The Maritime Administration has approved in principle an application by Keyes Offshore, Ltd. V, Houston, Texas, for a Title XI guarantee to aid in financing a drilling rig.

The 180-foot by 175-foot vessel is being built by Litton Systems' Ingalls Shipbuilding Division, Pascagoula, Miss. The rig was designed for use in both exploratory and workover drilling situations, and is expected to operate in the Gulf of Mexico. The approved guarantee is for $26,490,000, or slightly less than 75 percent of the rig's $35,320,554 estimated actual cost.