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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
What is bridge lighting ?
Where multiple lamps in a housing are focused over an area of standardised instruments
26
What are trans illuminated panels?
Bonded layers of acrylic plastics where light is reflected down the panels and escapes at facets
27
Why is flood lighting usually used ?
For the general illumination of instruments and controls
28
How is urgency displayed on warning systems ?
Colour of the display and or audio tone
29
What colour are warning signals ?
Red
30
What colour are caution alerts ?
Amber
31
What colour are advisory signals ?
Green
32
What colour are status indicators ?
White
33
How can warning and indication lighting be tested ?
Pressing in the lamp cover creates contact of the test switch
34
What positions does the master test switch have ?
-test -bright -dim
35
Where is the master caution system located ?
At pilots eye level of the EFIS panels
36
Why is cabin lighting installed ?
To create a safe and comfortable environment for the cabin crew and passé
37
What type of lighting is generally used in the cabin ?
Wash lighting, not visible to the eye, but reflected from adjacent areas
38
Where can cabin lighting be controlled from ?
A cabin management system (CMS)
39
what are gas discharge lamps?
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
what is needed for a gas discharge lamp to start?
a very high voltage. a starter unit is often used in homes, however not in aircraft as it generates magnetic interference
41
what are the types of gas discharge lamps found in aircraft?
-cold start flourescent lamps -direct start flourescent lamps -strobe ights
42
why are ballasts used in cold start flourescent lamps?
so that no high voltage peaks are created, but a constant high voltage instead
43
how do direct start flourescent lamps work?
they are constantly heated by a metal strip on the outer wall of the lamp
44
what type of light is oftenly used in no smoking or fasten seat belt signs ?
LED's or electroluminescent type
45
where are LED's or flourescnt lamps usually located?
for general, indirect and concealed lighting in sidewalls, ceilings and similar places
46
what lighting is used to provide soft low level lighting in ceilings directly above the aisles, work areas, toilet occupied and passenger reading lights?
incandescent lights or LED's
47
how does the lavatory occupied sign light up ?
wired to the door lock, it will come on automatically when it is locked
48
what type of sitch is the switch for the flight deck door ceiling light?
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
when are lavatory dome lights on?
whenever the aircraft is using or supplying electrical power
50
how are the overhead reading lights controlled?
passenger can operate them individually along side the light or as part of a built in seat controller
51
how is the lighting in the cargo bays, equipment and avionics bay controlled?
by a switch or automatically comes on once the door is opened
52
generally, what type of light is used to illuminate compartments?
dome type lighting, powered by the ground service bus bar
53
how are bulbs and cargo protected from damage in the cargo bay?
lights are covered with lenses made of tempered glass or other durable materials to prevent heat damage or direct damage to the bulb.
54
what type of light is generally used for service lighting?
explosion proof dome or bulkhead type with conveniently located control switches
55
what type of light is generally used for service lighting?
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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