Brief Description: Fwd upper skin riviting-4. The cherry max rivits i
My cr3214-4-04 rivits came in so installing them was the job today. These are for the gear tower area on longeron to upper skin primarily. However, there are some others that are very difficult to get to as well just aft of the gear tower in that area just behind the panel. And then two more that I had covered up when I installed the center bulkhead caps. I didnt want to try bucking thru the access covers I made for my map light because they are quite small. Ive heard of others that used these rivits for the whole skin infact. As it turns out I used a total of thirty of these rivits along the longeron (15 each side) and the rest was done with regular AN rivits as called out. I ealy like how close the rivit head is so close to same diameter as a AN3 aluminum rivit. To instal the rivits as mentioned. I would run a #30 reamer thru the #40 size hole carefully. Then hit lightly with countersink while testing fir of the cherry rivit. Once I had the microstop set, This moved a bit faster. I then squeezed the rivit with standard rivit puller. I did this 30 times.
I used aprox 5 cr3214-4-05 size for the corner left side too. those required longer rivits due to extra thickness.
Picured below is the cherrymax rivit gauge. The rivits along the upper longeron show between the 3 and 4 on gauge and the instruction dictates rounding up to next longer rivit in this case. Hence, dash 4 used.
The panel bulkhead has about 3 rivits on each side that are somewhat blocked by some things I have screwd in to the panel. For these, I used cr3214-4-02 rivits. There were another 4 that I used for some difficult spots on the baggage bulkhead. All the others are done with standard rivits.
There were aprox 8 rivits that were in dire need of a re do! These were in the radius area of the firewall upper flange. They just dont want to play nice with the squeezer upside down for some reason, After two failed attempts on one of the rivits, I resorted to using buckking bar and hammer! That worked much nicer in that area.