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Shoulder Harness

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I need to know which shoulder harness would work for my 108-2. Any recommendations? Any installation ideas?

Posted : 30/07/2006 12:26 am
Posts: 299
Reputable Member

Wag Aero sells an STC'd shoulder harness for the -2. Spuce sells the same one too.

Posted : 30/07/2006 12:13 pm
Posts: 9
Active Member

Hooker Harness makes a neat alternative. They sell a harness that hooks to your rear seat belt. If you're not carrying anyone in the back, you just use the rear belts to secure the harness. Ony around $30 per side. Not perfect, but an option............

Posted : 31/07/2006 3:32 am
Posts: 18
Active Member

I used the ACS unit: Straight forward installation requiring a couple of slits in the headliner. I haven't yet figured out what to do with the pretty long free end of the upper yoke. If you/your co-pilot has a sensitive neck, get a sheep skin pad to slip over the harness as they will rub your neck.
Some vertically challenged pilots have complained about reaching the flap handle with the harness tight.
Getting the lap straps adjusted for all body types has been tough..I fly a lot of young eagles..big and small.
Overall, do the is a safety issue best not left undone seeking perfection.
jim feighny

Posted : 31/07/2006 11:32 am
Posts: 115
Estimable Member

I did mine on my 1939 Stinson HW75 by obtaining a complete set of Piper Warrior seat belts, shoulder belts, and retractors from an aircraft salvage, even the correct color to match my plane. I manufactured a clamping arrangement the the tubular framework for the retractors above and behind the headliner with re-inforced slits for the shoulder belts to come through the headliner. I modified the lapbelt attachment bolt sizes to attach to the existing lap belt attachment fixture. All of the work was done and approved by myself with my IA, and approved by the FAA on a Form 337. I presume that the tubular frame of the 108's is very similar to the HW75/105. The cost was minimal, only what I had to pay the salvage firm, and now I have modern seat belts, and retractable shoulder harness. No problem at all reaching the flap handle. I could supply copies of the 337 and various photos if anyone is interested. Let me know if I can help.


Posted : 31/07/2006 12:17 pm
Posts: 5
Active Member

I need to know which shoulder harness would work for my 108-2. Any recommendations? Any installation ideas?

I bought a set of Inertia Reel Shoulder Harnesses from BAS ( ). I'm installing them in during my annual this month. They look easy to install and are well built. I believe installation is exactly the same in the -2 as the -3. BAS has a Stinson frame they've used for measurements, so they fit perfectly in mine.

In short, lap belt portion mounts exactly the same as whatever you have now. Shoulder harness is a Y-harness coming from the inertial reel. The reel itself is mounted to the cross member just above and behind the pilot/pax seats. That's the same place the non-inertial-reel systems mount.

Both my FSDO and my IA have already said using the BAS belts will be no problem.

Cost, however, was a bit steep... about $1000 for the pilot and pax seats.

I debated a lot and ultimately decided that the inertial reels are a safer implementation (in my opinion) and are worth the cost.


Posted : 01/08/2006 11:53 pm
Posts: 4
New Member

I Have inertial reel harnesses in my 108-3. I know of too may incidents of people drowning in perfectly survivable floatplane accidents except that they hit the instrument panel with their head and drowned. My harnesses were installed under a field approval and came out of a "boneyard" so the cost was not so high. The problem with non-inertial harnesses is if they are to be effective, they restrict your movements. You have to leve them somewhat loose so you can reach down to use the flap handle. Guess when that happens? Right , during take-off and landing, just when you need them the most. Unless you have electric flaps, I think your'e wasting your money on "fixed" harnesses. Yes most of my flying is on floats.
Bob Picard

Posted : 06/10/2006 8:12 am
Will Ware (Webmaster ISC)
Posts: 399
Honorable Member Admin

I visited , but I did not see a kit for Stinson. Any more details on that?

Posted : 02/08/2018 3:34 am
Posts: 21
Eminent Member

I had contacted BAS recently and this was the response, which by the way came rather quickly after my inquiry as well as with drawings and info... copy and pasted from e mail as written...

We do not have an STC’d system for the Stinson, but we have helped numerous people get them installed in their aircraft. I have attached some information regarding installing 4 point inertia reel harnesses in your Stinson. We no longer will build the brackets for the Stinson. We can provide the harnesses, dress covers, and hardware, but the brackets would have to be custom made by an aviation (preferably) metal shop. We can provide the dimensions and specs as necessary. They will need to use certified aviation steel (4130 Cond n Steel tubing). Most any aviation shop should be able to provide. The harnesses are $637.50 (Black) or $657.50 (color) each for Standard or Utility buckle. For a Rotary Buckle, the cost would be $942.50 for each black harness and $962.50 for each color harness. The plastic dress covers are $50 for a pair and the hardware kit is $30. I will send you the exact material specs if you decide to proceed. The general specs are 1 inch and an eighth X 4 inches long 4130 condition N Steel Tubing. Let me know if you want to proceed. The harnesses are special order, so they take about 4 weeks.


Posted : 03/08/2018 12:58 am
Posts: 777
Prominent Member

No field approval or STC is required to put shoulder harness in your Stinson. There is an FAA letter about this and it may be on the Yahoo web site. I have it in one of my computers, but that computer has failed me.
But, the letter exists and it is to promote safety without undue expense and frustration.

Posted : 04/08/2018 4:05 pm
Posts: 565
Prominent Member

When I get back from vacation, I'll make sure to include this letter on the Stinson Club web site.

Posted : 04/08/2018 4:34 pm
Posts: 300
Reputable Member

I obtained the BAS inertial kit for the Stinson years ago while they were still providing them. It consisted of the inertial reels with belts and a split 4130 steel tube with weldments for the attaching bolts. They simply clamped to the overhead transverse structural tube. No structural airframe modification was required. They provide maximum restraint with freedom of movement so that reaching the flap handle is a non-issue. We documented the installation as a minor change with a log book entry, according to the FAA memo that Larry and Brian have referenced. I hated to cut my headliner, but I decided protecting my face from a sudden stop at the panel was more important. If you scroll way down the photos on the Yahoo site there are some pictures of the fabricated clamps. Like all things aviation, BAS probably decided not to provide the clamps to avoid liability exposure.

Stinson harness(2) by stinsoner, on Flickr

Dennis Crenshaw. N6102M.

Posted : 04/08/2018 7:39 pm
Jason Tepool
Posts: 169
Estimable Member

I wouldn't mind upgrading to inertia reels. I have shoulder harnesses, but no reels.

Posted : 05/08/2018 3:49 pm
Posts: 113
Estimable Member

Fixed shoulder harness mounted to the frame and an EZ Flap flap handle extension....

Posted : 06/08/2018 3:53 pm
Posts: 300
Reputable Member

A friend has the EZ Flap handle installed on his '59 straight tailed 172. Can you still reach your flap handle with the shoulder straps snug? I'm a hopeless purist and I just didn't want to install that in my Stinson. The BAS inertial reels were expensive (~$1000) but they sure are nice; and if I ever come to a sudden stop with terra firma they might just save me. So comfortable, you forget you're wearing them.

Dennis Crenshaw. N6102M.

Posted : 07/08/2018 3:08 pm
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