gregorygoodwin wrote:You don't shave the briles type rivets after installation. If done correctly, they have a domed appearance that is slightly higher than the surrounding surface. This is normal for these rivets.
gregorygoodwin wrote:The amount of rise above the surrounding surface for a correctly installed briles rivet is only in the area of maybe two to four thousandths of an inch. The crown of the rivet is a smooth domed shaped that is probably negligible in drag. Also, if you ever look closely at a MD10 or MD11, the production fasteners on the plane have a slightly domed appearance. These were called DAC pins for Douglas Aircraft Company pin. They are similar to a Hi-lok fastener and were used only on the production line as they weren't considered a repair fastener. As for the staining or "smoking" fasteners, the brile rivets seem to have less of this than the standard type fasteners such as a MS20426 or NAS1097 (both countersunk type rivets). The worst fastener type for this is blind rivets such as Cherrry or Huck rivets. Another interesting FYI item is that the Boeing SRM's state that you can not substitute a MS20426 or NAS1097 type rivet in place of a brile rivet. This goes for the countersunk rivets only. You can replace a brile protruding style rivet (FT) with a MS20470 protruding style. Because of this stipulation, you often see repair doublers on the Boeing ships with protruding head rivets in them. This is because the shop doing the repair probably didn't have the unique countersink cutters for the brile rivet, so they shot on the repair with protruding rivets that they did have. This is acceptable, but the SRMs will state that you will probably incur a performance decay for using these fasteners in your repair if in a aerodynamically critical area.
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