M1: Aircraft Metal Structure Repair
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
Select the preferred drawing for proper countersinking.
1
What should be the included angle of a twist drill for hard metal?
118 degrees
A piece of sheet metal is bent to a certain radius. The curvature of the bend is referred to as the
bend radius
The markings on the head of a Dzus fastener identify the
body diameter, type of head, and length of the fastener
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
The installation of Cherrymax and Olympic-Lok rivets is accomplished by utilizing
a pulling tool
The purpose of a joggle is to
allow clearance for a sheet or an extrusion
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
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
What is generally the best procedure to use when removing a solid shank rivet?
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
Select the alternative which best describes the function of the flute section of a twist drill.
forms the cutting edges of the drill point
A rivet set used to drive MS20470 rivets should
have a slightly greater radius than the rivet head
The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud length is measured in
hundredths of an inch
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
The sharpest bend that can be placed in a piece of metal without critically weakening the part is called the
minimum radius of bend
When bending metal, the material on the outside of the curve stretches while the material on the inside of the curve compresses. That part of the material which is not affected by either stress is the
neutral line
The shop head of a rivet should be
one and one-half times the diameter of the rivet shank
The length of a rivet to be used to join a sheet of .032-inch and .064-inch aluminum alloy should be equal to
one and one-half times the rivet diameter plus .096 inch
The sight line on a sheet metal flat layout to be bent in a cornice or box brake is measured and marked
one radius from the bend tangent line that is placed under the brake
When an MS20470D rivet is installed, its full shear strength is obtained
only after a period of age hardening
When riveting dissimilar metals together, what precautions must be taken to prevent an electrolytic action?
place a protective separator between areas of potential electrical difference
The most important factors needed to make a flat pattern layout are
radius, thickness, and degree of bend
A well-designed rivet joint will subject the rivets to
shear loads
The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud diameter is measured in
sixteenths of an inch
If a streamline cover plate is to be hand formed using a form block, a piece of dead soft aluminum should first be placed over the hollow portion of the mold and securely fastened in place. The bumping operation should be
started by tapping the aluminum lightly around the edges and gradually working down into the center
On a sheet metal fitting layout with a single bend, allow for stretching by
subtracting the setback from both legs
You can distinguish between aluminum and aluminum alloy by
testing with a 10 percent solution of caustic soda
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
Which rivets should be selected to join two sheets of .032-inch aluminum?
MS20470AD-4-4
Which of the following drill bit types work best when drilling an aramid fiber (Kevlar(c)) composite laminate?
Which of the following drill bit types work best when drilling an aramid fiber (Kevlar(c)) composite laminate?
Most rivets used in aircraft construction have
dimples
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
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
A piece of flat stock that is to be bent to a closed angle of 15° must be bent through an angle of
165 degrees
Which is the grip length of the flush rivet?
3
What is dimension D? Setback = .252 Bend allowance = .345
4.182
What is dimension F? Setback at D = .095 Setback at E = .068 Bend allowance at D = .150 Bend allowance at E = .112
5.936
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 to be used will be
5/16 inch
