What type of salary would you request for this job?

I have an interview next week, and though it's not a developer position, it is for an aviation software development company, and the thing is, I have no idea what a job like this would pay (I usually freelance my video production services). Here is the job posting: https://www.indeed.com/cmp/Ultramain-Systems,-Inc./jobs/Training-Video-Producer-8c00852ef4eda3e4?sjdu=QwrRXKrqZ3CNX5W-O9jEva_zQmYX1KTWrms2gfeMAoj_30m7XTOlma5ahWHHlLiAnmPX2PrjwnM8srObJYDVDzKGKjTKzsGHzDz47euXnBc&tk=1crtrtf64ae4l802&vjs=3