Skt 5 Vol 3

Front 1

(401) High strength and stiffness in composite-bonded materials is a result of the...

Back 1

concept of the cross-plied lamination

Hint 1

a. thickness of the improved matrix.
b. increased diameter of the filaments.
c. concept of the cross-plied lamination.
d. different directions of the filaments within each ply.

Front 2

(401) What is the identifying color for aramid materials?

Back 2

Yellow

Hint 2

a. Black.
b. White.
c. Yellow.
d. Translucent green.

Front 3

(401) What is a characteristic of graphite materials?

Back 3

Ultra-high stiffness

(also high tensile strength and low density qualities)

Hint 3

a. Ultra-high stiffness.
b. Low tensile strength.
c. High-density qualities.
d. Low compression strength.

Front 4

(401) Unidirectional (UD) fabrics have the highest possible structural properties in fabric composite construction as a result of having...

Back 4

straight and uncrimped fibers

Hint 4

a. straight and uncrimped fibers.
b. twisted and uncrimped fibers.
c. straight and crimped fibers.
d. twisted and crimped fibers.

Front 5

(402) What essential function does a resin matrix not perform?

Back 5

Carry the primary load of high-strength material

Hint 5

a. Carry transverse and laminar loads in the individual layers.
b. Provide the body to the composite in its cured state.
c. Carry the primary load of high-strength material.
d. Prevent the filaments from drooping.

Front 6

(402) The process where viscous materials undergo a chemical reaction to generate a rigid structure is referred to as...

Back 6

curing

Hint 6

a. curing.
b. debulking.
c. off gassing.
d. exothermic reaction.

Front 7

(402) What type of adhesive is most often used as a lightweight splice material for honeycomb core section splice repairs?

Back 7

Foam

Hint 7

a. Film.
b. Foam.
c. Liquid.
d. Laminating.

Front 8

(403) When storing advanced composite materials in cold storage, what is the maximum temperature permitted?

Back 8

0ºF

Hint 8

a. 0ºF.
b. 32ºF.
c. 60ºF.
d. 72ºF.

Front 9

(403) Cutting large batches of material into smaller sections the first time it is thawed is a process known as...

Back 9

kitting

Hint 9

a. kitting.
b. scoring.
c. bagging.
d. packaging.

Front 10

(403) Adding too much catalyst to your matrix produces what is known as a...

Back 10

hot mixture

Hint 10

a. hot mixture.
b. cold mixture.
c. slow mixture.
d. flexible mixture.

Front 11

(403) When mixing a liquid matrix, the components should be...

Back 11

blended together slowly

Hint 11

a. whipped together quickly.
b. blended together quickly.
c. whipped together slowly.
d. blended together slowly.

Front 12

(403) What must you do prior to using the triple-beam scale?

Back 12

Zero the scale

Hint 12

a. Zero the scale.
b. Adjust the platform.
c. Center each poise assembly.
d. Align the poise assemblies to the right side.

Front 13

(403) The recommended vacuum pressure, measured in inches of mercury (inHg), for curing a repair is...

Back 13

15 inHg – 28 inHg

Hint 13

a. 10 inHg – 23 inHg.
b. 15 inHg – 28 inHg.
c. 20 inHg – 33 inHg.
d. 25 inHg – 38 inHg.

Front 14

(403) Liquid moisture present in honeycomb sandwich assemblies is usually detectable by...

Back 14

x-ray

Hint 14

a. x-ray.
b. eddy current.
c. visual inspection.
d. ultrasonic inspection.

Front 15

(403) In a field environment, mitigate the effects of any moisture not removed during the drying process by using cure temperatures of or below...

Back 15

210°F

Hint 15

a. 190°F.
b. 200°F.
c. 210°F.
d. 220°F.

Front 16

(404) What kind of ply lay-up would a laminate with a ply orientation of 45°, 53°, –45°, –45°, 53°, 45° be considered?

Back 16

Angle

Hint 16

a. Cross.
b. Angle.
c. Mixed.
d. Quasi-isotropic.

