11.14 Lights

Question 1

Which 3 categories can lighting loosely be divided into?

Answer 1

• Internal
• External
• Emergency

Question 2

Where is the Red Navigation light visible from?

Answer 2

A point directly ahead round to 110 degrees to the left side

Question 3

Where is the Green navigation light visible from?

Answer 3

A point directly ahead round 110 degrees to the right of the aircraft

Question 4

Where is the White navigation light visible from?

Answer 4

A point directly to the rear of the aircraft round 70 degrees to the left and right

Question 5

What power are navigation lights normally supplied with?

Answer 5

28v AC or DC (Some aircraft have both)

Question 6

Where are the flashing Anti-collision lights located?

Answer 6

On the top and bottom of the fuselage

Question 7

What is the typical flashing frequency of strobe lighting?

Answer 7

60-70 flashes per minute

Question 8

What is the stroboscopic effect?

Answer 8

Occurs after exposure to strobe lighting. Makes a moving/rotating object appear stationary, can induce epileptic fits

Question 9

What are 3 typical locations for landing lamps

Answer 9

• Wing leading edges
• Undercarriage legs
• Flap track fairings

Question 10

What are the two types of landing light units?

Answer 10

• Fixed

- Retractable

Question 11

What is the initial surge current for Landing lights?

Answer 11

15x the normal value

Question 12

What cautionary measure is in place due to landing lamp systems heating up?

Answer 12

A time limit of operation on the ground with no cooling airflow

Question 13

What does the clutch on the Retractable landing light system do?

Answer 13

Causes the light to blow back into the retracted position at excessive airspeed

Question 14

Where are turn off lights fitted and what do they do? [3]

Answer 14

• 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

Question 15

What do Ice Inspection lights do?

Answer 15

Illuminate the leading edge and sometimes engine intake lip on modern transport aircraft to allow visual inspection for ice

Question 16

What 3 areas of internal lighting are there?

Answer 16

• Cockpit and Instrument lighting
• Cabin normal lighting
• Cargo bay lighting

Question 17

When activated, what does the flight deck ‘thunderstorm switch’ do?

Answer 17

Overrides the dim function of all instruments and, in some cases, cockpit floodlighting and brings all lights to maximum brightness

Question 18

What 3 positions can the master test switch for warning and indication lights be set to?

Answer 18

• TEST
• bright
• DIM

Question 19

How can the master caution be cancelled?

Answer 19

By pressing on the light cap (so the next fault can be indicated)

Question 20

What is meant by indirect lighting? (wash lighting)

Answer 20

The lamp is not visible to the viewer, light is reflected off adjacent surfaces to give gentler light

Question 21

What areas are illuminated by emergency lighting? [3]

Answer 21

• Cabin
• Exits
• Escape slide

Question 22

How are escape paths illuminated so passengers can see escape routes in darkness or smoke?

Answer 22

A system of light is installed on the floor at the edge of the escape route some are installed in seat armrests or bulkheads

Question 23

What are the 3 possible positions of the emergency light switch on the flight deck or purser’s panel?

Answer 23

• OFF
• ON
• ARMED

Question 24

How do the emergency lights operate when set to ARMED?

Answer 24

Lights are off during normal operation but come on in the event of aircraft power failure

Question 25

How are emergency lights powered?

Answer 25

By there own NiCad battery packs which are constantly trickle charged during normal DC operation

Question 26

In the event of DC power supply interruption, how long must the batteries keep each emergency light running for?

Answer 26

At least 10 minutes