Airfield Lighting & Signaling Flashcards

What color are standard taxiway edge lights?

Answer: Blue

Taxiway edge lights are blue omnidirectional lights that distinguish taxiways from runways, which use white edge lights.

Taxiway centerline lights are what color?

Answer: Green

Taxiway centerline lights are steady green, guiding pilots along the centerline from runway exit to parking.

To activate Pilot Controlled Lighting (PCL) at the highest intensity, a pilot must click the microphone how many times within 5 seconds?

Answer: 7 clicks

Seven clicks within 5 seconds on the CTAF/UNICOM frequency activates PCL at high intensity; 5 clicks = medium, 3 clicks = low intensity.

Stop bar lights at a controlled airport are what color and orientation?

Answer: Unidirectional red lights across the taxiway

Stop bar lights are a row of unidirectional steady red lights installed across a taxiway at the runway holding position, illuminated to indicate hold short.

Runway guard lights (formerly called 'wig-wags') are used to:

Answer: Warn pilots and ground vehicles of an active runway intersection

Runway guard lights are alternating flashing yellow lights on each side of a taxiway at a runway holding position, alerting pilots and vehicle drivers of an active runway.

Lead-in lights (LDIN) are used to:

Answer: Guide aircraft along a curved or offset approach path to align with the runway

Lead-in lights are a series of flashing lights that guide aircraft from the approach fix along a curved or indirect route to align with a straight-in approach or runway.

Clearance bar lights installed on a taxiway consist of:

Answer: Three steady yellow lights across the taxiway

Clearance bar lights are three in-pavement steady yellow lights across the taxiway, installed at holding positions to increase the conspicuity of the hold short point.