Monday, April 22, 2019

PH Aviation Flap Motor Install

I decided to install the new Flap Motor from PH Aviation. This flap motor replaces the stock Vans flap motor. I like the new one because it has a built in up and down stop, built in position pot to interface with the G3X, and has a different motor that may not suffer from grease contamination.

The installation is a little different than the Vans version.

First off, I made the F767 plate a little longer than the original to make sure the motor support brackets were completely contained on the plate. This eliminates a spacer and also provides more strength for the motor supports.  In the picture is the new F767 plate, and the stock F785A/F785B Backrest Brace and the stock F766A/F758 Flap actuator channel.
The new actuator is about 1 3/4" longer so I moved the actuator up higher. In the photo below, the hole to the left is the original location of the top pivot bolt. The added distance is the line on the right. I don't need to move the flap actuator the entire way to the right because I can also lengthen the actuator links to the flaps, if needed.
Here is a picture of the brackets being drilled to the Flap Actuator Channel to use AN470AD4-x rivets. The brackets are per the PH Aviation instructions that came with the flap motor. I used a AN960-416 washer and a little paper shim for spacing. The AN960-416 will become two AN960-416L washers (one on each side) and the paper shim is to ensure the flap motor is easily removed once the brackets get riveted on. The bolt will become a castle nut to allow some freedom of movement, as in the stock installation.
The assembly was drilled to the seat back brace per the plans.
Here is the final installation of the PH Aviation Flap motor. The rest of the installation follows the stock plans. (Please note, I still need to drill a hole in the Flap Actuator channel and add a doubler in order to remove the bolt)
If you notice, I have been putting off priming and painting the floors and interior panels. It is becoming a pain to keep working with things cleco'd together. I might have to bite the bullet and get the interior panels painted.