Front 17

(404) What type of orientation would you choose to obtain approximately equal strength in virtually all directions when developing a ply lay-up?

Back 17

Quasi-isotropic

Hint 17

a. Cross.
b. Angle.
c. Mixed.
d. Quasi-isotropic.

Front 18

(404) What can you do to help ease the reading of the ply orientation in a graphite repair site?

Back 18

Wet sand with 400 grit sandpaper

Hint 18

a. Wet sand with 280 grit sandpaper.
b. Dry sand with 280 grit sandpaper.
c. Wet sand with 400 grit sandpaper.
d. Dry sand with 400 grit sandpaper.

Front 19

(404) The first element of patch preparation is generating a...

Back 19

patch drawing

Hint 19

a. patch drawing.
b. model drawing.
c. cutting template.
d. stacking template.

Front 20

(405) You would use a drill bushing and guide when drilling advanced composite laminates to ensure holes are drilled perpendicular to the surface and prevent...

Back 20

wobble

Hint 20

a. wobble.
b. disbond.
c. drill fatigue.
d. embrittlement.

Front 21

(405) To compensate for the stresses of flexing in flight, the minimum required panel gap is...

Back 21

0.010

Hint 21

a. 0.004.
b. 0.006.
c. 0.008.
d. 0.010.

Front 22

(406) Which work procedure do you normally perform first when making a minor repair to a laminated fiberglass panel?

Back 22

Clean the damaged area thoroughly with an approved solvent

Hint 22

a. Sand off any excessive resin.
b. Lightly sand the damaged area using 280-grit sandpaper.
c. Mix the resin according to the applicable technical order.
d. Clean the damaged area thoroughly with an approved solvent.

Front 23

(406) When making a minor repair to a laminated fiberglass panel, what is normally the third work procedure you use?

Back 23

Mix the resin according to the applicable technical order

Hint 23

a. Lightly sand the damaged area using 280-grit sandpaper.
b. Mix the resin according to the applicable technical order.
c. Clean the damaged area thoroughly with naptha.
d. Sand off any excessive resin.

Front 24

(406) What is the first step in a scarf repair?

Back 24

Remove any paint or coating

Hint 24

a. Find the center point of the damage.
b. Find the edges of the damage.
c. Remove any paint or coating.
d. Remove the top damaged ply.

Front 25

(407) When repairing a minor metal-bonded honeycomb assembly skin delamination, you can prevent core damage when drilling holes for the resin injection by using a

Back 25

drill stop

Hint 25

a. drill stop.
b. core stop.
c. hand drill.
d. core detector.

Front 26

(407) How are the thermocouples positioned when repairing a metal-bonded honeycomb repair?

Back 26

Equally spaced around the repair

Hint 26

a. Next to each other.
b. On the honeycomb.
c. Equally spaced around the repair.
d. On the top and bottom of the panel.

Front 27

(408) Low observable (LO) technology gives an aircraft the ability to defeat radar, thermal, acoustical,

Back 27

and visual detection

Hint 27

a. and x-ray detection.
b. and visual detection.
c. x-ray and visual detection.
d. and magnetic particle detection.

Front 28

(408) The main purpose of making an aircraft low observable (LO) is to increase the aircraft’s...

Back 28

survivability

Hint 28

a. performance.
b. survivability.
c. range.
d. speed.

Front 29

(409) The acronym RADAR stands for...

Back 29

radio detection and ranging

Hint 29

a. response determinate aircraft rejuvenation.
b. reactionary algorithm data response.
c. random determinant analog review.
d. radio detection and ranging.

Front 30

(410) What is radar cross section (RCS)?

Back 30

The size of an object as measured by radar

Hint 30

a. How an object sounds on radar.
b. One half of an objects signature on radar.
c. The inside signature of an object on radar.
d. The size of an object as measured by radar.

Front 31

(410) Radar cross section (RCS) is typically measured in square...

Back 31

meters

Hint 31

a. meters.
b. inches.
c. yards.
d. feet.

Front 32

(411) Condensation trails, glints, and paint schemes are sources of which radar signature?

