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Uups!!!, "concrete" is Spanglish for "specific". SB is preventive, it gives instruction to add sealing on some edges of the part but doesn't cover any repair once there is corrosion.

Thanks for all your replies. Of course we are expecting to have corrosion on both skin and core in the same areas, but as commented in my first post we need to remove and replace the whole skin. We expect to need core replacement in corroded areas as well, but reskinning will also affect large...

Recently we have been asked to repair an aluminum honeycomb part that we suspect has corrosion inside on a large area. Due to the size and function of the part we are forced to replace the whole external skin (0.5 mm thick), but we need to keep internal core if at all possible. Does someone...

As far as I know MMPDS is freehttp://www.everyspec.com/FAA/FAA+-+General/DOT-FAA-AR-MMPDS-01-_METALLIC_MATERIALS_PROPERTIES_DEVELOPMENT_AND_STANDARDIZATION_2512/

For a hi-lok is easy to find OS pins (except for 5/32") but if we talk about blind fasteners sometimes your only option is to go to next dash, and that could be a problem with edge distance. If we consider a situation where we have to discard all other options and have to live with the same...

As you mention the alignment is reasonable for rivets, but we are more worried about circumstances where we are using blind fasteners or hi-lite, which do not swell on installation.

The practice of copying existing holes from structure to repair parts like doublers or splices is used as standard. Although it is assumed that the holes are completely aligned if you use guide bushing to transfer them between parts, if you take into account clearance between bushings and hole...

Not enough clearance per spec dimensions. We will use standard washer and ream to an acceptable diameter. Thanks everyone for your support.

HL87 is the collar of choice for the tension bolt HL64. However, we are trying to use a nut instead of a collar as the joint is supposed to be removable. We will use MS21133 nut, and are looking for a OS washer. The only one I have found is MS14226, but spec appears to be cancelled. Does anyone...

Thanks for the replies. HL64 is a good choice for us, now we only need to find a good tension nut.

We have an aircraft pending repair with some holes damaged. Holes are used on a joint with AN5-6A bolts (5/16-24 steel bolts) We can't go to AN6-6A cause we don't have enough edge distance in one of the joint members. The damage can be removed by enlarging hole 1/64 and we have found two bolt...