AM.II.B.K5
KnowledgeAcceptable and unacceptable wood defects.
From the FAA library
- Chapter 6: Aircraft Wood & Structural Repair › Suitable Wood › Defects Not Permitted
Defects Permitted, for acceptable conditions. Figure 6-10. Selection and properties of wood for aircraft repairs. 1. Cross grain—unacceptable. 2. Wavy, curly, and interlocked grain – unacceptable. 3. Hard knots—unacceptable. 4. Pin knot clusters—unacceptable, if they produce large ... depth of a beam perpendicular to the annual rings and appear most frequently in quarter-sawed lumber. Reject wood containing this defect. 6. Pitch pockets—unacceptable. 7. Mineral streaks—unacceptable, if accompanied by decay. 8. Checks, shakes, and splits—checks…
- Chapter 6: Aircraft Wood & Structural Repair › Wood Aircraft Construction & Repairs › Inspection of Wood Structures
repairman who has had previous experience in the operation concerned to supervise that person. The ability to inspect wood structures and recognize defects (dry rot, compression failures, etc.) can be learned through experience and instruction from knowledgeable certificated mechanics ... appropriately qualified technical instructors. Inspection of Wood Structures To properly inspect an aircraft constructed or comprised of wood components, the aircraft must be dry. It should be placed in a dry, well-ventilated hangar with all inspection covers, access panels…
- Chapter 6: Aircraft Wood & Structural Repair › Inspection of Wood Structures › Wood Condition
Checking a glued joint for water penetration. As part of the inspection, examine the structure for other defects of a mechanical nature, including any location where bolts secure fittings that take load-carrying members, or where the bolts are subject ... landing or shear loads. Remove the bolts and examine the holes for elongation or surface crushing of the wood fibers. It is important to ensure the bolts are a good fit in the holes. Check for evidence of bruises…