Term
| Why should a micrometer be calibrated? |
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Definition
| Continually sliding objects between the anvil and spindle may wear the surfaces |
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Term
| What should be used to make a visual inspection |
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Definition
| A magnifying glass and a borescope |
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Term
| What precision measuring instruments are used to measure outside dimensions? |
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Definition
| Outside micrometer calipers and vernier calipers |
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Term
| What are the undesirable characteristics of a cold weld? |
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Definition
| Improper penetration with rough and irregular cold laps not feathered into the base metal |
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Term
| What is the code system used by aluminum rivet and steel bolt manufacturers to identify AN standard parts? |
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Definition
| AN bolts can be identified by the code markings on the bolt heads. Aluminum rivets can be identified by the markings on the rivet head |
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Term
| What is the procedure for performing penetrant inspection? |
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Definition
Clean the surface, apply penetrant Remove the penetrant with emulsifier or cleanser
Dry the part, apply developer
Inspect and interpret results according to manufactures instructions |
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Term
| What are the principles of penetrant inspections? |
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Definition
| This type of inspection depends upon a penetrating liquid entering the surface opening and remaining in that opening |
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Term
| What non-destructive testing methods could be used for detecting surface cracks in aluminum fittings? |
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Definition
Dye penetrant
Radiography
Eddy current
Ultrasonic testing and Visual inspection |
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Term
| How can the correct torque for a bolt be determined? |
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Definition
| A standard torque table should be used as a guide in tightening nuts, bolts and screws whenever specific torque values are not called out in the manufacturer's procedures |
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Term
| How can the correct grip length for a bolt be determined? |
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Definition
| By measuring the thickness of the material with a hook scale inserted through the hole |
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Term
| What may be accomplished to prevent aluminum alloy rivets from becoming hard after the quenching sequence? |
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Definition
| By refrigerating at a temperature below 32 degrees F |
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Term
| What is the general rule for the use of self-locking nuts? |
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Definition
| They may be used on certificated aircraft subject to the restrictions of the manufacturer. They are not used on joints which subject either the nut or bolt to rotation or that will shake loose under severe vibration |
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Term
| What is the difference between a general purpose bolt and a close tolerance bolt? |
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Definition
| Close tolerance bolts are machined more accurately than general purpose bolts |
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Term
| What type of cable is commonly used in primary control systems. |
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Definition
| Extra flexible 7 x 19 carbon or stainless steel cable |
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Term
| What is strain hardening? |
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Definition
| Cold working of metal performed at temperatures below the critical range |
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Term
| What width should a welding bead have and what should be the depth of penetration in a butt weld? |
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Definition
| The bead width should be 3 to 5 times the thickness of the base metal and 100 percent penetration for a butt weld |
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Term
| What occurs during the preparation stages when penetrant inspection liquid is applied to, and then removed from a part that is cracked? |
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Definition
| The penetrating liquid enters the crack and remains there in order to make the crack visible after developer is applied |
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Term
| How are AN standard steel bolts be identified? |
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Definition
| AN bolts can be identified by the code markings on the bolt heads |
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Term
| What are the penetration requirements for a fillet weld? |
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Definition
| 25 to 50 percent of the thickness of the base metal |
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Term
| Why is alloy steel that is responsive to heat treatment usually less suitable for welding? |
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Definition
| Because of its tendency to become brittle and lose its ductility in the welded area |
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Term
| Name one advantage of using pre-impregnated (prepreg) materials (over non-prepreg materials) in the construction or repair of composite components (besides saving time). |
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Definition
| Prepreg fabric contains the proper amount of matrix |
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Term
| Name one material commonly used as the reinforcing component in structural composite laminates. |
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Definition
Fiberglass
Aramid
Kevlar
Graphite or carbon fiber |
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Term
| What are some of the purposes for which thermoplastic and thermosetting resins are commonly used in modern aircraft? |
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Definition
| Plexiglas is commonly used for windshields and side windows. Thermosetting resins are commonly used as the matrix material in composites |
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