Back 32

Visual

Hint 32

a. Visual.
b. Infrared.
c. Acoustic.
d. Electrical.

Front 33

(411) What type of aircraft signature source is generated by energy backscatter?

Back 33

Radar cross section

Hint 33

a. Numeric continuity.
b. Radar cross section.
c. Sound dispersal.
d. Sonic vibration.

Front 34

(412) What is the most important factor for radar cross section (RCS) reduction of an object?

Back 34

Shape

Hint 34

a. Speed.
b. Agility.
c. Shape.
d. Color.

Front 35

(412) Which reduction strategy uses painting an aircraft to match its primary mission?

Back 35

Visual

Hint 35

a. Visual.
b. Infrared.
c. Shaping.
d. Acoustic.

Front 36

(413) When you locate damage during an inspection, you will record length, width, depth/height, classification, and...

Back 36

orientation

Hint 36

a. grouping.
b. expansion.
c. orientation.
d. progression.

Front 37

(413) What low observable (LO) verification tier is a whole body near field measurement?

Back 37

III

Hint 37

a. 0.
b. I.
c. II.
d. III.

Front 38

(414) During a repair layout, what tool would you use to create or measure an angle?

Back 38

Protractor

Hint 38

a. Clinometer compass.
b. Inclinometer.
c. Protractor.
d. Square.

Front 39

(414) The best way to create a straight line when cutting radar absorbant material (RAM) is to use a...

Back 39

steel rule

Hint 39

a. square.
b. steel rule.
c. beveled edge.
d. rectangular straight edge.

Front 40

(415) Arranging all aircraft details so that they coincide with the outer mold line (OML) angles of the aircraft is called...

Back 40

planform alignment

Hint 40

a. freeform construction.
b. contour development.
c. planned engineering.
d. planform alignment.

Front 41

(415) What alignment shape is widely used because it allows for smaller repair areas?

Back 41

Saw-tooth

Hint 41

a. Rectangle.
b. Saw-tooth.
c. Trapezoid.
d. Parallelogram.

Front 42

(415) When developing a repair in good planform alignment, you would align your repair with the aircraft...

Back 42

butt line

Hint 42

a. empennage line.
b. fuselage line.
c. station line.
d. butt line.

Front 43

(416) What do the resistive properties of the loaded core of a radar-absorbing structure (RAS) do to the electromagnetic (EM) energy entering it?

Back 43

Weakens it

Hint 43

a. Strengthens it.
b. Replicates it.
c. Weakens it.
d. repulses it.

Front 44

(417) Dissipating an energy current over the whole surface of the aircraft is purpose of the...

Back 44

conductive layer

Hint 44

a. reactive layer.
b. recitation layer.
c. condenser layer.
d. conductive layer.

Front 45

(417) A corrosion-inhibiting primer is recommended to be used as a barrier between low observable (LO) coatings and metal structure because of...

Back 45

dissimilar metal potential

Hint 45

a. asymmetric metal potential.
b. dissimilar metal potential.
c. similar metal potential.
d. concurrent layer.

Front 46

(417) Low observable (LO) platforms use composite materials because they do not reflect radar and are...

Back 46

nonconductive

Hint 46

a. reactive.
b. conductive.
c. suppressive.
d. nonconductive.

Front 47

(417) Ceramics are used as insulation on aircraft because they do not corrode, are heat resistant, and...

Back 47

lightweight

Hint 47

a. immalleable.
b. inexpensive.
c. lightweight.
d. conductive.

Front 48

(418) A radar-absorbing materials’ (RAM) absorbency at a given frequency depends on its thickness and...

Back 48

composition

Hint 48

a. complicity.
b. composition.
c. compunction.
d. compurgation.

Front 49

(418) A dielectric radar-absorbing materials’ (RAM) performance is based on the type of dielectric material, electrical loading, and...

Back 49

thickness

Hint 49

a. thickness.
b. weight.
c. width.
d. color.

Front 50

(419) What type of sheet is an R-Card?

