Quiz 3 FAA

8135. A rivet set used to drive MS20470 rivets should A— have the same radius as the rivet head. B—have a slightly greater radius than the rivet head. C—be nearly flat on the end, with a slight radius on the edge to prevent damage to the sheet being riveted.

B- The rivet set used to drive AN470 or MS20470 universal head rivets should have a radius slightly larger than the radius of the rivet head. This larger radius allows the mering action of the rivet gun to be directly on the of the rivet.

(8044)-The general rule for finding the proper rivet diameter is? a. three times the thickness of the materials to be joined b. two times the rivet length c. three times the thickness of the thickest sheet

C

(8107)-Which statement is true regarding the inspection of a stressed skin metal wing assembly known to have been critically loaded? a. if rivets show no visible distortion, further investigation is unnecessary b. if bearing failure has occurred, the rivet shanks will be joggled. c. if genuine rivet tipping has occurred, groups of consecutive rivet heads will be tipped in the same direction

C

(8129)-What is indicated by a black 'smoky' residue streaming back from some of the rivets on an aircraft? a. Filiform corrosion is occurring between the rivets and the skin b. intergranular corrosion is occurring between the rivets and the skin c. fretting corrosion is occurring between the rivets and the skin

C

8152. Joggles in removed rivet shanks would indicate partial A- bearing failure. B-torsion failure. C-shear failure

C - A joggle (offset) in the shank of a rivet that has been removed from a damaged aircraft structure indicates that the rivet joint has failed in shear (shear failure).

8142. MS20426AD-6-5 indicates a countersunk rivet which has A-a shank length of 5/16 inch (excluding head). B-a shank length of 5/32 inch (excluding head). C-an overall length of 5/16 inch.

C - An MS20426AD-6-5 rivet is a countersunk-head rivet made of 2117 aluminum alloy. It has a diameter of 6/32 inch (3/16 inch) and an overall length, including the head, of 5/16 inch.

8148. A DD rivet is heat treated before use to 3 A-harden and increase strength. B— relieve internal C-soften to facilitate riveting.

C - DD, or 2024-T, rivets are heat-treated before they are driven to soften them so they will not split when they driven.

8146. A sheet metal repair is to be made using two pieces of 0.0625-inch aluminum riveted together. All rivet holes are drilled for 1/8-inch rivets. The length of the rivets be used will be A- 5/32 inch. B-3/16 inch. C-5/16 inch.

C - Each of the two sheets of material to be riveted together has a thickness of 0.0625 inch. The total thickness of the material is 0.125 inch, and the 1/8-inch rivets should extend through the material for 1-1/2 diameters, which is 0.1875 inch. The total length of the rivet must be 0.3125 inch, which is 5/16 inch.

8155. Which rivet is used for riveting nickel-steel alloys? A—2024 aluminum. B-Mild steel. C—Monel.

C - Monel rivets are used for riveting nickel-steel alloys.

8144. (Refer to Figure 3.) Which is the grip length of the flush rivet? A-1. B-2. С-3.

C - The grip length of a rivet is the total thickness of the material held together by the rivet. In this question, the grip length is dimension 3

8130. The identifying marks on the heads of aluminum alloy rivets indicate the A— degree of dimensional and process control observed during manufacture. B-head shape, shank size, material used, and specifications adhered to during manufacture. C-specific alloy used in the manufacture of the rivets

C - The identifying mark on the head of an aluminum rivet indicates the specific alloy used in the manufacture of the rivet.

8147. Mild steel rivets are used for riveting A-nickel-steel parts. B-magnesium parts. C-steel parts

C- Mild steel rivets are used for joining steel parts.

8133. What is the purpose of refrigerating 2017 and 2024 aluminum alloy rivets after heat treatment? A- To accelerate age hardening. B— To relieve internal stresses. C-To retard age hardening.

2017 and 2024 aluminum alloy rivets must be heat treated before they are driven. Immediately after they are quenched, they should be stored in a subfreezing refrigerator. Storing the rivets at the cold temperature retards their aging process and allows time to elapse between their heat treatment and their being driven.

(8045)-The shop head of a rivet should be? a. one and one-half times the diameter of the rivet shank b. one-half times the diameter of the rivet shank c. one and one-half times the diameter of the manufactured head of the rivet.

A

(8138)-The primary alloying agent of 2024-T3 is indicated by the number? a. 2 b. 20 c. 24

A

(8139)-Which part of the 2017-T36 aluminum alloy designation indicates the primary alloying agent used in its manufacture? a. 2 b. 17 c. 20

A

8153. What type loads cause the most rivet failures? A-Shear. B - bearing C-Head

A - A shear load, which causes most rivet failures, is one that tries to cut a rivet by shearing it. Rivets are designed to be used in joints loaded in shear only.

