Canopy Actuator - Part 2

This builder decided to remove some weight from the actuator bar by drilling a series of 8 mm OD holes at a pitch of 20 mm. Do not attempt this unless you have a drill press and are experience working stainless steel. 

All the working faces were polished using a flap wheel in a drill press. All the parts are reassembled using M4 Hex bolts, washers and nuts. After adjustment it was found that the mechanism was very stiff accompanied with metal on metal grinding. After a quick check the source was located at the back spring mount.

Witness marks from spring stop

After investigation it was determined that the rear spring mount was fouling on the rear tang of the actuator due to a combination of tight tolerances and installation by the builder. As this bracket is only a stop for the spring it was decided to remove it and enlarge the slot width and depth with a 5/32 chain file.

Actuator bar assembly

The assembly is re-installed,  adjusted and tested to be finally rewarded by the "thunk"  of the spring returning the bar.

To mount the handles M6 stainless steel all thread rod is used. Determine the length by ensuring the thread is fully engaged into the handles to provide maximum support to the aluminium. 

The handles threads are treated with Loctite 243 at assembly and allowed to cure.

All working faces of the actuator were treated with "Dry Lube" at assembly.


Do NOT rivet either of the cover panels at this time as the interior cockpit covers are riveted under the top angle on both sides.