QUADER - An old Scots word literally meaning “to make something square,” but which can also be used figuratively to mean “to agree with or get along with someone.”
Airworthiness Directive - When an unsafe condition exists with an aircraft, the FAA issues an Airworthiness Directive (AD) to notify concerned parties of the condition and to describe the appropriate corrective action.
Pressure altitude corrected for nonstandard temperature variations. As temperature and altitude increase, air density decreases. In a sense, it's the altitude at which the airplane "feels" its flying.
