M9.2 (ears)

Question 1

What regulation is for engineers working on a/c?

Answer 1

CAP 562 leaflet H60

Question 2

What’s the function of the ear?

Answer 2

Detect sound
Monitor balance

Question 3

3 divisions of the ear?

Answer 3

Inner ear
Middle ear
Outer ear

Question 4

Outer ear?

Answer 4

Directs sound along auditory canel and onto ear drum

Question 5

Middle ear?

Answer 5

Located behind ear drum
Uses 3 small bones to transfer vibrations from ear drums to fluid of inner ear

Question 6

What are the 3 small bones in the middle ear?

Answer 6

Hammer
Anvil
Stirrup

Question 7

What does the aural and acoustic reflex do?

Answer 7

Protects the ear from sounds above 80dB
By reducing it to 20dB for 15 mins

Question 8

The aural reflex causes people to be what?

Answer 8

Deaf for a few secs after a loud noise

Question 9

What is the middle ear filled with and how is it refreshed?

Answer 9

Air
Refreshed with eustachin tube connected to back of mouth and nose

Question 10

What’s the problem with the eustachin tube?

Answer 10

Allow mucus to travel to middle ear and build up

Question 11

What’s the inner ear filled with?

Answer 11

Fluid

Question 12

Inner ear?

Answer 12

Ossicles connected to cochlea contains a fine membrane which is covered in hair like cells.
Which react to movement in the fluid. Will then send impulses to the brain

Question 13

What influences vibrations?

Answer 13

Volume
Pitch of sound

Question 14

Timitus?

Answer 14

Permanent ringing in ear caused by loud noises

Question 15

How much does hearing protection reduce noise?

Answer 15

Ear plugs - 20dB
Ear defenders - 40dB

Question 16

When must you wear hearing protection?

Answer 16

Sounds above 115dB
Working 200-300m away from a/c with engines running

Question 17

Presbycusis?

Answer 17

When hearing detirorates with age, affects the ability to hear high pitch sound

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