Safety Directive SD-00001 for RV-12/12iS - Elevator Trim Servo

[Piper J3]

Maybe someone (funflying) could make a short bill of material for the Van?s parts to order for complete new rebuild ? lower bushings, grommet, rivets, etc. so everybody doesn?t have to do their own searching.

[Bob Y]

One of the items Greg didn?t mention in his initial posting are the terminals for the servo leads. If one doesn?t upgrade to the new D-sub connectors, you?ll need another set of terminals to attach to the new servo leads - if you intend to reuse the existing connector. Guess the other option would be to cut the leads from the old connector long and splice them to the new servo leads so you could reuse the existing one. Just depends on how far one wants to take the replacement.

[pilotyoung]

Jim had a good idea about a parts list. If you don't want to reuse the bushings and grommet, you will need to order 2 Bushing TFI-0304-04, 1 grommet SB187-2, and 4 LP4-3 rivets. I have not replaced mine yet, but from looking at the drawings that looks like the additional parts needed. I am planning on reusing those parts, bushings and grommet.

[funflying]

Thanks for the suggestion Jim and to John for looking up the parts and their numbers. And good caught Bob about the connectors for the new servo.

I plan to order the pivot bushings and grommet since I?m replacing the servo, tray, and plug. Thanks again all.

[Jshepherd]

Just received servo tray and bag 2670 trim servo retrofit to replace my old trim servo. The only parts in bag 2670 are d-sub pins and connector for new style tray. I guess I missed where you have to order required bushing and nut separately. I assumed all the parts needed would be in a bag labeled trim servo retrofit. Guess that’s what I get for assuming!

[pilotyoung]

And this is a suggestion to Vans. Why not have a bag with all the parts needed to replace the tray, including rivets, bushings, grommett, etc. On other Service Bulletins, the kit to comply includes all parts. Why not treat this one the same way?

[Tony_T]

I also assumed the plastic bushings and small snap bushing for the wires would be in bag 2670. They are not. I broke one of the old pivot bushings trying to get it out of the old tray so had to send off another order to Van's for small parts.
Here's a couple of other tips.

Someone mentioned reusing those U shaped reinforcements used on the old servo. They won't fit the new servo. The new servo is quite a bit larger.


You can reuse 4 of the old screws to mount the servo but they are a little long. I don't think that matters.


I used this wire diagram from the iS wire diagrams to organize the wiring.

My older airplane harness and old servo wiring had two white wires for UP and DN power and the latest harnesses have a white and black so you can't get the UP/DN wires backwards. The newer airplane harness also has the D-sub male connector already on the airplane harness. Those of us with the old harness have to install the male D-sub pins.

I crimp them (see Stein videos) although I guess you can solder them as well.

I seem to remember from the Dynon auto-trim setup with the AP-knobs panel you could switch this function in the software if you got them backwards. I could be wrong on that. I didn't get that far today since I quit to order the pivot bushings.
I did temporarily hook up the servo motor to see if the cockpit switch would run the servo and if the trim widget on the EMS would track it.


Everything seems to be working, just need to do the trim calibration when I get those pivot bushings and put everything back together.

Yeah, not knowing what was going to be in the 2670 bag and then researching the parts and wiring diagrams was a pain. There were 3 different connector styles used on the trim servo wiring over the years, spades, molex, and D-sub.

Ray Allen was a pleasure to work with. The new servo is shipped quickly. The cost will be the $90, but you pay $219 until you return the old servo for the core charge credit. My old servo is already on the way.

[GatorsR1]

Decided to go ahead & replace the trim servo assembly that hasn't even flown yet. Looked over the latest KAI and ordered the following from Van's last night :

(1) F-1287A-1 Servo Tray

(1) BAG 2670 (hoping all the DSUB plugs, pins, sockets are in it, anybody know exactly what's in it?)

(2) TFI-0304-04 Tray BUSHINGs (in case I booger up the old ones in original tray - and can always make better ones the second time around

(1) SB187-2 Snap BUSHING (again, in case I booger up the old one that servo wires run thru)

(1) AT6-058X5/16X4 Al Tube to cut to length of the two bushings (again, I want to try to make even better ones this time)

(1) AN315-3R Jam Nut (just in case)

Spoke with Gary at Ray Allen today (on way to Post Office with old servo in hand) to confirm a couple of things and work thru the deal.
He said it's fine to mail the old servo in a simple "bubble wrap" envelope. Packaging isn't critical, they just what to examine & keep track of the returns.
Wanting to save a few days, I went ahead and ordered the replacement actuator on credit card and they'll take care of the math ($219-$90 plus shipping) when the old one arrives.
Very knowledgeable & friendly service and he said their "company plane" is an RV-12 so he knew exactly what I was trying to articulate.

[Tony_T]

1 female d-sub
1 male d-sub
6 female d-sub pins ( 1 extra )
6 male d-sub pins ( ditto)
2 standoff nuts
2 4-40 allen screws
2 4-40 all metal locknuts
a d-sub pin tool

The bag parts are just for the d-sub installation. My nomenclature may not be perfect on these parts but you'll get the idea.
Those little metal locknuts are really tiny. I had no US socket or wrench that small but found a 4.5mm socket fit them perfectly.

There is a use for that extra jam nut (it's not in the bag) - see Section 11iS/U-07 Fig. 3

[hiline]

In the install directions and pic it does not show the use of the jam nut anymore,but says to order one which i did,but I dont see it being used anymore?
Comments on this?
Thanks,