7.19 Me Lightening Flashcards

1
Q

At what height is it more common for lightening to occur

A

5000-15000

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2
Q

What type of flights is lightening more likely to occur at

A

Short haul flights

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3
Q

What can a single bolt of lightening contain

A

1 million to 30,000amps

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4
Q

Where does lightening normally enter through

A

Radome, forward fuselage, nacelle, empennage or wing tip

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5
Q

What may be seen in nose or wing tips

A

A red glow caused by ionisation

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6
Q

Where does the current flow from a strike

A

Through the conductive exterior skin and structure and exits out of another extremity such as tail, seeking polarity or ground

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7
Q

What protects the internal from EMI

A

the external structure

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8
Q

What are the two types of damage from a strike

A

Direct
Indirect

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9
Q

What is direct damage

A

Surface burned, melted or signs of metallic distortion

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10
Q

What is indirect damage

A

Electrical damage

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11
Q

What is the size of a normally melt mark

A

1/8

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12
Q

What is the size of a large burn mark

A

1/4

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13
Q

What else can you look out for to see lightening damage

A

Colour distortion on skin or rivets

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14
Q

What does HIRF stand for

A

High intensity radiated fields

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15
Q

What can HIRF do to an aircraft

A

Cause electromagnetic interference from external source which could upset the digital systems

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16
Q

Since when have aircrafts complied with HIRF

A

1992

17
Q

What should happen modifications to a/c do

A

Be asses by manufacture for effect to HIRF