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avtar412
Joined: 15 Nov 2006
Posts: 22
Location: New Zealand
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 Posted: Mon Apr 23, 2007 1:49 am Post subject: Trim failure |
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My electric trim failed today during flight? Nearly hard back so was a slow flight home and took a good force to stay level. Once on the ground it started to work ok and seems to work fine. I'ts the later model unit used on the Series 5, anyone had this problem? Will look at the electrical connections next. ~j~
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Bob
Joined: 24 Oct 2006
Posts: 89
Location: Damascus, Maryland, USA
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| Posted: Mon Apr 23, 2007 2:34 am Post subject: Re: Trim failure |
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First, establish whether it was an electrical problem or mechanical. The trim switch housing actually contains two parrellel switches. Make absolutely sure that your trim switch is wired so that the two sides (sets of contacts) are in series and that there is no other way for power to get to the trim motor.
Mechanically, there was one report of a broken housing a long time ago, but controversy about cause. I personally would take the trim motor out and make a good visual and functional inspection.
Don't take trim failure lightly, as inadvertent trim settings change your stall speed and control characteristics. An Alaska Airlines plane MD-80-series plane crashed off the California coast after the trim broke free. I know of at least two airplanes (Baron and 1900) where the pilots lost control because they couldn't overcome runaway or extreme nose-up trim on takeoff. If trim runs away, it sounds counter-intuitive, but stay slow enough (nose up or reduced power) to where you can maintain control without worry about stall and land immediately. Faster speeds put a heavier load on the tail, as well as increasing the stick forces the pilot needs to fight. In the cases of the Baron and 1900, both accelerate fairly quick and the stick forces overcame the pilots.
Bob
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Fox5flyer
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| Posted: Mon Apr 23, 2007 3:55 am Post subject: Trim failure |
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It's probably the switch ~j~?. Mine did the same thing.
Deke
| Quote: |
My electric trim failed today during flight? Nearly hard back so was a
slow flight home and took a good force to stay level. Once on the ground it
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started to work ok and seems to work fine. I'ts the later model unit used on
the Series 5, anyone had this problem? Will look at the electrical
connections next. ~j~
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n981ms(at)yahoo.com
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| Posted: Mon Apr 23, 2007 4:19 am Post subject: Trim failure |
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I have had a periodic problem with my trim switch.
Symptom- trim stops working.
Findings- some carbon buildup on the contacts in the switch.
Cure- remove the switch from its housing and clean the contacts. I have had to do this 3-4 times in about 500 hours on the Hobbs. Lots of landings and take offs as my wife learned to fly. Therefore, lots of trim usage.
Note- There are several small parts inside the rocker switch. Try not to let them fall out and roll away. A little lithium grease helps hold them together during reassembly.
Maxwell S6/TD/IO 240
avtar412 <janderson412(at)hotmail.com> wrote:
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n85ae
Joined: 14 Mar 2007
Posts: 403
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| Posted: Mon Apr 23, 2007 6:27 am Post subject: Re: Trim failure |
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The trim motor armature tends to gum up. Take the two long screws out
the hold the back of the motor together. Slide the case off, and clean the
contacts with some fine emery closth, clean with something like acf-50
and reassemble. As I recall you need to use some paper clips to hold the
brushes in for reassembly.
You'll need to pop the actuator out to do it. It is a simple fix.
Jeff Hays
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kitfoxmike
Joined: 05 Dec 2006
Posts: 373
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| Posted: Mon Apr 23, 2007 6:42 am Post subject: Re: Trim failure |
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I'm not familiar with the 5. But if it uses the rayallen stuff and you have a relay deck, I would look right at that bugger. I had mine give the same symtom and it was that relay deck, I went and put some airbubble packing around my new one. Now if it's a big motor in the back with brushes, I would start there, take the end off the motor and clean the brushes.
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wingsdown(at)verizon.net
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| Posted: Mon Apr 23, 2007 7:36 am Post subject: Trim failure |
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If that doesn't work contact me off list I have one.
Rick
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avtar412
Joined: 15 Nov 2006
Posts: 22
Location: New Zealand
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| Posted: Wed Apr 25, 2007 1:13 am Post subject: Re: Trim failure |
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Comutator was all oily, must have been from the bearing. Cleaned it up with contact cleaner and worked well today for 1.7 hrs. ~john a~ NZ
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n85ae
Joined: 14 Mar 2007
Posts: 403
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| Posted: Wed Apr 25, 2007 8:20 am Post subject: Re: Trim failure |
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Probably should be part done as a regular maintenance item. Not sure the frequency. Probably after some number of hours operation. Mine gummed up about 50 hours old.
I bench ran the motor for an hour to seat the brushes and recleaned it
after that also.
Regards,
Jeff Hays
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