Recent content by A380istoobig

Mr Taylor, I agree with you. The original post was looking for a good installation refenence (which that drawing is). The actual use of the drawing would require the appropriate level of approval (FAA 8110-3, FAA 8100-9 etc). The approval would require the analysis and cautions you mention above.

If you have access to it, have a look at Boeing Drawing 65C38131, Freeze Plug MRB Repair Installation Procedure.

As per Boeing SRM 51-40-02 Figure 3 and BAC5004-1, there is no minimum sheet thickness for the tail side. From personal experience, provided the 0.050" layer is backed by the 0.200" layer, there will be no damage caused by the bucking.

For what it's worth. Boeing spec BAC5435. It is Boeing proprietary though. Maybe you're working on a Boeing airplane...

Mr. Taylor, Although those are oversize blind rivets, my hole diameter is 0.225 inches. As per Boeing spec BAC5004-3, those fasteners are good for a hole diameter of 0.215 – 0.218 inches. We ended up having to disassemble a bunch of internal structure to install a solid BACR15DS7D (as per...

I'm looking for a 7/32 countersunk rivet. Material = 2000 series aluminum Countersunk head = 100 degrees Something like the NAS1739, NAS1399 or CR3243, but available in 7/32 inches diameter. I don't want to go to 1/4 due to edge margin concerns. Thanks for any help.

BACR15DS7 only comes in 2017-T4 (D), or 7050-T73 (KE) not monel (M). That is one of the first places I looked too.

I have a repair drawing calling for a NAS1200M-6P rivet (A solid 3/16 dia 100 degree flush shear head passivated monel rivet). The problem is the hole dia is currently 7/32 diameter and the repair doubler (0.063 Cres) is currently countersunk. I need an oversize 7/32 dia 100 degree flush...

Mr. Taylor, Thank you for your caution, but the SRM covers me. As per the Boeing 737 classic or next gen SRM 51-40-04 Figure 2, it provides the torque values for MS nuts for both shear and tension head hi-loks.

As per the Boeing 737 classic or next gen SRM 51-40-02 paragraph 7.D.(3) it says, "Where access is not available for the installation of the special collar, it is permissible to use locknuts." I typcially use MS21042 nuts (MS21042L really, the L indicated a dry film lubrication) in lieu of a...

This may be a little helpful Countersunk head rivet: NAS 1097 (BACR15CE for the Boeing folks) the oversize can be a NAS 1241 (BACR15DS). Pay attention to size and material. Protruding head rivet: MS20470 (BACR15BB for the Boeing folks) the oversize can be a NAS 1242 (BACR15BB or BACR15ET)...

As per Boeing SRM, the countersink depth must not exceed 60% of the material thickness. (ref 737 SRM 51-40-08 Figure 7). Anything greater, the material is considered knife-edged and a poor fatigue detail. However, most Boeing AR's and DER's will provide FAA approval to coutersink a maximum of...

The UK spec for 5052 sheet is 2L55. I could not find LCL in my tables.

I attended a course by Alteon Training in Seattle called "Composite Repair Repair of Advanced Composite Structures For Engineers" not too long ago. http://www.alteontraining.com/training/coursedetails.aspx?id=1948 The same question posed to the instructor. The answer was that a lot of the...

Dimpling is not a recommended practice. It produces stress concentrations and can cause warping. However, a good source of info is if you can get your hands on a Boeing classic SRM and see 51-30-07.