Sample Problems
The material specifications for a certain aircraft require that a replacement oil line be fabricated from 3/4-inch 0.072 5052-0 aluminum alloy tubing. What is the inside dimension of this tubing?
A. 0.606 inch
B. 0.688 inch
C. 0.750 inch
D. 0.886 inch
If the control stick of an aircraft with properly rigged flight controls is moved rearward and to the left, the right aileron will move
A. up and the elevator will move down
B. down and the elevator will move down
C. down and the elevator will move up
D. up and the elevator will move up
When repairing puncture type damage of a metal faced laminated honeycomb panel, the edges of the doubler should be tapered to
A. whatever is desired for a neat, clean appearance
B. 100 times the thickness of the metal
C. two times the thickness of the metal
D. minimum thickness of the metal
Which of the following materials may be inspected using the magnetic particle inspection method?
I. Magnesium alloys
II. Aluminum alloys
III. Iron alloys
IV. Copper alloys
V. Zinc alloys
A. I, II, and III
B. 1, 11, III, IV,
C. III
D. I and III and V
I. In nondestructive testing, a discontinuity may be defined as an interruption in the normal physical structure or configuration of a part.
II. A discontinuity may or may not affect the usefulness of a part.
Regarding the above statements,
A. only I is true
B. both I and II are true
C. only II is true
D. neither I nor II is true
Why is a plastic surface flushed with fresh water before it is cleaned with soap and water?
A. to prevent crazing
B. to prevent scratching
C. to prevent delamination
D. to prevent discoloration
Find the empty weight CG location for the following tricycle-gear aircraft. Each main wheel weighs 753 pounds, nosewheel weighs 22 pounds, distance between nosewheel and main wheels is 87.5 inches, nosewheel location is +9.875 inches from datum, with 1 gallon of hydraulic fluid at =-21.0 inches included in the weight scale.
A. +97.38 inches
B. +95.61 inches
C. +96.11 inches
D. +94.23 inches
The property of a material that enables it to resist penetration, wear, or cutting action or permanent distortion.
a. malleability
b. hardness
c. strength
d. ductility
The property of a metal which allows little bending or deformation without shattering.
a. Brittleness
b. ductility
c. malleability
d. strength
Property of material that will withstand tearing or shearing and may be stretched or otherwise deformed without breaking.
a. hardness
b. strength
c. resiliency
d. Toughness
The property which allows metal to be drawn, bent or twisted into various shapes without breaking.
a. brittleness
b. ductility
c. malleability
The capability of an object or material to be stretched and to recover its size and shape after its deformation.
a. plasticity
b. elasticity
c. malleability
The ability of a material to be worked into curved shapes.
a. brittleness
b. ductility
c. Malleability
Which rivets should be selected to join two sheets of 0.032-inch aluminum?
A. MS20425D-4-3
B. MS20470AD-4-4
C. MS20455DD-5-3
The ability of metal to be joined by heating and melting
A. Malleability
B. Ductility
C. Toughness
D. Fusibility
This property refers to the ability of a material to resist abrasion, penetration, cutting action, or permanent distortion.
A. Hardness
B. Fusibility
C. Strength
D. Toughness
The aluminum code number 1100 identifies what type of aluminum?
A. Aluminum alloy containing 11 percent copper.
B. Aluminum alloy containing zinc
C. 99 percent commercially pure aluminum
D. 99.11 percent aluminum.
2XXX Steel alloying agent
A. Chromium
B. Chromium Vanadium
C. Silicon Manganese
D. Nickel
Steel Alloying agent series for Chromium
A. 4XXX
B. 5XXX
C. 1XXX
D. 7XXX
Aluminum Alloying agent series for Copper
A. 4XXX
B. 8XXX
C. 1XXX
D. 2XXX
5XXX Aluminum alloying agent
A. Zinc
B. Magnesium and Silicon
C. Magnesium
D. Manganese
T4 Heat-treatment
A. Solution Heat Treated, Naturally Aged
B. Solution Heat Treated, Stabilized
C. Artificially Aged, Cold Worked
D. Solution Heat Treated, Strained Hardened
Solution Heat-Treated, Artificially Aged, Cold Worked
A. T9
B. T10
C. T8
D. T7
What load causes most rivet failures?
A. Bending
B. Longitudinal Forces
C. Compression
D. Shear
Which is an acceptable safety device for a castle nut when installed on secondary structures?
A. Star Washer
B. Cotter Pin
C. Lock Washer
D. Safety Wire
AN430 AD 4-4 Rivet has a diameter of
A. 0.125
B. 0.25
C. 0.22222222
D. 0.4
What is the purpose of countersinking rivets?
A. Increase Strength
B. Ease of installation
C. Improve airflow
D. Improve Shear Strength
AN442 Rivet head design is?
A. Countersunk
B. Universal Head
C. Flat Head
D. Brazier Head
Head Marking for 2024 alloy
A. Dimple
B. Raised Dot
C. Two Raised Dash
D. Raised Cross
Is a process wherein a piece of metal is worked at temperatures above its critical range.
A. Forging
B. Rolling
C. Pressing
D. Extrusion
Is the hardest structure obtained in steel.
A. Cementite
B. Austenite
C. Martensite
D. Eutectoid
Primary cause of intergranular corrosion is
A. Improper heat treatment
B. Dissimilar Metal contact
C. Improper application of primer
D. Impurities
Which of these materials is the most cathodic?
