Airworthiness Directives; Boeing Model 747-200C and -200F Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747-200C and -200F series airplanes, that requires installation of drip shields over certain shelves in the main equipment bay. This action is necessary to prevent water from dripping through floor panels of the main deck cargo bay onto wire bundles and electronic components, which could lead to the loss of function of multiple electronic components and, consequently, could reduce the flight crew's ability to operate in adverse conditions. This action is intended to address the identified unsafe condition.