Thanks mate!
I was going to attach these brackets this weekend.
Would it make sense to use Cherry rivets for all the holes on the brackets?
Cheers
Oleg
I question why only the smoking rivets (6 on each side) get replaced with the Cherry rivet.
This is a shear application and the reason the designer chose 18 rivets was to transfer the calculated load in shear from the WD-1204 engine mount bracket to the F-1202 panel base. The LP4 rivet pull stem does not break even with the manufactured head thus filling the hole solid. The manufactures MINIMUM SHEAR for 1/8" LP4 rivet is 162 pounds.
Minimum shear for the Cherry CR3213-4 is 236 pounds
Minimum shear for the MS20470 solid driven rivet is 664#
The smoking is from movement, once those are repaired with a more solid Cherry we now have those 6 carrying a greater load than the other 12 in the bracket.
I am building an ELSA to the plans so I am just wondering if Mike Newall
has the right idea here.
Waiting for Scott to weigh in on this.
Jerry
'
Does this make sense...or not?
EBB
Scott, on the two planes that had a problem, do you know if the rivets had been installed correctly, or at least in the preferred way with the manufactured head on the panel base side? Two aircraft out of nearly 500 is a very small sample, but just wondering if rivet orientation could be a contributing factor in this case.
head on the top for these rivets? Not sure I can get under there anymore to put the rivets "up", especially with the brakes, etc., in the way.
Wayne 120241 (402.5 hours)
Yes
Manufactured head on the thinner material is best practice but it is not a requirement.
Lee,
I helped an SLSA owner remove the avionics bay cover. They way over did the sealant and we had to slowly work a knife blade along all the sealed surfaces to free the avionics bay cover.
Rich
head on the top for these rivets? Not sure I can get under there anymore to put the rivets "up", especially with the brakes, etc., in the way.
Wayne 120241 (402.5 hours)
Regarding the SB for loose engine mount bracket rivets, I took the FWD fuse cover off and had a look. The rivets look fine, no sign of greasy or smoky film. If I do replace them, I am thinking I need to remove the bracket that supports the radio just to get a clear shot at drilling out the old rivets as well as getting a rivet gun down in there.
Has anyone completed this SB on a finished -12 ?.
And, I am unsure what sealant to use when re-assembling. I don't want to glue it down permanent as I read others had by using RTV.
Any ideas welcome.
right side
left side