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Module 11 Submodules 11.11 To 11.21 > 11.14 Internal Lighting > Flashcards

11.14 Internal Lighting Flashcards

1
Q

What ATA chapter is lights in ?

A

ATA chapter 33

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2
Q

What is important about the power sources of emergency lighting?

A

Not only connected to the main aircraft batteries , but also to the emergency battery packs

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3
Q

How are the main lights connected to power?

A

Through various busbars, this is advantageous as if one bus bar fails, total lighting is not lost

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4
Q

If there is a total electrical failure, what type of lighting comes on?

A

Standby lighting is powered by the aircraft battery

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5
Q

What are the four lighting categories ?

A

-flight compartment and operational
- passenger compartment
- service
- emergency

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6
Q

When installing lights, how should they be installed?

A
  • that direct rays should be the shielded from the pilots eyes
  • no objectionable reflections are visible to the pilot
  • unless undimmed lights are satisfactory, there must be a means of controlling the intensity of the light
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7
Q

What are the manual control methods of incandescent light’s intensity ?

A

-a potentiometer
-a transistor with a zener diode
-a transformer with pulse width modulation

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8
Q

How is illumination controlled with a potentiometer ?

A

Several resistors reduce the voltage across the lamp. Usually used to vary DC voltage for small numbers of lamps

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9
Q

How is illumination controlled with a transistor ?

A

Used instead of a resistor for when a large number of lights needs to be controlled.

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10
Q

How is illumination controlled with a zener diode ?

A

Zener diode is used to drop the voltage when only two light levels are needed ( dim and bright)

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11
Q

What type of current are incandescent lights fed with ?

A

A/C current

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12
Q

What is the benefit of using a transformer instead of a potentiometer to control illumination?

A

They have a smaller internal power loss

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13
Q

How was dimming of lights achieved in older aircraft?

A

Rheostats

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14
Q

What types of lights are available in the flight deck ?

A
  • flood lighting
  • map reading Lights
  • instrument lighting
  • glare shield lighting
  • storm lighting system
  • integral lights
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15
Q

What is a storm lighting system ?

A

Used in thunderstorms, a switch is used to override the dim function and all lights are brung to full brightness

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16
Q

What lighting do dome lights create ?

A

Background lighting

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17
Q

How are some lights powered ?

A

Powered off of the battery bus

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18
Q

What are map reading ( utility or wander ) lights ?

A

Dimmable, hard wired units producing white or red light that can sometimes be removed from its housing and used handheld with a coiled lead

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19
Q

What are the types of instrument lighting ?

A
  • integral
  • wedge
  • pillar
  • bridge
  • trans-illuminated
  • panels
  • glare shields
  • floodlighting
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20
Q

What is the point of glare shield lighting ?

A
  • To stop the natural whiting of instruments of sunny days
  • to reflect the instrument panel lighting when selected downward to illuminate the instruments
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21
Q

How does wedge lighting work ?

A

Light is reflected down a wedge shaped tube out of a crevice, a special bezel is used to focus light toward the instrument, preventing reflection into the pilot’s eyes

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22
Q

How is light distributed in a pillar type lighting system ?

A

Through a filter and an aperture in the lamp housing

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23
Q

What lamps are often used in standby magnetic compasses ?

A

“Pea” lamps

24
Q

What is important to consider about pea lamps fitted in the standby magnetic compasses and pea lamps in general ?

A

Pea lamps fitted inside the standby magnetic compass are made of a different material, so that there isn’t a magnetic field created, creating deviation in the compass

25
Q

What is bridge lighting ?

A

Where multiple lamps in a housing are focused over an area of standardised instruments

26
Q

What are trans illuminated panels?

A

Bonded layers of acrylic plastics where light is reflected down the panels and escapes at facets

27
Q

Why is flood lighting usually used ?

A

For the general illumination of instruments and controls

28
Q

How is urgency displayed on warning systems ?

A

Colour of the display and or audio tone

29
Q

What colour are warning signals ?

A

Red

30
Q

What colour are caution alerts ?

A

Amber

31
Q

What colour are advisory signals ?

A

Green

32
Q

What colour are status indicators ?

A

White

33
Q

How can warning and indication lighting be tested ?

A

Pressing in the lamp cover creates contact of the test switch

34
Q

What positions does the master test switch have ?

A

-test
-bright
-dim

35
Q

Where is the master caution system located ?

A

At pilots eye level of the EFIS panels

36
Q

Why is cabin lighting installed ?

A

To create a safe and comfortable environment for the cabin crew and passé

37
Q

What type of lighting is generally used in the cabin ?

A

Wash lighting, not visible to the eye, but reflected from adjacent areas

38
Q

Where can cabin lighting be controlled from ?

A

A cabin management system (CMS)

39
Q

what are gas discharge lamps?

A

flourescence in a lighting tube is created when free electrons collide with mercury vapour atoms to produce UV. UV is convertd to visible light by the flourescent material

40
Q

what is needed for a gas discharge lamp to start?

A

a very high voltage. a starter unit is often used in homes, however not in aircraft as it generates magnetic interference

41
Q

what are the types of gas discharge lamps found in aircraft?

A

-cold start flourescent lamps
-direct start flourescent lamps
-strobe ights

42
Q

why are ballasts used in cold start flourescent lamps?

A

so that no high voltage peaks are created, but a constant high voltage instead

43
Q

how do direct start flourescent lamps work?

A

they are constantly heated by a metal strip on the outer wall of the lamp

44
Q

what type of light is oftenly used in no smoking or fasten seat belt signs ?

A

LED’s or electroluminescent type

45
Q

where are LED’s or flourescnt lamps usually located?

A

for general, indirect and concealed lighting in sidewalls, ceilings and similar places

46
Q

what lighting is used to provide soft low level lighting in ceilings directly above the aisles, work areas, toilet occupied and passenger reading lights?

A

incandescent lights or LED’s

47
Q

how does the lavatory occupied sign light up ?

A

wired to the door lock, it will come on automatically when it is locked

48
Q

what type of sitch is the switch for the flight deck door ceiling light?

A

magnetic reed type switch, built in to the door so that it will automatically come on once the door is opened and engines are on

49
Q

when are lavatory dome lights on?

A

whenever the aircraft is using or supplying electrical power

50
Q

how are the overhead reading lights controlled?

A

passenger can operate them individually along side the light or as part of a built in seat controller

51
Q

how is the lighting in the cargo bays, equipment and avionics bay controlled?

A

by a switch or automatically comes on once the door is opened

52
Q

generally, what type of light is used to illuminate compartments?

A

dome type lighting, powered by the ground service bus bar

53
Q

how are bulbs and cargo protected from damage in the cargo bay?

A

lights are covered with lenses made of tempered glass or other durable materials to prevent heat damage or direct damage to the bulb.

54
Q

what type of light is generally used for service lighting?

A

explosion proof dome or bulkhead type with conveniently located control switches

55
Q

what type of light is generally used for service lighting?

A

explosion proof dome or bulkhead type with conveniently located control switches

Module 11 Submodules 11.11 To 11.21 (62 decks)

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