Back 50

Resistive

Hint 50

a. Attractive.
b. Assistive.
c. Resistive.
d. Reactive.

Front 51

(419) The R-Card is typically bonded to the radar-absorbing structure (RAS) or embedded between composite materials that are...

Back 51

radar transparent

Hint 51

a. heat sensitive.
b. radar transparent.
c. moisture absorbing.
d. electrically conductive.

Front 52

(420) What is the result of a hot sealant mixture?

Back 52

Premature bond failure

Hint 52

a. Decreased thermal protection.
b. Enhanced thermal protection.
c. Increased bond potential.
d. Premature bond failure.

Front 53

(420) What type of materials are used to provide a smooth transition between two surfaces that have a mismatched height?

Back 53

Fairing

Hint 53

a. Fading.
b. Fairing.
c. Floating.
d. Feigning.

Front 54

(421) When assessing low observable (LO) material defects, you must accurately identify width, depth/height, length, orientation, classification of damage, and...

Back 54

location

Hint 54

a. disbursement.
b. magnitude.
c. relevance.
d. location.

Front 55

(421) Extreme heat expands the radar absorbing material (RAM), breaks down the adhesive bond and causes...

Back 55

bubbles

Hint 55

a. cracks.
b. bubbles.
c. gapping.
d. uplifted edge.

Front 56

(421) Corrosion is a serious problem for stealth aircraft because low observable (LO) coatings...

Back 56

can hide the initial stages

Hint 56

a. can hide the initial stages.
b. allow contamination of other aircraft areas.
c. make it difficult to effectively measure the extent of damage.
d. are made of permeable material that permits moisture build-up.

Front 57

(421) Extensive repair is usually required on low observable (LO) materials when corrosion becomes visibly evident by showing...

Back 57

bubbles and disbonds

Hint 57

a. discoloration.
b. curling edges.
c. nicks and gouges.
d. bubbles and disbonds.

Front 58

(422) While using a pneumatic scraper to remove low observable (LO) coatings, what type of trajectory must you use to prevent delaminations in the composite structure?

Back 58

Low

Hint 58

a. Low.
b. Medium.
c. High.
d. Very high.

Front 59

(422) When using a pneumatic scraper to remove low observable (LO) coatings around the edge of a panel, the direction you should scrape is from an...

Back 59

interior point and work out toward the edges

Hint 59

a. edge and work towards an interior point.
b. edge and work across to the opposite edge.
c. interior point and work out toward the edges.
d. interior point and work further to a more inward point.

Front 60

(422) What tool do you use to remove filler material from gaps and seams on low observable (LO) aircraft?

Back 60

Nonmetallic pick

Hint 60

a. Metallic scribe.
b. Sanding block.
c. Nonmetallic pick.
d. Pneumatic scraper.

Front 61

(422) In order to safeguard the sensitivity of the material when discarding excess radar-absorbing material (RAM), you may have to use disposal equipment such as industrial shredders, hand-held cutting devices, and...

Back 61

incinerators

Hint 61

a. grinders.
b. scrapers.
c. band saws.
d. incinerators.

Front 62

(423) The term that describes the systematic removal of low observable (LO) coatings in a way that ensures a smooth transition between layers is...

Back 62

racetracking

Hint 62

a. racetracking.
b. gap picking.
c. stack up.
d. fairing.

Front 63

(423) Transitioning between an original coating and a new coating by overlapping alternating paints is called...

Back 63

tie-in

Hint 63

a. racetracking.
b. stack up.
c. fairing.
d. tie-in.

Front 64

(423) You should incorporate larger than minimum dimensions during your removal layout to allow for...

Back 64

sanding imperfections

Hint 64

a. composite repairs.
b. planform alignment.
c. sanding imperfections.
d. excess material removal.

Front 65

(423) Sanding a coating layer until the layer below is visible is called a burn...

Back 65

through

Front 66

(423) What can occur if the conductive elements of a coating are left exposed and unprotected for an extended period of time in a hot and humid environment?

Back 66

Oxidation

Hint 66

a. Cross contamination.
b. Delamination.
c. Oxidation.
d. Distortion.

