11.14 Lights Flashcards
Which 3 categories can lighting loosely be divided into?
- Internal
- External
- Emergency
Where is the Red Navigation light visible from?
A point directly ahead round to 110 degrees to the left side
Where is the Green navigation light visible from?
A point directly ahead round 110 degrees to the right of the aircraft
Where is the White navigation light visible from?
A point directly to the rear of the aircraft round 70 degrees to the left and right
What power are navigation lights normally supplied with?
28v AC or DC (Some aircraft have both)
Where are the flashing Anti-collision lights located?
On the top and bottom of the fuselage
What is the typical flashing frequency of strobe lighting?
60-70 flashes per minute
What is the stroboscopic effect?
Occurs after exposure to strobe lighting. Makes a moving/rotating object appear stationary, can induce epileptic fits
What are 3 typical locations for landing lamps
- Wing leading edges
- Undercarriage legs
- Flap track fairings
What are the two types of landing light units?
- Fixed
- Retractable
What is the initial surge current for Landing lights?
15x the normal value
What cautionary measure is in place due to landing lamp systems heating up?
A time limit of operation on the ground with no cooling airflow
What does the clutch on the Retractable landing light system do?
Causes the light to blow back into the retracted position at excessive airspeed
Where are turn off lights fitted and what do they do? [3]
- Installed in the side of the fuselage behind a flush mounted cover
- Fitted at an angle left or right of the aircraft’s axis
- Assists crew in runway and taxiway turnoffs in low visibility conditions
What do Ice Inspection lights do?
Illuminate the leading edge and sometimes engine intake lip on modern transport aircraft to allow visual inspection for ice
What 3 areas of internal lighting are there?
- Cockpit and Instrument lighting
- Cabin normal lighting
- Cargo bay lighting
When activated, what does the flight deck ‘thunderstorm switch’ do?
Overrides the dim function of all instruments and, in some cases, cockpit floodlighting and brings all lights to maximum brightness
What 3 positions can the master test switch for warning and indication lights be set to?
- TEST
- bright
- DIM
How can the master caution be cancelled?
By pressing on the light cap (so the next fault can be indicated)
What is meant by indirect lighting? (wash lighting)
The lamp is not visible to the viewer, light is reflected off adjacent surfaces to give gentler light
What areas are illuminated by emergency lighting? [3]
- Cabin
- Exits
- Escape slide
How are escape paths illuminated so passengers can see escape routes in darkness or smoke?
A system of light is installed on the floor at the edge of the escape route some are installed in seat armrests or bulkheads
What are the 3 possible positions of the emergency light switch on the flight deck or purser’s panel?
- OFF
- ON
- ARMED
How do the emergency lights operate when set to ARMED?
Lights are off during normal operation but come on in the event of aircraft power failure
How are emergency lights powered?
By there own NiCad battery packs which are constantly trickle charged during normal DC operation
In the event of DC power supply interruption, how long must the batteries keep each emergency light running for?
At least 10 minutes
