7.19 Flashcards
What heights does a lightning strike normally occur in ?
8000 - 14,000 ft
( happens mainly over land )
Approximately how many flying hours does a lightning strike happen ?
Every 3000 hours.
What’s the two types of damage a lightning strike causes ?
Direct damage - damage to structure etc
Indirect damage - damage to electrical systems
Does lightning travel inboard or outboard when travelling on wing ?
Outboard
What happens if the lightning strikes the empannage or the wing surfaces ?
Stays and doesn’t travel until the lightning current stops.
When a lightning strike hits the Radome, where does the diverter strips on the surface divert the the lightning strike ?
To the aircraft’s structure.
If aircraft is struck with lightning and away from base, what could a be used as a small temporary fix ?
Speed tape.
What does a high intensity lightning strike cause produce which damages electric systems in an unpressurised area ?
Electromagnetic field.
Why do you use non-ferrous materials in areas which have sensitive equipment to lightning ?
As non-ferrous materials don’t become magnetised if struck with lightning.
What is HIRF ?
Electromagnetic radiation which can affect aircraft systems.
( can e caused by lightning )
Whats the three primary areas to be considered for HIRF protection ?
Structure
Electrical wiring
Equipment
How can you detect a heavy landing ?
Creased or wrinkled skin
Fuel leakage
Whats a high drag/side-load landing ?
If the aircraft has landed with two or more blown tyres, skidded or landed short of the runway
Whats the two main areas checked during a phase 1 inspection ?
MLG
Structural components
What comes after a phase 1 inspection if you have located damage ?
Phase 2 inspection
Does the landing have to be hard on an overweight landing for engineers to inspect for damage ?
No. The landing can be smooth but the aircraft would still have to be inspected.
What should you do if during a turbulence inspection, you see wrinkling on the wing ?
Remove rivets where wrinkle is and examine shank to determine if the rivets have sheared or were slightly loaded in shear
If the wheels have been lowered during a period of serve turbulence, where can you check to determine the gust conditions ?
Wheel well bay
What does the g force have to range in to cause damage to the aircraft’s airframe ?
2.5 - 5 gs
What can test the airworthiness and strength of a aluminium structure ?
Eddy-current conductivity tester ( hardness tester )
