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Module 11 Richard > 11.14 Lights > Flashcards

11.14 Lights Flashcards

1
Q

What are the 3 categories that lights are loosely split in to

A
  • Internal
  • External
  • Emergency
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2
Q

How are most of the aircraft lights powered

A

By AC or DC power

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3
Q

What do some AC unit lights incorporate to alter supply or intensity of power

A

They have their own auto transformers to step down aircraft 115v electrical power down to the lights working voltage or from 28v to 10v or 6v

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4
Q

What ATA chapter is lights

A

ATA 33

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5
Q

What is the purpose of navigation lights

A

To mark the aircrafts position and indication of its orientation with reference to its observer. Nav lights are mandatory and required by law

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6
Q

What are the colours and angles of the nav lights

A
  • Red: visible to 110 degrees for the left
  • Green: Visible to 110 degrees for the right
  • White: Visible from back 70 degrees to left and right

=360 degrees

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7
Q

What power will nav lights be supplied by

A

28v AC or DC power

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8
Q

What can be used to power the nav lights on the ground

A

They can be powered by AC or by DC from the batteries or by external power

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9
Q

Where are the anti collision lights positioned

A

On the fuselage top and bottom

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10
Q

What is the normal rotational speed of the rotating beam lighting and what frequency of flashes per min would that give

A

Normal rotational speed of 40-45mph and a frequency of 80-90 flashes per min

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11
Q

How are the rotational beam lighting powered

A

28v DC with a DC motor

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12
Q

How do strobe lights provide light

A

They provide a high intensity flash by using a set of capacitors to store up an electrical charge and then releasing the charge across a gap inside a gas filled tube to produce a flash of light

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13
Q

What is the flashing frequency of strobe lights

A

60-70 flashes per min

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14
Q

How are strobe lights powered

A

Either 28v DC or 115 AC and store enough charge to produce a voltage of 450v to produce a flash

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15
Q

What is the stroboscopic effect

A

Can cause problems in some people (induce fits, epilepsy), makes moving or rotating objects appear stationary

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16
Q

What damage can be caused by strobe lights and what precautions should be done before commencing work on them

A
  • Stroboscopic effect
  • Eyesight damage: due to bright light
  • Capacitance/heat: During maintenance make sure capacitors are discharged and heat dissipated before commencing work
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17
Q

What are the purpose of landing lights

A

They are installed on aircraft to supply sufficient illumination for the crew during the final stages of landing. They are mandatory

Typical places they are found: Wing leading edges, undercarriage legs and flap track fairings

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18
Q

What two types of landing light are there

A

Fixed: To the structure, do not alter when illuminated

Retractable: Can be deployed when needed

19
Q

What sort of power would supply landing lights

A

28v AC or DC and power rating about 600watts. 115v AC is supplied through a transformer to give 28v DC

20
Q

How much surge current can the transformers contacts take when transferring energy to the landing lights

A

15 times normal value

21
Q

What is the purpose of taxi/turn off lights

A

To allow the pilot to manoeuvre the aircraft on the ground in the dark or poor visibility

22
Q

What makes turn off lights different to taxi lights

A

They’re fitted on an angle instead of being straight on from the aircraft

23
Q

What is the power rating of taxi lights

A

Normally lower than landing lights at around 250’watts the power supply is 28v AC or DC

24
Q

What two filaments are installed on combined taxi/landing lights

A

400w taxi

1000w landing

25
Q

What ensures the combined taxi/landing lights only operate when the gear is down and locked

A

The light switch circuit is via a contact in the landing gear handle

26
Q

Why would an aircraft be fitted with a light illuminating the leading edge of the wings and sometimes the engine intake lip

A

They are known as ice inspection lights and provide sufficient illumination to see any ice build up

27
Q

What is the power supply for ice inspection lights

A

28v AC or DC

Normally between 60w and 250w depending on requirements

28
Q

What is the purpose of internal lighting

A

For the passengers to see, to enable crew to do their job effectively.

29
Q

What is the purpose of instrument lighting

A
  • To ensure the cockpit instruments are readable during all lighting conditions
  • So no glare effects the instruments
30
Q

What are the two types of instrument lights are there

A
  • Integral lighting: An internal Part of the instrument

- Flood lighting: External to the instrument

31
Q

What type of lighting system does the Central Warning Systems (CWS) have

A

A daytime setting brighter than night setting as in the day with ambient light it is harder to see

32
Q

What does the storm lighting system do

A

When pressed it overrides all dim settings of any screens during a storm or bad weather to enable clear vision

33
Q

What should be done to instruments lighting when the aircraft is being worked on

A

Turned to its dimmest setting to prevent heat build up

34
Q

What type of power are cockpit warning and indication lights powered by

A

From the DC battery bus or from various DC sources to ensure effective working during system failures

35
Q

What is used to test all of the cockpit lights are operational

A

A master test switch

It has 3 functions:
>Test - All warning and indicating lights are tested
>Bright - All lights to brightest function
>Dim - Illuminated with less intensity via a zener diode

36
Q

What is the purpose of the Master Caution System

A

Indicates a fault on a particular system, installed at pilots eye level

37
Q

What type of light is the cabin generally illuminated by

A

‘Wash lights’

38
Q

What is the purpose of lights in cargo bays

A

To help during loading and maintenance activity

39
Q

What will cargo bay lights be powered by

A

28v DC direct from aircraft battery

40
Q

What is the purpose of emergency lighting

A

To assist passengers and staff in the state of emergency

They are required by law

41
Q

What areas are illuminated by emergency lighting

A
  • Cabin
  • Exits
  • Escape slides
  • Illuminated escape paths
42
Q

What are the 3 positions of the emergency lights

A
  • Off: The system is de energised
  • On: Lights are on steady
  • Armed: Lights are off in normal aircraft operation and comes on in the event of a power failure
43
Q

How is the emergency lights supplied if the DC supply fails

A

Their own emergency battery packs take over

44
Q

What intensity must the emergency lights illuminate at and for how long when in active emergency mode

A

A minimum of 400 lamberts for at least 10 minutes

Module 11 Richard (19 decks)

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