[rjm727]

RV14 plans 26-06 do not mention if each seat rib bolt gets one washer or two. Consulted wiki but not mentioned. Thoughts?

AN3-10A
NAS1149F0332P
MS21042-3

 

[bjdecker]

RV14 plans 26-06 do not mention if each seat rib bolt gets one washer or two. Consulted wiki but not mentioned. Thoughts?

AN3-10A
NAS1149F0332P
MS21042-3

Just one. If it was more than one, you would see a call out like "2x NAS1149F0332P"....

 

[Desert Rat]

Previous poster has it right, but just for future reference;

in the absence of other info, the industry standard default is a minimum of 1 washer under the nut, but if the nut is bottoming out on the bolt shank before it gets tight, you can go up to a maximum of 3 washers to take up the extra space. Any more than that and you change to a shorter bolt.

 

[KenB]

Another future reference. Whenever you have a building technique question, "wiki" should be spelled "AC43.13". It's the bible of all things built and repaired on aircraft and the online version is searchable.

 

[Taltruda]

Another future reference. Whenever you have a building technique question, "wiki" should be spelled "AC43.13". It's the bible of all things built and repaired on aircraft and the online version is searchable.

I think Wiki he mentioned is a RV-14 help and tips page they call the Wiki pages.. not standard Wikipedia!

 

[cvairwerks]

Industry practice for bolts going into close tolerance holes require a washer under the head to prevent the radius on the shank to head junction from deforming the hole face.

 

[DanH]

Another future reference. Whenever you have a building technique question, "wiki" should be spelled "AC43.13". It's the bible of all things built and repaired on aircraft and the online version is searchable.

Common misconception.

Seriously, read the title page for the FAA's position. AC43 is to be used only in the absence of manufacturer's repair or maintenance instructions.

Put another way, you're required to look elsewhere first, and use AC43 only as the last resort.