7.8

Question 1

Where must rivets not be used

Answer 1

Thick materials or areas subject to high tension

Question 2

Lap joints (rivets)

Answer 2

There is a distinct step or change in level as skins are riveted together.
Not aerodynamically smooth.
Generally used on light aircraft where aerodynamic smoothness is not as important.

Question 3

Flush joints (rivets)

Answer 3

Used to obtain aerodynamic smoothness between two skins.
The skins are both riveted to the same substructure.
A flush patch repair uses a doubler.

Question 4

Joggle (rivets)

Answer 4

A combination of a flush and a lap joint.
One skin is jiggled to accommodate the other to produce one smooth side

Question 5

Pitch (rivets)

Answer 5

The distance from the centre of one fastener hole to the centre of the next, in a row.
Normally 4D

Question 6

Edge margin/land (rivets)

Answer 6

Edge margin is the distance from the centre of the fastener hole to the nearest edge of the sheet.

Normally 2D-2.5D

Question 7

Spacing

Answer 7

Distance between fastener rows, which is taken from the hole centres.
4-5D

Question 8

Sphere of influence

Answer 8

The area of sheet metal that the rivet achieves a watertight joint normally 5D

Question 9

Rivet cutter

Answer 9

Used to cut rivets to a required length when a correct rivet is unavailable

Question 10

3 types of dimpling

Answer 10

Coin
Radius
Hot