AMT 110 Non Metallics Exam with Solutions

Is it acceptable to substitute a piece of Douglas fir where Sitka Spruce was previously specified? - Yes, as long as the substitution is within the guidelines of the AC 43.13. What type of wooden aircraft storage ensures a long service life of the wood? - Storage in a dry, well ventilated area. What is the desirable moisture percentage range for aircraft wood? - 8-12% Is compression wood acceptable for structural repairs? - No. What structural member of a wing is typically the highest stressed member? - Spar. Can prolonged arid conditions create wood rot? - No. Aircraft plywood is manufactured with and odd number of pile? - True. Aircraft plywood is manufactured to a lower tensile strength than comparable thickness construction grade plywood to provide more flexibility necessary for aircraft wings? - False. Splicing a spar is considered to be a minor repair if the splice does not include areas under fittings or lift struts. - False. Many aircraft were manufactured with new splices in the wing spars. - True. Does aircraft wood have a limit of use in months or years? - No. Where is information found concerning acceptable species substitutions for wood materials used in aircraft repair? - AC 43.13 1B/2B. In case of elongated bolt holes in a wood spar or cracks in the vicinity of bolt holes, what must be done? - Splice a new piece or total spar replacement. A faint line running across the grain of a wood spar generally indicates what type of failure? - Compression. Is any type of decay acceptable in aircraft wood? - No. What conditions would determine acceptance of wood with mineral streaks. - It is only acceptable if rot is not present.