Aviation Glossary - Compression Wood

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Compression Wood

identified by its relatively wide annual rings, usually eccentric, and its relatively large amount of summer wood, usually more than 50 percent of the width of the annual rings in which it occurs. Compression wood shrinks excessively lengthwise as compared with normal wood.

source: FAA Acceptable Methods - Aircraft Inspection and Repair (AC 43.13-1B)

A defect in wood that causes it to have a high specific gravity and the appearance of an excessive growth of summerwood. In most species, there is little difference between the color of the springwood and the summerwood. Any material containing compression wood is unsuited for aircraft structural use and must be rejected.

source: FAA Aviation Maintenance Technician Airframe Handbook (FAA-H-8083-31)

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