked fine for 11 years. TEC
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