Week 4 Wooden Structure

Question 1

Requirement for Specialized maintenance to be carried by?

Answer 1

AMO

Question 2

What reference species of wood are used in aviation?

Answer 2

Sitka Spruce

Question 3

Solid Wood requirements:

Answer 3

Must be Kiln Dried

Specific Gravity not Less than 0.36

Slope of the grain not steeper than 1 :15

MUST be quarter sawn

Question 4

Annular Rings requirements:

Answer 4

6 rings in ONE inch

Question 5

Laminated Wood

Answer 5

Consist of two or more solid wood bonded together

Stronger but less flexible and used for curved shapes (WING SPAR)

Grains parallel to each other

Question 6

Plywood

Answer 6

Constructed in veneers that are hot bonded together

Grain of veneers run at 90deg angle to each other

Grain of veneers run perpendicular to each other

Question 7

Inspection for wood

Answer 7

Decay

Splitting

Shrinkage

Bond failure

Finish Failure (usually varnish)

Damage (Hangar Rash)

Question 8

Acceptable and Ideal range of moisture

Answer 8

The acceptable moisture content of wood should be between 8% and 16%

Ideal is 10%-12%

Question 9

Things that you always ask for yourself:

Answer 9

*IS THIS SPCIALIZED MAINTENANCE ?*

*IS THIS A MINOR OR MAJOR REPAIR ?*

*DO I HAVE THE APPROPRIATE DATA ?*

Question 10

______ glue is used in very old wooden aircraft and already obsolete.

Answer 10

Casein Glue

Question 11

_____ glue is also inappropriate of modern aircraft use, as it rapidly deteriorates in hot, moist environments.

Answer 11

Plastic Resin glue

Question 12

______ glue that is highly water resistant glue that is a 2 part synthetic resin glue. Meets all FAA requirements for strength and is now the most commonly used adhesive in structural repair.

Answer 12

Resorcinol glue

Question 13

______ glue is used in the construction of plywood and is not appropriate for field use.

Answer 13

Phenol-formaldehyde Glue

Question 14

_______ glue that is very good working properties that requires less attention to joint quality. Durability is easily affected by humidity. Always follow manufacturer recommendations when using these products.

Answer 14

Epoxy Resins

Question 15

(Time period) _______ is the useable life of the glue from the time it is mixed until the time it must be used.

Answer 15

Pot life

Question 16

(Time period) ______ This is the allowable time between the application of the glue and the time the joint is assembled.

Answer 16

Open Assembly time

Question 17

(Time period)_____ is the allowable length of time between assembly of the joint and the application of clamping pressure.

Answer 17

Closed Assembly time

Question 18

(Time Period)_____ is the period of time during which the parts are being pressed together.

Answer 18

Pressing time

Question 20

Typical size for the drain holes?

Answer 20

1/4” or 0.250”