Rivet EASA

Questions and Answers

What provides the remaining 25% of hardness to a solution treated rivet?

Leave at room temperature for four hours. (correct)

Quench in cold water immediately.

Precipitation treat the component when forming is complete.

Put them in a refrigerator.

What must be done to D or DD rivets if they are removed from the freezer late?

They must be re-heat treated before use. (correct)

They can be used immediately.

They can be re-heat treated once then discarded.

They must be discarded.

A joggle in a removed rivet indicates what type of partial failure?

Shear. (correct)

Compression.

Bearing.

Tension.

How is a British aluminum rivet specifically identified?

Black anodic finish. Signup and view all the answers

What color and marking would a BS rivet made from L36 have?

Black anodic with an 'A'. Signup and view all the answers

What do the letters and numbers on a British rivet indicate?

Head shape, material and finish. Signup and view all the answers

Precipitation treatment of rivets occurs after which step in the process?

After forming is complete. Signup and view all the answers

Which option is NOT a characteristic of a D or DD rivet issue?

Can be used immediately. Signup and view all the answers

What is the overall length of a countersunk rivet indicated by MS20426AD-6-5?

5/16 inch Signup and view all the answers

Which rivet can be used immediately without any further treatment?

2117-T3 Signup and view all the answers

Where can the information on rivet grip length be found in the rivet code quadrant?

SE Signup and view all the answers

What does the NE rivet quadrant provide information about?

diameter and manufactured head location Signup and view all the answers

What does a square around the NW digit in a fastener quadrant indicate?

fluid tight fastener Signup and view all the answers

Which designation represents the four quadrants in a quadrant rivet code system?

NW, NE, SE, SW Signup and view all the answers

The rivet type 2024-T4 is primarily used for which of the following characteristics?

High strength-to-weight ratio Signup and view all the answers

Which of the following options is NOT a designation of a fastener quadrant?

NH Signup and view all the answers

What is identified by a D on a natural finish aluminium alloy rivet?

Duralumin L37 Signup and view all the answers

What color anodise identifies a 5% magnesium rivet?

Green anodise with 'X' Signup and view all the answers

What metal is suitable for riveting magnesium alloy?

5056 aluminium alloy Signup and view all the answers

What type of rivet is identified by having a cross on the head?

5056 aluminium alloy Signup and view all the answers

What is the identification for an aluminium alloy L37 rivet?

D embossed Signup and view all the answers

What is the specified rivet allowance?

1.5d Signup and view all the answers

What is the purpose of refrigerating D and DD rivets?

To retard age hardening Signup and view all the answers

What should be done to 2017 and 2024 rivets after heat treatment?

Use immediately or refrigerate Signup and view all the answers

What head style does a countersunk rivet of the ‘SP’ series have?

100 ° Signup and view all the answers

What information does the coding of a British rivet indicate?

Material and head type Signup and view all the answers

Which factor determines the minimum space between rivets?

Diameter of the rivets being used Signup and view all the answers

What will joggles in removed rivet shanks indicate?

Shear failure Signup and view all the answers

Identification of British aluminium alloy rivets typically includes what?

A colour and number stamped on the head Signup and view all the answers

What type of rivet should be used when access to both sides of a structure is limited?

Hylok Signup and view all the answers

What process contributes the additional 25% of a solid rivet's shear strength?

Leaving assembly for 4 days to age harden. Signup and view all the answers

What marking indicates a rivet made from the material code AD?

Unmarked rivet. Signup and view all the answers

Which head type does the rivet designated as MS20426 have?

CSK. Signup and view all the answers

What is defined by the term 'Pitch Ratio' in rivetting?

The distance between two holes. Signup and view all the answers

In what graduations is the length of solid rivets measured?

1/16 inch. Signup and view all the answers

What would be the diameter and length of a solid rivet marked AS 162-408?

1/8 inch dia, 1/2 inch length. Signup and view all the answers

What does the marking '.5' indicate in a solid rivet's part number?

Close tolerance rivet. Signup and view all the answers

What is the specified pressure range for the Avdel Riveter type F?

60 to 80 psi. Signup and view all the answers

What is the operation stroke length of the Avdel Riveter type F?

1/2 inch. Signup and view all the answers

What rivet size is recommended for joining a sheet of aluminum alloy thicknesses of 0.032 and 0.064?

0.096 plus 1.5 D. Signup and view all the answers

In what type of structure would a pop rivet with a break stem mandrel be utilized?

In a closed structure. Signup and view all the answers

What is the wear limit for a chobert rivet gun?

0.002 inch. Signup and view all the answers

How is the closure of Avdel rivets achieved?

By broaching. Signup and view all the answers

What are the two angles of countersink for countersunk rivets?

100 - 115 degrees. Signup and view all the answers

What happens to the mandrel section of a CHERRY MAX rivet after riveting?

It remains in the rivet sleeve. Signup and view all the answers

What type of rivet should be used when the backside cannot be accessed?

Blind rivet Signup and view all the answers

Which material is most suitable for riveting steel?

