Jump seat installation

[GAHorn]

OK everybody... Here’s a question asked of me in a PM and frankly, I’m not that familiar with the seat types. What say all you guys/gals?

“ I have 2 cessna jumpseats (the kind that screw into the side wall and the backbrace is removable for loading etc.) I have paperwork to install 1 (behind the pilot) My mechanic does not want to install the 2nd one (behind the copilot) without paperwork. Is there paperwork to show how to do this ?”

[n2582d]

F. Atlee Dodge's STC allows for the installation of either the left, right, or both folding jumpseats.

LakeVue Aeronautics has the STC for the former BAS / Blancher Model 101 folding seat. If this is the seat in question I'd write or call Denny at LakeVue Aeronautics to see if a seperate STC is required for each seat. The wording refers to "a" seat but I'd be surprised if separate paperwork is supplied for each seat when one orders two seats.

The third aftermarket rear seat is this one from Airframe Innovations. They looks similar to the optional factory C-180/185 seats.

[hilltop170]

OK everybody... Here’s a question asked of me in a PM and frankly, I’m not that familiar with the seat types. What say all you guys/gals?

“ I have 2 cessna jumpseats (the kind that screw into the side wall and the backbrace is removable for loading etc.) I have paperwork to install 1 (behind the pilot) My mechanic does not want to install the 2nd one (behind the copilot) without paperwork. Is there paperwork to show how to do this ?”

There is no paperwork that I know of for the installation of those seats in a C170. The easiest thing would be to duplicate the approval for the first seat. They are different than the Atlee Dodge, BAS, or any other after-market rear seats.

If they are what they sound like, they are original equipment utility seats in C180/185s that basically just sit on the floor and attach to the outside with the bolts mentioned. Since no structure would be modified it seems to me it would be a minor alteration unless you need a Field Approval to add a nut plate to the doorpost, the other anchor is already there from the original bench seat. So if the proper attach hardware is fitted to the plane, couldn’t it be a logbook entry w/wt&bal updated stating replaced original rear seat with Cessna p/n xxxxxxx, etc per C185 installation?

The other issue is seat belt attachment. Seat belts for those C185 seats attach to seat belt brackets riveted to the side walls and a common center anchor where the old seat, rear-center, attached to the floor. Again, duplicating the C185 seat belt installation would be the easiest thing to do since all parts are already designed, engineered, and approved for that installation.

[n2582d]

Thanks Richard, I clearly didn’t read George’s question closely enough. Like George, "I’m not that familiar with the seat types." I looked through the various Accessory Kits for the C-180/185 but only found kits for the bench style seats. Here's a couple of screen shots from the '74-'85 C-180/185 IPC.

Fig. 54 C-180/185 IPC, Click to Enlarge

Click to Enlarge

There are several threads on BCP regarding these seats. This entry may be the most helpful.

[bat443]

Since the seats you have are duplicated as PMA replacements by Airframe Innovations if it were me I would just contact them and see if they would sell you their STC only. Easiest route to a legal installation. They also handle the seat belt installation issue.

Tim

[mit]

I installed them with a field approval back in the 90's before field approvals got complicated.

[n2582d]

Since the seats you have are duplicated as PMA replacements by Airframe Innovations if it were me I would just contact them and see if they would sell you their STC only. Easiest route to a legal installation. They also handle the seat belt installation issue.

Tim

Their PMA PQ4180CE for their seats is linked to their STC SA02523AK. According to the PMA this STC apparently allows for the installation of these seats in the C-170. What's weird is that I can't find that STC listed in the FAA database even though the PMA was issued over a year ago. Edit: I contacted them and they said the problem is with the FAA. Here’s the AML for this STC:

SA02523AK (ST02011AK-A) AML Rev 1 - 9-2-22 (1).pdf

(748.36 KiB) Downloaded 36 times

The right seat is a mirror image of the left seat. If I were to try and get this additional seat approved I'd go to the FSDO and request a field approval as Richard suggested. Rather pricey but Airframe Innovations sells the sidewall seatbelt attach bracket here.

It would be cheaper to duplicate a mirror image of the one on the left side. The field approval for the old seat may not have Instructions for Continued Airworthiness (ICA's) -- they weren't required years ago. Those would be easy enough to write up or copy from Airframe Innovations (assuming their STC exists).

[dstates]

Lakevue’s website talks about having seat belt brackets available. Here is the link and text.

“Seat belt attach option kit: $250. This includes 4 attach brackets that rivet between the skin and bulkhead (same as late model 180-185). Included in the STC approval. Call me for details.”

&

“Notes: **Early model aircraft had seat belts attached directly to the bench seat. In these applications, late model seat belt attach hardware may have to be installed. We can provide that hardware if needed. Later model aircraft require no changes.”

http://lakevueaeronautics.com/id2.html