The Boeing Company

William Ryan Harrigan

Robert A DiChiara

MaryAnn S Muench

Kevin R Lenihan

Myles A Rohrlick

Anibal J Garcia

Thomas Reiner

Michael Patterson Johnson

Provided are stacks including CMC structures and capping layers deposited on surfaces of these CMC structures. Also provided are methods for hermetically sealing the surfaces of the CMC structures with the capping layers. These stacks may be used to construct walls of radomes that enclose antennas and other equipment of aerospace vehicles. The capping layers may form smooth external surfaces of the radomes and may hermetically seal the underlying CMC structures. The dielectric properties of these stacks may be configured to minimize interference with operations of the antennas and other equipment deposited within the radome.

Stacks having hermetic capping layers over porous ceramic matrix composite structures

Provided are methods for hermetically sealing the surfaces of the CMC structures with the capping layers, comprising depositing a slurry onto the surface of a CMC structure and treating the CMC structure with the deposited slurry in an oxygen containing environment, thereby forming a stack. These stacks may be used to construct walls of radomes that enclose antennas and other equipment of aerospace vehicles. The capping layers may form smooth external surfaces of the radomes and may hermetically seal the underlying CMC structures. The dielectric properties of these stacks may be configured to minimize interference with operations of the antennas and other equipment deposited within the radome.

A cargo restraint system is provided. The system includes a fixed-hook assembly including a frame and a hook extending from the frame. The system also includes a fabric strap including a first end and a second end and a tensioner assembly configured to receive and maintain the second end of the fabric strap therein when in a locked configuration, wherein the tensioner assembly is configured to reduce in length when placed in the locked configuration. At least a portion of the fabric strap is received within the fixed-hook assembly.

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Hacienda Heights, CA, United States of America

William Ryan Harrigan