Monel Signup and view all the answers

Cadmium plated rivets should not be used where the temperature may exceed what degree Celsius?

250 °C Signup and view all the answers

What rivets are recommended for use with nickel alloy steel?

Monel Signup and view all the answers

What is the main advantage of a double flare on aluminium tubing?

Increased resistance to shear forces Signup and view all the answers

Which type of load is most likely to cause rivet failures?

Head Signup and view all the answers

Rivets are primarily designed to resist which type of loads?

Shear loads Signup and view all the answers

If a plate measuring 10 inches by 5 inches is to be riveted using 3 rows with a 4D spacing, how many rivets are needed?

60 Signup and view all the answers

What indicates that a new aluminium alloy rivet is anodised with an 'x'?

It is green alloy Signup and view all the answers

Which type of heat treatment can be applied to DD rivets?

Solution treatment Signup and view all the answers

What is the general rule for determining the appropriate diameter for rivets?

Three times the thickness of the thickest material Signup and view all the answers

Cherrymax and Olympic-Lok rivets require what for installation?

Rivet gun, special rivet set, and bucking bar Signup and view all the answers

Why should hole-filling fasteners not be used in composite structures?

Possibility of causing delamination Signup and view all the answers

What are the dimensions of MS20430AD-4-8 rivets?

1/8 inch diameter and 1/4 inch long Signup and view all the answers

Which number indicates the primary alloying agent of 2024-T36 rivets?

2 Signup and view all the answers

Most rivets used in aircraft construction typically have what feature?

Dimples Signup and view all the answers

Study Notes

Rivet Hardness and Treatment

Forming a solution-treated rivet achieves 75% hardness; the remaining 25% is gained by room temperature aging for four hours.
D or DD rivets not processed timely require re-heat treatment before use.

Identification of Rivets

Joggle in a removed rivet shank indicates a shear partial failure.
British aluminium rivets are identified by a black anodic finish.
L36 BS rivets have a black anodic finish with an 'A' marking.
British rivet identification includes head shape, material, and finish; for example, SP80 denotes snap head aluminium alloy with violet finish.
A natural finish aluminium alloy rivet marked 'D' signifies duralumin L37.
5% magnesium rivets are identified by green anodise with an 'X' or '8'.

Riveting Materials and Specifications

Suitable materials for riveting magnesium alloy include 5056 aluminium alloy.
Monel metal is appropriate for riveting alloy steel.
Identification of L37 rivets includes a 'D' embossed mark.
Rivet allowance is calculated as 1.5 times the diameter.

Rivet Treatment and Aging

Refrigeration of D and DD rivets retards age hardening.
After heat treatment, 2017 and 2024 rivets can be used immediately or refrigerated.
Solid rivets only achieve 75% shear strength at formation; the remaining 25% requires four days of aging.

Rivet Types and Uses

An unmarked rivet corresponds to material code 'A.'
MS20426 rivets have a countersunk (CSK) head type.
Pitch Ratio refers to the distance between two holes.
Rivet lengths are in increments of 1/16 inch.
Markings like AS 162-408 indicate a rivet with 1/8 inch diameter and ½ inch length.

Riveting Tools and Techniques

Avdel Riveter Type F operates within a pressure range of 60 to 80 psi with a stroke length of ½ inch.
For joining different thicknesses of aluminium alloy, the rivet should be 0.096 plus 1.5D.
Pop rivets with break stem mandrels are used in closed structures.
Chobert rivet gun wear limit is 0.002 inch below nominal diameter.

Types of Rivets

Cherry MAX rivets leave the mandrel inside the rivet sleeve for mechanical strength after installation.
Huck rivets are similar in design to cherry rivets and both are classified as blind rivets.
When back access is unavailable, a blind rivet is preferred for structural repairs.

Riveting Requirements and Safety

Cadmium plated rivets are unsuitable where temperatures exceed 250°C.
Hole filling fasteners like MS20470 rivets can lead to delamination in composite structures.
Dimensions of MS20430AD-4-8 rivets are 1/8 inch in diameter and 1/4 inch in length.

General Riveting Knowledge

Most aircraft rivets feature dimples for identification.
The primary alloying agent of 2024-T36 rivets is indicated by the number '2'.
The type loads causing the most rivet failures are head loads, while shear loads represent a rivet's main strength quality.### Rivet Specifications and Codes
MS20426AD-6-5 identifies a countersunk rivet with an overall length specification of 5/16 inch.
Rivet 2117-T3 can be used as received without further treatment; it is classified as an 'AD' rivet.
Information regarding rivet grip length can be found in the SE quadrant of rivet code, referenced in NAS-523.

Rivet Quadrants

The NE quadrant provides details on rivet diameter and manufactured head location; it is also part of the NAS-523 system.
A square around the NW digit in the quadrant indicates that the fastener is a fluid tight fastener.
The four quadrants in the rivet code system are designated as NW, NE, SE, and SW.

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Description

Test your knowledge on the processes involved in achieving rivet hardness. This quiz covers aspects of rivet treatment, including the effects of temperature and precipitation on the material's strength. Perfect for students studying metalworking or mechanical engineering.