CFR › Title 14 › Part 27 › §27.68714 CFR §27.687Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Each control system spring device whose failure could cause flutter or other unsafe characteristics must be reliable.(b)Compliance with paragraph (a) of this section must be shown by tests simulating service conditions.