Front 67

(424) What determines the aircraft surface temperature that must be maintained for a specific material application?

Back 67

Manufacturer’s instructions

Hint 67

a. Location of the coating.
b. Manufacturer’s instructions.
c. General coating system technical order.
d. Weapon system specific technical order.

Front 68

(424) The solvent wipe cleaning step for composite materials may be omitted...

Back 68

when authorized by aircraft technical data

Hint 68

a. after the defects on the radar absorbent material (RAM) have been repaired.
b. when the primer has been mixed to the manufacturer’s specifications.
c. after scuff sanding and coatings have been properly applied.
d. when authorized by aircraft technical data.

Front 69

(424) To ensure that flex primer will adhere to the surface of radar-absorbing material (RAM), scuff sand the surface of the RAM with...

Back 69

medium-to-fine grade sandpaper

Hint 69

a. coarse-grade sandpaper.
b. coarse-grade steel wool.
c. medium-to-fine grade sandpaper.
d. medium-to-fine grade steel wool.

Front 70

(425) What material is used for its adhesion-improving and corrosion-inhibiting properties?

Back 70

Primer

Hint 70

a. Paint.
b. Primer.
c. Kapton.
d. Indium Tin Oxide.

Front 71

(425) The exterior finish of the aircraft minimizes the moisture intrusion and provides ultraviolet protection for...

Back 71

resins and materials

Hint 71

a. mechanical systems.
b. resins and materials.
c. metallic structures.
d. electrical systems.

Front 72

(425) The most effective roller covers for the application of primer are made from...

Back 72

ultrahigh-density foam

Hint 72

a. lint free, extra density, high quality soft woven fabric.
b. high quality, medium-density bleached cotton.
c. super-dense natural sponge.
d. ultrahigh-density foam.

Front 73

(426) When applying sheet-type radar-absorbing material (RAM), you must consider surface area, shape, available equipment, and...

Back 73

contour

Hint 73

a. caster.
b. camber.
c. contour.
d. composition.

Front 74

(426) When applying radar-absorbing material (RAM) with pressure-sensitive adhesive (PSA), you roll it down with a rubber-wheeled roller to...

Back 74

remove air bubbles

Hint 74

a. remove air bubbles.
b. improve aerodynamics.
c. reduce the material thickness.
d. decrease electrical discontinuities.

Front 75

(427) How can you prevent moisture and condensation from degrading the performance of filler material that has been removed from cold storage?

Back 75

Allow the material to acclimate in the sealed manufacturers’ containers

Hint 75

a. Open the manufacturers’ containers and mix the components immediately.
b. Allow the material to acclimate in the sealed manufacturers’ containers.
c. Open the manufacturers’ containers and use the material immediately.
d. Allow the material to acclimate in work center mixing containers.

Front 76

(427) Zip cords are installed around some panels to aid in gap filler...

Back 76

removal

Hint 76

a. removal.
b. restoration.
c. application.
d. identification.

Front 77

(427) The most effective way to apply primer to panel seams during small repairs is to use a/an...

Back 77

fantail artist brush

Hint 77

a. roller.
b. airbrush.
c. fantail artist brush.
d. high volume/low pressure (HVLP) spray unit.

Front 78

(428) When a repair requires uniform pressure across the bonded surface, you will use a...

Back 78

contact vacuum bag system

Hint 78

a. portable compressed hot air system.
b. heated noncontact bagging system.
c. noncontact vacuum bag system.
d. contact vacuum bag system.

Front 79

(429) An inspection without the aid of diagnostic equipment of the procedures being performed is a/an...

Back 79

visual process verification

Hint 79

a. tactile process verification.
b. visual process verification.
c. conductivity process check.
d. aerodynamic process check.

Front 80

(429) Mechanical verification of aerodynamic smoothness can be accomplished through the use of feeler gauges, pit depth gauges, and...

Back 80

optical tools

Hint 80

a. multimeters.
b. optical tools.
c. glossimeters.
d. sonic comparators.