A. Zinc
B. 2024 Aluminum Alloy
C. Stainless Steel
D. 7075 Aluminum Alloy
Which of these materials is the most anodic?
a. Cadmium
b. Iron
c. Magnesium
d. Zinc
Which heat-treating process of metal produces a hard, wear-resistant surface over a strong, tough core?
A. Case Hardening
B. Annealing
C. Tempering
D. Normalizing
A bolt with an X inside a triangle on the head is classified as an
A. NAS Close Tolerance Bolt
B. NAS Standard Aircraft Bolt
C. AN Corrosion Resistant Bolt
D. Clevis Bolt
Normalizing is a process of heat treating
A. non-ferrous metals aside from aluminum
B. aluminum alloys only
C. ferrous metals only
D. both ferrous and non-ferrous metals
The length of time that a catalyzed resin will remain in a workable state is called the
A. Pot Life
B. Service Life
C. Shelf Life
D. Half Life
Simple composites used in aircraft are composed of?
A. Matrix + Reinforcing material
B. Hardener + Filler
C. Iron + Carbon
D. Copper + Zinc
Which of the following statements about wood decay is correct?
A. Decay that occurs before the wood is seasoned does not affect the strength of the finished piece.
B. A limited amount of certain kinds of decay is acceptable in aircraft woods since decay affects the binding between the fibers and not the fibers themselves.
C. Decay is not acceptable in any form or amount.
D. Decay is acceptable depending on the limitations set in the SRM
Which fiber to resin (percent) ratio for advanced composite wet lay-ups is generally considered the best for strength?
A. 40:60
B. 50:50
C. 30:70
D. 55:45
Kevlar and Nomex are types of.
A. glass fibre composite.
B. advanced composite.
C. aluminum alloy.
D. stainless steel.
The classification for fibreglass reinforcement material that is high resistivity and the most common is.
A. E-glass
B. S-glass
C. G-glass
D. A-glass
The classification of high tensile strength fibreglass used in aircraft structures is.
A. E-glass
B. S-glass
C. G-glass
D. A-glass
Why is it necessary to use flux in all silver soldering operations?
A. To increase heat conductivity
B. To prevent overheating of the base metal
C. To chemically clean the base metal of oxide film
D. For visual presentation purposes
After welding you would normalise to.
A. remove oxidation from the welded joint
B. remove carbon build up from the welded joint.
C. release the stresses from the material.
D. to prevent discoloration
The most important consideration(s) when selecting welding rod
A. material compatibility
B. current setting or flame temperature
C. ambient conditions.
D. thickness
A composite flap panel has structural damage. What NDT method will you use to detect?
A. High Voltage X-Ray
B. Low Voltage X-Ray
C. Coin Tap Test
D. None of these
A deep internal crack in a structural steel member is detected by.
A. fluorescent penetrant
B. x-ray or ultrasonic process method.
C. dye-penetrant
D. magnetic method
Occurs when two dissimilar metals make contact in the presence of an electrolyte
A. Filiform Corrosion
B. Intergranular Corrosion
C. Exfoliation Corrosion
D. Galvanic Corrosion
Corrosion may be caused by internal or external loading.
A. Stress Corrosion
B. Fatigue Corrosion
C. Fretting Corrosion
D. Loads Corrosion
What does not cause a corrosion?
A. Alkalis
B. Micro-Organism
C. Water
D. None of the above
Parts are rinsed thoroughly in hot water after they have been heat treated in a sodium and potassium nitrate bath to
A. prevent corrosion
B. prevent surface cracking
C. retard discoloration
Points forward of the datum point are
A. Negative
B. Neutral
C. Positive
D. all points shall be positive
The basic weight of an aircraft is.
A. the pilot, flight crew and their luggage
B. the passengers, baggage and fuel
C. the aircraft, minimum equipment
D. the aircraft and the minimum unusable fuel and oil equipment
An aircraft had an empty weight of 2,886 lb with a moment of 101,673.78 in-lb before several alterations were made. The alterations included: removing two passenger seats (45 lb) at +69”; installing a cabinet (97 lb) at 71”; installing a seat and safety belt (30 lb) at +71”; installing radio equipment (45 lb) at +94.” The alterations caused the new empty weight to move
A. 36.6 inches aft of the original empty weight CG
B. 2.81 inches aft of the original empty weight CG
C. 1.62 inches aft of the original empty weight CG
D. 1.88 inches aft of the original empty weight CG'
A 120-cm wing has a LEMAC at STA. 1000. If CG is at 40% of MAC, in what station is it located?
A. Station 952
B. Station 1012
C. Station 1040
D. Station 1048
If the CG is located at 30% of MAC and the LEMAC is at station 1010, in what station would you find the CG if the MAC is 100 inches?
A. Station 980
B. Station 1010
C. station 1040
D. Station 1400
Combination of iron and carbon
A. Cementite
B. Austenite
C. Martensite
D. Eutectoid
Steel heated above the critical range (solid solution of cementite in gamma iron)
A. Cementite
B. Austenite
C. Martensite
D. Eutectoid
Is the hardest structure obtained in steel.
A. Cementite
B. Austenite
C. Martensite
D. Eutectoid
Steel containing 0.85% Carbon.
A. Cementite
B. Austenite
C. Martensite
D. Eutectoid
—