8043. Alloy 2117 rivets are heat treated A— by the manufacturer and do not require heat treatment before being driven. B— by the manufacturer but require reheat treatment before being driven. C—to a temperature of 910 to 930°F and quenched in cold water.

A - Alloy 2117 rivets, which are called AD rivets, are heat-treated by the manufacturer. They do not require any further heat treatment before they are driven.

8131. When an MS20470D rivet is installed, its full shear strength is obtained A— only after a period of age hardening. B- by the cold working of the rivet metal in forming a shop head. C— by heat treating just prior to being driven

A - An MS20470D rivet is an "icebox" rivet, and it must be heat-treated before it is driven. After it is removed from the quench bath, it is stored in a subfreezing refrigerator to keep it soft until it is ready to be driven. After it is driven, it age hardens. It regains approximately half of its strength in one hour and its full strength in four days

8136. Heat-treated rivets in the D and DD series that are not driven within the prescribed time after heat treatment or removal from refrigeration A - must be reheat treated before use. B— must be discarded. C-may be returned to refrigeration and used later without reheat treatment.

A - Heat-treated rivets of the D or DD series that are not driven within the prescribed time after heat treatment, or which have been removed from refrigeration, must be heat-treated again before they are used. There is no specified number of times they may be reheat-treated.

8052. Hole filling fasteners (for example, MS20470 rivets) should not be used in composite structures primarily because of the A— possibility of causing delamination. B— increased possibility of fretting corrosion in the fastener. C— difficulty in forming a proper shop head

A - Hole filling fasteners such as conventional rivets should not be used in composite structures because of the probability of causing delamination. When a conventional rivet is driven, its shank expands to completely fill the hole. The force applied by the expanded shank will cause the material to delaminate around the edges of the hole.

8108. What is the minimum edge distance for aircraft rivets? A- Two times the diameter of the rivet shank. B— Two times the diameter of the rivet head. C- Three times the diameter of the rivet shank.

A - The minimum edge distance for aircraft rivets (the distance between the center of the rivet hole and the edge of the sheet) is twice the diameter of the rivet shank.

8141. Most rivets used in aircraft construction have A— dimples. B-smooth heads without markings. C—a raised dot.

A- Most rivets used in aircraft construction and repair are made of aluminum alloy 2117. 2117 rivets are identified by a dimple in the center of the manufactured head.

8138-1. Which part of 2017-36 aluminum alloy indicates the temper designation? A- T36. B-2 C—17.

A- To provide a visual means for identifying the various grades of aluminum and aluminum alloys, aluminum is usually marked with symbols such as a government specification number, the temper or condition furnished, or the commercial code marking. The commercial code marking consists of a num ber that identifies the particular composition of the alloy. Additionally, letter suffixes designate the basic temper designations and subdivisions of aluminum alloys.

8134. Under certain conditions, type A rivets are not used because of their A-low strength characteristics. 14" B— unique design that causes crazing or cracking. C-tendency toward embrittlement when subjected to vibration.

A- Type A rivets (commercially pure aluminum rivets) are not used for aircraft structural repair because of their lowstrength characteristics

(8127)-Rivet pitch is the distance between the? a. centers of rivets in adjacent rows b. centers of adjacent rivets in the same row c. heads of rivets in the same row

B

8143. Which rivet may be used as received without further treatment? A- 2024-4. В—2117-Т3. С-2017-Т3.

B - A 2117 rivet is known as an AD rivet. It may be driven as received, without further heat treatment

8041. A well-designed rivet joint will subject the rivets to A— compressive loads. B-shear loads. C-tension loads.

B - A properly designed rivet joint has the major part of the load in the rivets as a shear load.

8053. Metal fasteners used with carbon/graphite composite structures A— may be constructed of any of the metals commonly used in aircraft fasteners. B-must be constructed of material such as titanium or corrosion resistant steel. C-must be constructed of high strength aluminum-lithium alloy.

B - One of the problems with carbon/graphite as a structural material is the fact that aluminum alloys in contact with it will corrode. For this reason fasteners used with carbon/ graphite must be made of a corrosion-resistant material such as titanium or corrosion-resistant steel.

149. When riveting dissimilar metals together, what cautions must be taken to prevent an electrolytic action? A— Treat the surfaces to be riveted together with a process called anodic treatment. B-Place a protective separator between areas of potential electrical difference. C-Avoid the use of dissimilar metals by redesigning the unit according to the recommendations outlined in AC 43.13-1A.

