preservation and maintenance of wooden structures Flashcards
what are the main protective measures to maintain wooden aircraft structures?
they should be kept clean by wiping with a soft, damp cloth, followed by a dry cloth, a good quality furniture spray or polish should then be applied.
Why should wooden aircraft be kept in well-ventilated hangars?
To prevent moisture condensation inside the structure, which can cause the wood to deteriorate.
What can happen if ventilation holes in wooden aircraft become obstructed?
Obstruction of ventilation holes can cause moisture to condense inside the structure, leading to wood deterioration.
What are the main causes of wood damage in aircraft?
Moisture, temperature, and sunlight are the main causes of wood damage, leading to mildew, rot, or deterioration from fungi, insects, or marine borers.
How do chemical preservatives protect wooden aircraft structures?
They protect against decay fungi, harmful insects, and marine borers by penetrating and retaining chemicals in the wood, which increases its lifespan
What qualities must wood preservatives possess for use on aircraft structures?
They must be toxic to fungi, pests, and marine organisms, free from objectionable properties, possess permanence, and should not be corrosive.
Why is surface finish important for wooden aircraft structures?
The surface finish is the final line of defense against moisture entry, protecting the structure from damage.
What is the primary objective of interior finishes on wooden aircraft structures?
To protect the wood from changes in moisture content when exposed to damp air, condensation, or water penetration.
Why must end grain surfaces of wooden members be sealed thoroughly?
End grain surfaces are more absorbent and vulnerable to moisture entry, requiring thorough sealing to prevent deterioration.
What is the primary purpose of exterior finishes on wooden aircraft structures?
To protect the wood from weathering, provide a suitable appearance, and ensure a smooth surface during flight.
What precautions must be taken when applying finishes to repaired wooden aircraft parts?
Excess adhesive must be removed, surfaces cleaned of oil, grease, sawdust, and shavings, and all contaminants must be eliminated before applying the finish.
How should interior surfaces of wooden aircraft be finished?
Apply one thinned coat of varnish or acceptable finish for penetration, followed by two full coats. Protect closed structures similarly.
How should bolt holes in wooden aircraft structures be sealed?
Bolt holes should be sealed with varnish or an acceptable sealer and allowed to dry or cure thoroughly before bolt installation to prevent moisture entry and corrosion.
How do the color and finish of wooden aircraft surfaces affect their durability?
Dark colors can cause high temperatures (up to 85°C), weakening the wood and finishes, while lighter colors maintain lower temperatures and reduce deterioration risk.
Why is it necessary to consider temperature effects when finishing wooden aircraft?
High temperatures can weaken the wood, adhesives, and finishes, reducing the structural integrity and lifespan of the aircraft.
