Aerospace Glossary Letter O


OFHC – Abbreviation for oxygen-free, high conductivity copper. It has no residual deoxidant, 99.95% minimum copper content and an average annealed conductivity of 101%.
Ohm – Unit of resistance such that a constant current of one ampere produces a force of one Volt.
OSHA – Abbreviation for Occupational Safety and Health Act. Specifically the Williams-Steiger law passed in 1970 covering all factors relating to safety in places of employment.
Outgassing – Percentage of a gas released during the combustion of insulation or jacketing material.
Overlap – The amount the trailing edge laps over the leading edge of a tape wrap.