7.19

Question 1

What heights does a lightning strike normally occur in ?

Answer 1

8000 - 14,000 ft
( happens mainly over land )

Question 2

Approximately how many flying hours does a lightning strike happen ?

Answer 2

Every 3000 hours.

Question 3

What’s the two types of damage a lightning strike causes ?

Answer 3

Direct damage - damage to structure etc
Indirect damage - damage to electrical systems

Question 4

Does lightning travel inboard or outboard when travelling on wing ?

Answer 4

Outboard

Question 5

What happens if the lightning strikes the empannage or the wing surfaces ?

Answer 5

Stays and doesn’t travel until the lightning current stops.

Question 6

When a lightning strike hits the Radome, where does the diverter strips on the surface divert the the lightning strike ?

Answer 6

To the aircraft’s structure.

Question 7

If aircraft is struck with lightning and away from base, what could a be used as a small temporary fix ?

Answer 7

Speed tape.

Question 8

What does a high intensity lightning strike cause produce which damages electric systems in an unpressurised area ?

Answer 8

Electromagnetic field.

Question 9

Why do you use non-ferrous materials in areas which have sensitive equipment to lightning ?

Answer 9

As non-ferrous materials don’t become magnetised if struck with lightning.

Question 10

What is HIRF ?

Answer 10

Electromagnetic radiation which can affect aircraft systems.
( can e caused by lightning )

Question 11

Whats the three primary areas to be considered for HIRF protection ?

Answer 11

Structure
Electrical wiring
Equipment

Question 12

How can you detect a heavy landing ?

Answer 12

Creased or wrinkled skin
Fuel leakage

Question 13

Whats a high drag/side-load landing ?

Answer 13

If the aircraft has landed with two or more blown tyres, skidded or landed short of the runway

Question 14

Whats the two main areas checked during a phase 1 inspection ?

Answer 14

MLG
Structural components

Question 15

What comes after a phase 1 inspection if you have located damage ?

Answer 15

Phase 2 inspection

Question 16

Does the landing have to be hard on an overweight landing for engineers to inspect for damage ?

Answer 16

No. The landing can be smooth but the aircraft would still have to be inspected.

Question 17

What should you do if during a turbulence inspection, you see wrinkling on the wing ?

Answer 17

Remove rivets where wrinkle is and examine shank to determine if the rivets have sheared or were slightly loaded in shear

Question 18

If the wheels have been lowered during a period of serve turbulence, where can you check to determine the gust conditions ?

Answer 18

Wheel well bay

Question 19

What does the g force have to range in to cause damage to the aircraft’s airframe ?

Answer 19

2.5 - 5 gs

Question 20

What can test the airworthiness and strength of a aluminium structure ?

Answer 20

Eddy-current conductivity tester ( hardness tester )