B - One precaution to be observed when riveting together dissimilar metals is to place a nonconductive separator between the two surfaces. This separator prevents the migration of electrons between the areas of electrode potential difference

8121. A factor which determines the minimum space between rivets is the A-length of the rivets being used. B-diameter of the rivets being used. C-thickness of the material being riveted

B - Rivet spacing is based on the diameter of the rivet shank It is expressed in terms of rivet diameters.

8137. The dimensions of an MS20430AD-4-8 rivet are A- 1/8 inch in diameter and 1/4 inch long. B—1/8 inch in diameter and 1/2 inch long. C—4/16 inch in diameter and 8/32 inch long.

B - The first dash number in the rivet identification gives the rivet diameter in 1/32-inch increments. The second dash number gives the rivet length in 1/16-inch increments. An MS20430AD-4-8 rivet is 4/32 inch (1/8 inch) in diameter and 8/16 inch (1/2 inch) long

8132. Which of the following need not be considered when determining minimum rivet spacing? A-Rivet diameter B-Rivet length. C-Type of material being riveted

B - The length of the rivet does not enter into the determination of the minimum rivet spacing. The rivet diameter and the type and thickness of the material do determine rivet spacing.

8150. The length of a rivet to be used to join a sheet of .032-inch and .064-inch aluminum alloy should be equal to A—two times the rivet diameter plus .064 inch. B—one and one-half times the rivet diameter plus .096 inch. C-three times the rivet diameter plus .096 inch.

B - The rivet length used to join two sheets of metal should be equal to the total thickness of the metal being joined, plus 1-1/2 times the diameter of the rivet. The total thickness of the material being joined is 0.096 inch. The length of the rivet should be 1-1/2 times the rivet diameter 0.096 inch.

8156. The length of rivet to be chosen when making a structural repair that involves the joining of 0.032-inch and 0.064-inch aluminum sheet, drilled with a No. 30 drill, is A— 7/16 inch. B—5/16 inch. C—1/4 inch.

B - The two sheets of material to be riveted together have a total thickness of 0.096 inch. The rivet installed in a No. 30 hole is a 1/8-inch rivet. It should extend through the material a distance of 0.1875 inch. The total length of the rivet must be 0.096 + 0.1875 = 0.2835. The nearest standard rivet length to this is 5/16 inch (0.3125 inch).

154. Which rivet is used for riveting magnesium alloy structures? A-Mild steel. B-5056 aluminum. C-Monel.

B - To prevent corrosion in a magnesium structure, 5056 aluminum alloy rivets should be used. Magnesium is the chief alloying agent in 5056 aluminum alloy.

8151. What is generally the best procedure to use when removing a solid shank rivet? A- Drill through the manufactured head and shank with a shank size drill and remove the rivet with a punch. B— Drill to the base of the manufactured rivet head with a drill one size smaller than the rivet shank and remove the rivet with a punch. C— Drill through the manufactured head and shank with a drill one size smaller than the rivet and remove the rivet with a punch.

B - When removing a solid shank rivet from a piece of aircraft structure, drill to the base of the manufactured head with a drill one size smaller than the rivet shank. insert a pin punch into the hole and pry the head oft, then use the pin punch to drive the rivet shank from the skin.

8145. Which rivets should be selected to join two sheets of .032-inch aluminum? A-MS20425D-4-3. B-MS20470AD-4-4. C-MS20455DD-5-3.

B- The two pieces of material to be joined have a total thickness of 0.064 inch. The rivet used with this metal should have a diameter of about three times the thickness of the thickest sheet. This would cause us to choose a rivet with a diameter of 3 x 0.032 inch, or 0.096 inch. The closest rivet to this is one with a diameter of 1/8 inch (0.125 inch). A 1/8-inch rivet should extend through the material for 3/16 inch, or 0.1875 inch. The total length of the rivet must be 0.064 + 0.1875, or 0.2515 inch. We would choose an MS20470AD-4-4 rivet. This is a universal head rivet, 1/8 inch in diameter and 1/4 inch long

8140. A sheet metal repair is to be made using two pieces of 0.040-inch aluminum riveted together. All rivet holes are drilled for 3/32-inch rivets. The length of the rivets to be used will be A- 1/8 inch. B-1/4 inch. C-5/16 inch.

B- This problem calls for joining two pieces of 0.040-inch material, using 3/32-inch rivets. The total thickness of the material is 0.080 inch. The rivet should protrude through the material for 1-1/2 diameters, or 0.1406 inch (9/64 inch). The total length of the rivet must be 0.080 + 0.1406, or 0.2206 inch. The nearest standard rivet to this length is 1/4 inch long (0.250 inch)