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Block 7
| Question | Answer |
|---|---|
| What are the names of the four types of plywood patches? | Scarf, surface, plug, splayed |
| The surface of the wood to be glued should be smoothed using | A wood plane |
| The period of time between the application of the adhesive and the assembly of the joint is called. | Open assembly time |
| The usable life of the adhesive from the time that it is mixed until it must be spread onto the wood structure is | Pot life |
| The species of wood used by the FAA as the reference wood for aircraft structures is: | Sitka spruce |
| Wood is: | Subject to decay |
| The wood you can purchase at Home Depot is: | Unsuitable for aircraft use |
| Casein glues are considered to be: | Obsolete for all aircraft repairs |
| What type of tool would you utilize to probe a suspected area of rot? | A sharp metal tool |
| Hard knots in wood components, are acceptable: | If they are max .375: diameter |
| Solid spars may be replaced with laminated spars: | provided the material is of the same high quality. |
| Wood shrinkage is greatest in a: | Tangential direction parallel to the growth rings |
| The most common form of modified woods used in aircraft is: | Plywood |
| Obsolete adhesives include: | Urea formaldehyde, Casein |
| Epoxy adhesives are a two part synthetic resin product, and are acceptable providing they meet the requirements of | AC43.13-1b, para 1-4a |
| Prior to adhesive application, it is advisable to: | vacuum the gluing surfaces |
| roughening smooth, well planed wood surfaces before bonding is: | Not recommended |
| The period from assembly of the joint until the application of pressure is: | Closed assembly time |
| If probing with a sharp metal tool indicates a soft or mushy area the mechanic should assume the area is: | Decayed |
| A musty or moldy odor noticed when an access panel is removed is indicative of | Deterioration |
| A fungicide is added: | To the first coat of dope to protect organic fabrics from decay |
| There are two main classifications of transparent plastics. | Thermoplastic and thermosetting plastic. |
| A category of plastic material that is capable of softening or flowing when reheated is described as a | thermoplastic. |
| Two kinds of transparent thermoplastics are | Acrylic plastic and cellulose acetate plastic |
| If an aircraft's transparent plastic enclosures exhibit fine cracks which may extend in a network over or under the surface or through the plastic, the plastic is said to be | crazing. |
| When installing transparent plastic enclosures which are retained by bolts extending through the plastic material and elastic stop nuts, the stop nuts should be | tightened to a firm fit then backed off one full turn. |
| Which is considered good practice concerning the installation of acrylic plastics? | When rivets are used, adequate spacer or other satisfactory means to prevent excessive tightening of the frame to the plastic should be provided. |
| The coefficient of expansion of most plastic enclosure materials is | greater than both steel or aluminum. |
| If no scratches are visible after transparent plastic enclosure materials have been cleaned, their surfaces should be | covered with a thin coat of wax. |
| Polymerizable cement for gluing Plexiglas | Consist of a catalyst and a thick monomer-polymer syrup |
| When holes are drilled completely through Plexiglas, a | specially modified twist drill should be used. |
| Transparent plastics should be stored | In a bin tilted 10° from vertical |
| In installations involving bolts or rivets | Both of the above |
| In bolted installations use | Spacers, collars shoulders or stop nuts to prevent over tightening |
| Acrylic plastic | Can be formed to almost any shape when heated to the right temperature |
| Thermoplastics | Can be dissolved in various solvents |
| To prevent protective masking paper on a sheet of transparent plastic from deteriorating and becoming difficult to remove: | Store it out of the direct rays of the sun |
| Thermoplastics can be dissolved in various solvents | True |
| Acrylic plastic can be formed to almost any shape when heated to the right temperature | True |
| In bolted installations use Spacers, collars shoulders or stop nuts to prevent over tightening | True |
| Transparent plastics should be stored 20 deg. from veritcal | True |
| When holes are drilled completely through Plexiglas, specially modified twist drill should be used. | True |
| Plexiglass® has six to 17 times greater impact resistance than ordinary glass in thicknesses of 0.125" to 0.250* | True |
| A category of plastic material that is capable of softening or flowing when reheated is described as a | thermoplastic. |
| Which is an identifying characteristic of acrylic plastics? | Zinc chloride will have no effect. |
| If an aircraft's transparent plastic enclosures exhibit fine cracks which may extend in a network over or under the surface or through the plastic, the plastic is said to be | crazing. |
| When installing transparent plastic enclosures which are retained by bolts extending through the plastic material and elastic stop nuts, the stop nuts should be | tightened to a firm fit then backed off one full turn. |
| Which is considered good practice concerning the installation of acrylic plastics? | When rivets are used, adequate spacer or other satisfactory means to prevent excessive tightening of the frame to the plastic should be provided. |
| The coefficient of expansion of most plastic enclosure materials is | greater than both steel and aluminum. |
| If no scratches are visible after transparent plastic enclosure materials have been cleaned, their surfaces should be | covered with a thin coat of wax. |
| What is the most common method of cementing transparent plastics? | Soak Method |
| When holes are drilled completely through Plexiglas, a | specially modified twist drill should be used. |
| Metal fasteners used with carbon/graphite composite structures* | must be constructed of material such as titanium or corrosion resistant steel. |
| Sandwich panels made of metal honeycomb construction are used in high-speed aircraft because this type construction | has a high strength-to-weight ratio and greater stiffness than a single sheet. |
| (1) When performing a ring (coin tap) test on composite structures, a change in sound may be due to damage or to transition to a different internal structure. (2) The extent of separation damage in composite structures is most accurately measured by a rin | only No. 1 is true. |
| Which of these methods may be used to inspect fiberglass/honeycomb structures for entrapped water? 1. Acoustic emission monitoring. 2. X-ray. 3. Back lighting. | 1 and 2 |
| When balsa wood is used to replace a damaged honeycomb core, the plug should be cut so that * | the grain is perpendicular to the skin. |
| When repairing puncture-type damage of a metal faced laminated honeycomb panel, the edges of the doubler should be tapered* | 100 times the thickness of the metal. |
| One of the best ways to assure that a properly prepared batch of matrix resin has been achieved is to | have mixed enough for a test sample. |
| Composite inspections conducted by means of acoustic emission monitoring | pick up the "noise" of corrosion or other deterioration occurring. |
| What precaution, if any should be taken to prevent corrosion inside a repaired metal honeycomb structure?* | Prime the repair with a corrosion inhibitor and seal from the atmosphere. |
| One method of inspecting a laminated fiberglass structure that has been subiected to damage is to | strip the damaged area of all paint and shine a strong light through the structure. |
Created by:
Okenis