The FAA describes OH as "Overhauled. Describes an airframe, aircraft engine, propeller, appliance, or component part using methods, techniques, and practices acceptable to the Administrator, which has undergone the following: (1) Has been disassembled, cleaned, inspected, repaired when necessary, and reassembled to the extent possible. (2) Has been tested in accordance with approved standards and technical data, or current standards and technical data acceptable to the Administrator (i.e., manufacturer's data), which have been developed and documented by the holder of one of the following: (a) TC. (b) Supplemental Type Certificate (STC), or material, part, process, or appliance approval under section 21.305. (c) PMA."

The term OHC or overhauled condition is widely used and can be defined in many different ways depending on the sector of aviation in question. Most broadly, this terms refers to the inspection and cleaning of an electronic component (in this case) as defined by Federal Air Regulation Part 43.2. The FAA mandates that certified repair stations not only follow any prescribed overhaul procedures listed in a component's maintenance manual but also inspects and verifies that all mandatory service bulletins and subsequent airworthiness directives are complied with. In addition, when certifying a unit as &overhauled&, the repair station must verify and validate that all modifications and/or service bulletins marked on the mod chart or dataplate of the unit are indeed incorporated in the unit. Likewise, most repair stations improve cosmetics and overall appearances of unit they may be certifying as overhauled since this should be included in the cleaning and inspecting of a unit.