Aviation Mechanic Terms
Terms
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- Malleability
- Ability to be hammered, molded, or shaped without cracking or breaking.
- Ductility
- Ability to be bent permanently or twisted into various shapes without breaking.
- Fusibility
- Ability to become a liquid when heated.
- Thermosetting plastic
- achieves rigidity through chemical reaction. cannot be reheated
- Thermoplastic
- can be machined and will soften with heat. physical rather than chemical change takes place. made of stretched acrylic; laminated 2 sheets and a rubber inner layer.
- Tinner Snips
- cuts straight lines in metal 1/16" thick
- Aviation Snips
-
Red-right handed
Green-left handed
Yellow-cuts straight
metal no thicker than .050" - Hacksaws
- cuts metal too thick for snips. blades measured in teeth per inch.
- Types of composite fibers
-
carbon graphite fibers
boron fibers
DuPont aramid kevlar
Aramid Nomex - Radome Grade A
- Primary radome grade. Damage could seriously affect aircraft, crew, antenna, etc. All Navy radomes are Class 1.
- Radome Grade B
- Secondary radome grade. Damage would not seriously affect mission, aircraft, safety, etc. All Navy radomes are Class 1.
- Composite Matrix materials
-
Epoxy Resins
Bismaleimide Resins
PMR Polyamide Resins - What are 3 general methods of radome construction?
- Honeycomb, Solid Laminate, Filament Wound
- In preparation of repair what should first be done to surface?
- Contaminate removal and removal of surface coatings.
- Authorized cleaning of aircraft can be found in what manual?
- NA-01-509
- What publication to consult on proper number of plies to be removed from radome?
- Consult the applicable MIM
- Two most common resin selections for radomes on Naval aircraft.
- Polyester & Epoxy Resin
- What does advance composite materials allow?
- Allows replacement of aluminum. Higher strength-to-weight ratio. Aircraft carry larger payloads and save fuel.
- What are the 2 types of thermoplastic materials?
- Stretched acrylic & Laminated.
- What publication is used to find screw torquing limits & procedures?
- The applicable MIM.
- What are characteristics of HARDNESS?
- Ability to resist abrasions, penetrations & distortion.
- What does the second number indicate in an aluminum alloy designation code?
- Any added element.
- 4 Special views of orthographic drawing.
- Auxiliary views, Sectional views, Phantom views, & Exploded views.
- Purpose of a flat pattern layout.
- used as a guide or pattern to indicate where to bend or cut metal.
- What is a prick punch used for?
- to make reference marks.
- What is a center punch used for?
- mark locations for drilling, prevents drill from wandering.
- Radome Damage Class 1
- damage to paint or coating only.
- Radome Damage Class 2
- damage not deeper than 2nd ply.
- Radome Damage Class 3
- damage to outer skin only but core is undamaged.
- Radome Damage Class 4
- damage does not exceed 1/2 wall thickness in class "A" radome. does not apply to class "B".
- Radome Damage Class 5
- hole through wall in "A", "B". skin, core & inner skin damaged in "C". damage beyond 3rd layer in class "D".
- What is purpose of a cut line?
- Indicates exact amount of metal required to make a part.
- Define Bend Tangent Line
- indicates beginning and end of a bend.
- Define Setback
- distance from bend tangent line to the mold point.
- Where is the mold point located?
- At the intersection of extension lines outside the formed part.
- two types of twist drill bits
- general purpose and carbide-tipped.
- what is the drill angle?
- the degree of drop from center to the outer edge (59 degrees)
- What portion of a drill bit is inserted into the chuck?
- The shank.
- What is the purpose of a hand drill?
- To drill 1/4" or smaller holes.
- What is the purpose of a pneumatic drill?
- Used for drilling series of large holes where speed and accuracy are required.
- What is the purpose of a drill press?
- To do heavy duty and sensitive drilling.
- Purpose of a riveted joint layout?
- Good layout ensures each rivet carries the share of the required load.
- What is formula for transverse pitch?
- 75% of existing rivet pitch.
- What are types of machine countersinks?
- Non-adjustable and adjustable.
- What will selection of a machine countersink depend on?
- Availability
- What will cause chattering when countersinking?
- Dull countersinks.
- What does improper depth cause when countersinking?
- Weak joints and elongated holes.
- What is dimple countersinking?
- Forming cone-shaped recesses by pressing sheet metal between male and female die.
- What is the purpose of dimple countersinking.
- Makes a recess shape to accomodate a flush head fastener without removing much metal. Produces a stronger joint than machine countersinking.
- What does dimple countersinking produce?
- Produces a stronger joint than machine countersinking.
- What is the purpose of press dimpling?
- Dimpling soft alloys & metal .063" or thinner.
- What is the difference between press dimpling and coin dimpling?
- A coin dimpler has a spring loaded ram.
- What does coin dimpling reduce?
- Circumferential cracks.
- Why are holes drilled one size smaller than rivets during dimple construction?
- Dimpling stretches the holes.
- When is combination method used?
- When one metal is too thick to be dimpled and the other is too thin to be machine countersunk.
- List 5 permanent fasteners
-
Rivet solid shank
Blind rivets
Hi-Shear rivets
Jo-Bolts
Hi-Lok fasteners - What size range do Cleco fasteners go from?
- 1/16" to 3/8"
- What is the advantage of an aluminum alloy?
- They have a high strength-to-weight ratio.
- what is a bar folder used for?
- for making bends or folds along edges of sheets of metal. no bend wider than 1" can be made on them.
- what is a box and pan brake for?
- for making boxes and pans of various sizes and shapes.
- what are flanging dies used for?
- used to form a bend or flange in the center of a sheet of metal without distortion such as lightening holes or beads in the center of a rib or bulkhead.
- what are the sizes of twist drill bits available?
-
inches - 1/16" to 4+"
letters - A to Z (A is smallest)
numbers 80 to 1 (80 is smallest) - what is the most important step in the care of all drills and drill bits
- keep them free of corrosion.
- what are the two types of solid shank rivets?
-
countersunk head
raised head - what alloy is a raised cross rivet made of?
- 5056 (magnesium alloy)
- what are the 2 types of blind rivets?
-
mechanical lock
friction lock - what do the locks do in blind rivets?
- they hold the stem in place.
- what measurements are Jo-Bolts available in?
- 1/16"