Bellcrank Bushing

jak · Post by **jak** » Mon Sep 14, 2009 9:12 pm

Hey guy's just want to let you know I'm making more changes to the book and I just want to let you all know up front.

Its our goal at Just to build the safest and most dependable aircraft we can. Therefore we are making this engineering change in reguards to the bellcrank bushing. It say's in chapter 5 page 12 step 9 the rivet in the bushing can be easily removed (drilled out) to allow dismanteling for inspection and lubrication. We know that some of these bushings are not being removed and relubricated properly during maintenance, therefore we are replacing this bushing part #F-1410.0 with an AN 6-40 bolt and an AN 310-6 nut. This change takes effect with serial# JA 185'

We urge you all to replace the bushing with this bolt when you do your maintenance.

When inserting this bolt make sure you put on a good quality grease (we use a wheel bearing grease). You may or may not need to use washers on this bolt to get the spacing right. After you get the bolt and nut in place secure it with an AN 380-3-3 cotter pin. (Do not over tighten nut the bellcrank should move freely.)

I hope this change does not cause you any grief but it really does need to be done. Thanks Jak

scubarider2 · Post by **scubarider2** » Sat Sep 19, 2009 8:54 pm

Thanks Jak....how often is this maintenance done? It is going to be a *&^% to redo mine. I have the one inspection hole on the side for which there is no way to make this change. The only way is to go through the back of the cargo hold. This means to tear out the carpet and drill out the rivets and pull the whole back out in that confined area. Any advice?

jak · Post by **jak** » Sun Sep 20, 2009 1:42 am

Dennis that bushing is supposed to be removed every annual and inspected and re greased, The bolt makes it easier to do this. Jak

Lynng · Post by **Lynng** » Sun Sep 20, 2009 9:05 pm

Jak,

I would say that now that we have more long term ownership and aircraft with serious flight time on them, actually writing a maintenance manual for the aircraft would be time well spent. Otherwise you rely on the individual to pull information from the build manual to service the aircraft.

Lynn

Wes · Post by **Wes** » Sun Sep 20, 2009 9:23 pm

Some time ago, I decided I didn't like rivets, so I re-did my bell crank with a long AN4 bolt that goes thru the center of the original steel pin and locks the pin in place with notched washers as shown.
I haven't had to take it apart yet, but it should be easy to disassemble and lube.

Finishing firewall and boot cowl attachment.

Wes

Dave Krall CFII SEL SES · Mon Sep 21, 2009 2:14 am

scubarider2 wrote:Thanks Jak....how often is this maintenance done? It is going to be a *&^% to redo mine. I have the one inspection hole on the side for which there is no way to make this change. The only way is to go through the back of the cargo hold. This means to tear out the carpet and drill out the rivets and pull the whole back out in that confined area. Any advice?

We hinged and latched the rear cargo wall for easy access to the tailcone, plus a window for preflight visual inspections.

scubarider2 · Post by **scubarider2** » Mon Sep 21, 2009 7:26 pm

Thanks Dave, looks like for the next annual {in a few more months} I will have a "project"....

Dennis

rmullins · Post by **rmullins** » Mon Sep 21, 2009 7:51 pm

When I installed my back panel I pop riveted some small triangular pieces of aluminum in the corners of the opening and put some of that super stick velcro on them. The panel stays securely in place but makes it a snap to remove to inspect whats going on back there...

Doug Baird · Post by **Doug Baird** » Fri Sep 25, 2009 8:03 am

I have made a modification as indicated above to the bellcrank bushing.
The first photo shows the installation of the bushing before drilling and riveting.
I was concerned that there was no lubrication on this and, as can be seen from the photo, the bellcrank had a quarter inch of sideways play.

The second photo shows a modified bushing with 1/16" weep holes drilled, the ends tapped with a cap in one end and a zerk fitting in the other plus two .0125" nylon washers punched to the size of the bushing.

Photo three shows the bushing (with a 90 degree zerk fitting) and washers installed.

Doug Baird · Post by **Doug Baird** » Fri Sep 25, 2009 8:25 am

Sorry ... first time posting photos & didn't get it right.

Doug Baird · Post by **Doug Baird** » Fri Sep 25, 2009 8:28 am

I appologize for the 'super sized' photos ... guess I should have asked if you 'wanted fries with it'. I'll be a bit more carefull in the future.

Wes · Post by **Wes** » Fri Sep 25, 2009 9:07 am

Doug,

Elegant solution! I like it.

Hmmm, now where's my grease gun?

Here is a link to a little photo shrinker from Microsoft that, when installed, will allow a quick right-click shrink operation on you photos. Works great.

http://download.microsoft.com/download/ ... ySetup.exe

Wes

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