Day Four - Replacement
A working computer is nice, but it needs to be installed in the FAA certified rack. So we had to swap out the bad chassis for the good one. Here -- Ken starts removing retaining bolts.
Removing the handles from the backup detector control computer was not anticipated, and much more difficult than it looks.
A little blood and sweat later -- literally -- the new system is in place. Testing was again successful and I could sleep well...
But no immediate rest for us, first we had to tidy up the entire instrument control rack (which is called the "PI Rack" in SOFIA terminology) in preparation for aircraft installation in the morning!