Rear should harness retrofit

[bradp]

Hi all

I recall Clarence some years back had a few pictures of a rear should harness he had installed in his ? E with some custom brackets. I haven’t seen much more for retrofitting vintage and early J with rear should harnesses. 
 

I’d love to be able to get some shoulder harness for the rear seats as the kiddos are growing and the little one is about to be out of her 5-point booster seat. 
 

Has anyone used the rear bench’s lower  bushing where the lap belts click in with the belt routed behind the seat back, over and back down? Seems like it would be better than nothing and not require modification to the airframe.  I suppose  geometry would be acceptable as long as the kids are short enough to have their shoulders lower than the top of the seat back frame. 

[Guest]

The J model steel structure has the same two bolts that I used in my E model for the rear seat shoulder belts.

[TNIndy]

If the E model has the two bolts, I would assume the F model does also? What paperwork is required? 

[Guest]

3 hours ago, TNIndy said:

If the E model has the two bolts, I would assume the F model does also? What paperwork is required? 

The F model should have the same structure.  I made and installed fittings of my own design, made of thicker materials than the Mooney fittings and installed them myself as a maintainer.

This might be helpful,

https://www.faa.gov/documentLibrary/media/Advisory_Circular/AC_21-34.pdf

[mooniac15u]

7 hours ago, bradp said:

Hi all

I recall Clarence some years back had a few pictures of a rear should harness he had installed in his ? E with some custom brackets. I haven’t seen much more for retrofitting vintage and early J with rear should harnesses. 
 

I’d love to be able to get some shoulder harness for the rear seats as the kiddos are growing and the little one is about to be out of her 5-point booster seat. 
 

Has anyone used the rear bench’s lower  bushing where the lap belts click in with the belt routed behind the seat back, over and back down? Seems like it would be better than nothing and not require modification to the airframe.  I suppose  geometry would be acceptable as long as the kids are short enough to have their shoulders lower than the top of the seat back frame. 

When I had an M20D I asked Mooney about retrofitting rear shoulder belts and they told me the short body Mooneys don’t have the needed tubular structure to attach them.  I assume this is why Clarence had to make a custom bracket.  My M20J has factory rear shoulder belts.  I’ve never really looked at how they’re attached but the M20J has an additional steel tube, not shown in Clarence’s diagram, in the right position and I assume the shoulder belts are attached there.  The extra tube is part 73 in this diagram.  Presumably you can install rear shoulder belts the same way the factory did without too much custom work.

[Guest]

Another page from the IPC showing the rear shoulder belt anchor point in a J model