COMDTINST M11000.4A

Abstract

<u>Purpose and Scope</u>. <br>This Manual defines Coast Guard policy and criteria for the preservation of towers and prescribes minimum inspection and maintenance standards for use as a guide in organizing and managing a comprehensive tower inspection and maintenance program. The primary objectives of such a program are to keep critical antenna and navigation systems operational to the maximum possible extent, and to protect the Government's investment by economically maintaining the towers. This Manual shall be utilized for all Coast Guard towers to the maximum feasible extent. Towers are defined as any permanent structure that is more vertical than horizontal, that is energized or non-energized, guyed or free standing, and exceeds 20 feet in height. Tall towers are those 300ft in height or greater. Small towers are those less than 300ft in height. The safety requirements in Chapter Two of this Manual are applicable to all towers and elevated structures including monopoles, ATON structures, and communications support structures.