Airframe (AMA) Chapters- Sheet Metal and Non-Metallic Structures

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 Exp. The rivet should protrude through the material for 1-1/2 diameters The to tap length of the ot the rivet must be ( material thickness + rivet diameter

1/4 inch

Which of the rivets shown will accurately fit the conical depression made by a 100° countersink A- 130° B- 80° C- 50°

130°

When drilling stainless steel, the drill used should have an included angle of A- 90° and turn at a low speed B- 118° and turn at high speed C- 140° and turn at a low speed

140° and turn at a low speed

What should be the included angle of a twist drill for soft metals? A- 118° B- 90° C- 65°

90°

A piece ot flat stock that is to be bent to a closed angle of 15° must be bent through an angle of A- 165° B- 105° C- 90°

165°

When conducting a tap test on a composite panel, which of the following sounds would indicate delamanation A- sharp ringing B- dull thud C- sharp thud

Dull thud

A rivet set used to drive MS 20470 rivets should A- have the same radius as the rivet head B- have a slight 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

Have a slight greater radius than the rivet head

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

Shear failure

Threaded rivets (rivnuts) are commonly used to A- join two or more pieces of sheet metal where shear strength is desired B- attach parts or components with screws to sheet metal C- join two or more pieces of sheet metal where bearing strength is desired

Attach parts or components with screws to sheet metal

How does acoustic emission testing defect defects in composite materials A- by picking up the noise of any deterioration that may be present B- by analyzing ultrasonic signals transmitted into the parts being inspected C- by creating sonogram pictures of the areas being inspected

By picking up the noise of any deterioration that may be present

If no scratches are visible after transparent plastic enclousure materials have been cleaned, their surface should be A- polished with rubbing compound applied with a damp cloth B- buffed with a clean, soft, dry cloth C- covered with a thin coat of wax

Covered with a thin coat of wax

If an aircraft's transparent plastic enclosure exhibit fine cracks which may extend in a network over or under the surface or through the plastic, the plastic is said to be A-hazing B- brinelling C- crazing

Crazing

If it is necessary to compute a bend allowance problem and bend allowance tables are not available, the netural axis of the bend can be A- represented by the actual length of the required material for the bend B- found by adding approximately one-half of the stock thickness to the bend radius C- found by subtracting the stock thickness from the bend radius

Found by adding approximately one-half of the stock thickness to the bend radius

The coefficient of expansion of most plastic enclosure materials is A- greater than both steel and aluminum B-greater than steel but less than aluminum C- less than either steel and aluminum

Greater than both steel and aluminum

Which of the following are generally characteristics of aramid fiber (Kevlar) composities A- high tensile strength and flexibility B- high tensile strength and stiffness C- corrosive effect in contact with aluminum and ability to conduct electricity

High tensile strength and flexibility

Unless otherwise specified, the radius of the a bend is the A- inside radius of the metal being formed B- inside radius plus one-half the thickness of the metal being formed C- radius of the neutral axis plus one-half the thickness of the metal being formed

Inside radius of the metal being formed

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

Low strength characteristics

The shop head of rivet should be A- one and one-half times the diameter of the rivet should be 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

One and one-half times the diameter of the rivet should be

Fiberglass laminate damage that extends completely through one facing and into the core A- cannot be repaired B- requires the replacement of the damaged core and facing C- can be repaired by using a typical metal facing patch

Requires the replacement of the damaged core and facing

The part of a replacement honeycomb core that must line up with adjacent original is the A- cell side B- ribbon direction C- cell edge

Ribbon direction

Parts fabricated from Alclad 2024-T3 aluminum sheet stock must have all A- bends made with a small radius to develop maximum strength B-bends 90° to the grain C-scratches, kinks, tool marks, nicks, etc., must be held to a minimum

Scratches, kinks, tool marks, nicks etc., must be held to a minimum

When inspecting a composite panel using the ring test/tapping method, a dull thud may indicate A- less than full strength curing of the matrix B- separation of the laminates C-an area of too much matrix between fiber layers

Separation of the laminates

What type loads cause the most rivet failures? A- shear B- bearing C-head

Shear

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

Soften to facilitate riveting

If a new safety belt is to be installed in aircraft, the belt must conform to the strength requirements in which document A- STC 1282 B- 14 CFR Part 39 C- TSO C22

TSO C22

What is one of the deterring factors which permis machine countersinking when flush riveting A- thickness of the material and the rivet diameter are the same B- thickness of the material is less than the thickness of the rivet head C- thickness of the material is greater than the thickness of the rivet head

Thickness of the material is greater than the thickness of the rivet head

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

Two times the diameter of the rivet shank

Which of these methods maybe used to inspect fiberglass/honeycomb structures for entrapped water A- backlighting and acoustic emission monitoring B- X-ray and acoustic emission monitoring C- X-ray and backlighting

X-ray and backlighting

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

diameter of the rivets being used