11.14 Lights Flashcards
How is light produced?
Thermal radiation caused by passing a high current through a conductor.
What is luminous intensity measured in?
candela
What is luminous flux?
The amount of light radiated per second.
What is the unit of luminous flux?
Lumen
The ratio between luminous flux and the power consumed is called what?
Efficacy
How much higher is the start up power of a bulb compared to normal consumption?
15 times
What percentage of the energy that goes to a bulb is light?
12%
Why must halogen bulbs glass not be touched?
The aluminosilicate glass absorbs salt and grease from the skin.
What part of a strobe light actually emits the light.
Control electrode.
What are some of the advantages of LED’s?
Reduced mass
Reduced consumption
Longer life
Resilient
What regulation governs lights?
SERA.3215
Are nav lights mandatory?
Yes
What side is the red nav light?
Left
To what degrees must side nav lights be visible?
110 degrees
Rear- 70 degrees
What is the ELMS?
Electronic load management system
Where are the anti-col lights?
Wing tip and or upper/lower fuse
What is the common voltage of a beacon?
28 or 115
How do strobes flash?
Using a set of capacitors that store up the energy and then release it across a gap in a gas filled tube.
How much charge do the capacitors in a strobe store?
450v
Landing lights in dim mode use what voltage?
7 AC
How are landing lights aligned?
Aircraft on level ground and aircraft no more than 5 degrees from level.
What 4 categories of internal lighting are there?
Flight deck
Passenger
Service
Emer
How are incandescent lights manually dimmed?
Potentiometer
Transistor with Zener Diode
Transformer
When is a transistor used instead of a potentiometer?
When a large amount of lights must be controlled
What does a Zener diode allow?
Two modes, bright and dim
What is a rheostat?
Dimming switch
What is a circuit that uses a Diac and Triac known as?
Phase shifter circuit
What does a small time constant give you in terms of brightness?
Full power
What is a wander light?
Map reading light
What are the two purposes of a glare shield?
To stop sun from whiting displays and to reflect instrument lighting to cast an overall lighting.
In wedge lights what is the result of a lower angle?
More light is reflected
What are trans-illuminated panels?
Bonded layers of acrylic plastics
What are the two types of warning system in the cockpit?
Central warning System CWS
Crew Alert System CAS
What system is CWS?
Analogue system
What system is CAS?
Digital like ARINC
What is wash lighting?
Lights through the length of the cabin.
How is fluorescence in a lighting tube created?
When a free electron collides with mercury vapour atoms to produce ultra-violet radiation.
If the engines are running and you open the flight deck door, what happens to the door light?
It turns off to avoid glare on the instruments.
What must the emergency lighting system include?
Illuminated emer exit
Exterior emer lighting
How long does the battery keep the emergency lights on for?
10-20 mins
How long does it take to recharge the emergency lights battery?
16 hours
What gas is in glow in the dark lights?
Tritium
