I confess to wondering if it would be easier to remove the floor skin, replace the rails on the bench, then reinstall the assembly.
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Either way you'll scar up your forearm trying to get it fully through the floor's lightning hole. I found the rails fairly easy.
Like this...
DSCN2847-54pct.jpg
I agree with Jim; if you riveted the rails to the floor outside the airplane, you would have a similar issue when you riveted the floors into the airplane.
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Miles
“I envy no man that knows more than myself, but pity them that know less.”
— Thomas Browne
This is a question about seat rail installation. The forward two mounting holes of the seat rails are riveted through the center section (i.e., main) floorboard into the flange of a bulkhead. On my airplane, the outboard rail sits flush on the floorboard, but the inboard rail sits on the gear box floorboard, which overlaps the main floorboard, so there's a .032" height difference between the forward end of each rail. Is that correct?
SeatRailOutbdFwdReduced.jpg
SeatRailInbdFwdReduced.jpg
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Seems like a shim would be in order to reduce bending stress.
Richard Pulley
2014-2016 TIC170A Past President
1951 170A, N1715D, s/n 20158, O-300D
2023 Best Original 170A at Sault Ste. Marie
Owned from 1973 to 1984.
Bought again in 2006 after 22 years.
It's not for sale!
Neither seat rail in either airplane does that. Both are flat/flush on the floor. The floorplate beneath the pilot/co-pilots feet, which comes aft from the rudder pedals, lies alongside...but not beneath the seat rails. Here's my 170 pilot's side:
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'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention. An originality nut (mostly) for the right reasons.
That's the outboard rail. How about the inboard rail?
The outboard rail sits flush on the floorboard because the forward skin doesn't overlap behind the doorpost. You can see it in my picture and in the background of the picture above that Miles posted. My question is about the overlapping floorboards under the inboard rails, or, rather, *whether" they overlap under the inboard rails.
Doh. Do I have to clean up the coffee spill first? ( This is the pilots right seat track at the forward point. Don't know why I can't rotate it right side up. I"ve saved it both ways and this is the only way it'll post.)
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'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention. An originality nut (mostly) for the right reasons.
hilltop170 wrote:Seems like a shim would be in order to reduce bending stress.
It's at the foremost area where the track is only used to "release" the seat... it's not a locking-position so unlikely any weight is on it there.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention. An originality nut (mostly) for the right reasons.
To help stop the arms getting marked or cut when digging around under the floor boards , I mask the edges of the inspection hole with a heavy masking tape . I also leave it there when replacing the inspection covers as it helps to stop dirt edging it’s way under the covers and migrating under the floor .
Cessna® is a registered trademark of Textron Aviation, Inc. The International Cessna® 170 Association is an independent owners/operators association dedicated to C170 aircraft and early O-300-powered C172s. We are not affiliated with Cessna® or Textron Aviation, Inc. in any way.
) -- the rail sits on top of the overlapped floorboards.