I was not NASA certified but worked with techs that were. They explained that minimum solder, ie concave verses convex solder blob, was due to not inspection of solder pad. If the solder was piled on the inspectors would reject it because they had a harder time determining cold solder pads, minimal solder allowed proper inspection of the pad.
Tim W4YN
>Judging from a direct response, it seems that my statement about using minimum solder to save lift-off weight during the lunar lander program generated skepticism...At that time NASA estimated that they saved 450 pounds on the entire Saturn 5 launch vehicle by limiting the amount of solder used for a "one-shot" launch...NASA did not use Mil-Spec, they had their own spec...
>
>Jerry, wa2dkg
>
>>>Anything that is built for NASA and will fly will most likely have to be conformal coated...Leaving excess lead length might cause the ends to protrude out of the conformal coating, defeating the purpose of the coating...I was not aware of any min-max lead length protrusion in my dealings with NASA....We used minimum solder to save lift-off weight and we always trimmed flush...<<
>
Tim O'Rourke
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