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C PROFESSIONAL PAPER February 201923
General Defects of Airplane Woods 5 BrownOak Discolorations
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air drying airplane construction airplane lumber airplane woods annual ring appear attack blue-stain boards brash brown discoloration brown heartwood Brown-rot cellulose pits chemical compression failure defects Douglas fir dried durability extend fungus grain green hardwoods heartwood 34 hickory humidity hyphse incense cedar inch incipient decay incipient stage indication infected wood injury insect kiln drying lightning ring Linn living trees logs longeron medullary rays minimum specific gravity moisture content mycelium occur particularly piled pine pith-ray flecks plane poplar prevent radial readily Red-rot reddish brown reduced in strength resin ducts result rock elm sap-stain Sapsucker wounds sapwood sawed Sitka spruce soft softwoods species specific gravity spring wood steaming streaks summer wood surface tangential temperatures timber tion TYPES OF DECAY typical decay usually weakened western hemlock western red cedar white ash white fir white oak whitish wing beam wood per annual wood-destroying fungi yellow birch yellowish