Mod 13 Unit 1 Rivets
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
1/4 inch
The dimensions of an MS20430AD-4-8 rivet are
1/8 inch in diameter and 1/2 inch long
What should be the included angle of a twist drill for hard metal
118 deg
A single-lap sheet splice is to be used to repair a section of damaged aluminum skin. If a double row of 1/8 inch rivets is used, the minimum allowable overlap will be
13/16 inch
When drilling stainless steel, the drill used should have an included angle of
140 deg and turn at a low speed
The primary alloying agent of 2024-T3 is indicated by the number
2
Which part of the 2017-T36 aluminum alloy designation indicates the primary alloying agent used in its manufacturer
2
Which rivet may be used as received without further treatment
2117-T3
How many MS20470 AD-4-6 rivets will be required to attach a 10" X 5" plate, using a single row of rivets, minimum edge distance and 4D spacing
56
What should be the included angle of a twist drill for soft metals
90 deg
MS20426AD-6-5 indicates a countersunk rivet which has
an overall length of 5/16 inch
Which is correct concerning the use of a file
apply pressure on the forward stroke, only, except when filing very soft metals such as lead or aluminum
Clad aluminum alloys are used in aircraft because they
are less subject to corrosion than uncoated aluminum alloys
The markings on the head of a dzus fastner identify the
body diameter, type of head, and length of the fastener
Shallow scratches in sheet metal may be repaired by
burnishing
Alloy 2117 rivets are heat treated
by the manufacturer and do not require heat treatment before being driven
Rivet pitch is the distance between the
centers of adjacent rivets in the same row
Rivet gauge, or transverse pitch is the distance between the
centers of rivets in adjacent rows.
A factor which determines the minimum space between rivets is the
diameter of the rivets being used
Most rivets used in aircraft construction have
dimples
Select the alternative which best describes the function of the flute section of a twist drill
forms the cutting edges of the drill point
What is indicated by a black smoky residue streaming back from some of the rivets on an aircraft
fretting corrosion is occurring between the rivets and the skin.
A rivet set used to drive MS20470 rivets should
have a slightly greater radius than the rivet head
The aluminum alloys used in aircraft construction are usually hardened by which method
heat treatment
Which statement is true regarding the inspection of a stressed skin metal wing assembly known to have been critically loaded
if genuine rivet tipping has occurred, groups of consecutive rivet heads will be tipped in the same direction
Longitudinal (fore and aft) structural members of a semi-monocoque fuselage are called
longerons and stringers
Under certain conditions, type A rivets are not used because of their
low strength characteristics
When comparing the machining techniques for stainless steel sheet material to those for aluminum alloy sheet, it is normally considered good practice to drill the stainless steel at a
lower speed with more pressure applied to the drill
Heat treated rivets D and DD series that are not driven within the prescribed time after heat treatment or removal from refrigeration
must be reheat treated before reuse
The shop head of a rivet should be
one and one-half times the diameter of the rivet shank
When an MS20470D rivet is installed, its full shear strength is obtained
only after a period of age hardening
Repairs or splices involving stringers on the lower surface of stressed skin metal wings are usually
permitted but are normally more critical in reference to strength in tension than similar repairs o the upper surface
Hole filling fasteners ( for example, MS20470 rivets) should not be used in composite structures primarily because of the
possibility of causing delamination
Aircraft structural units, such as spars, engine supports, etc., which have been built up from sheet metal, are normally
repairable using approved methods
Which of the following need not be considered when determining minimum rivet spacing
rivet length
Parts fabricated from Alclad 2024-T3 aluminum sheet stock must have all
scratches, kinks, tool marks, nicks, etc., held to a minimum
A well designed rivet joint will subject the rivets to
shear loads
The identifying marks on the heads of aluminum alloy rivets indicate the
specific alloy used in the manufacturer of the rivets
When straightening members made of 2024-T4, you should
straighten cold and reinforce
On a sheet metal fitting layout with a single bend, allow for stretching by
subtracting the setback from both legs
What is the minimum edge distance allowed for aluminum alloy single lap sheet splices containing a single row of rivets as compared to a joint with multiple rows, all rivets being equal in diameter
the minimum edge distance for the single row is equal to that for the multiple row
When repairing a small hole on a metal stressed skin, the major consideration in the design of the patch should be
the shear strength of the riveted joint
What is one of the determining factors which permits machine countersinking when flush riveting
thickness of the material is greater than the thickness of the rivet head
What is the minimum spacing for a single row of aircraft rivets
three times the diameter of the rivet shank
The general rule for finding the proper rivet diameter is
three times the thickness of the thickest sheet
What is the purpose of a gusset or gusset plate used in the construction and repair of aircraft structures
to join and reinforce intersecting structural members
What is the purpose of refrigerating 2017 and 2024 aluminum alloy rivets after heat treatment
to retard age hardening
Which procedure is correct when using a reamer to finish a drilled hole to the correct size
turn the reamer only in the cutting direction
What is the minimum edge distance for aircraft rivets
two times the diameter of the rivet shank
