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AIM

10/12/17

2−1−15

Airport Lighting Aids

b. The colors and color combinations of beacons

are:

1. White and Green− Lighted land airport.
2. *Green alone− Lighted land airport.
3. White and Yellow− Lighted water airport.
4. *Yellow alone− Lighted water airport.
5. Green, Yellow, and White− Lighted heliport.

NOTE−

*Green alone or yellow alone is used only in connection

with a white−and−green or white−and−yellow beacon

display, respectively.

c. Military airport beacons flash alternately white

and green, but are differentiated from civil beacons

by dualpeaked (two quick) white flashes between the

green flashes.

d. In Class B, Class C, Class D and Class E surface

areas, operation of the airport beacon during the hours

of daylight often indicates that the ground visibility

is less than 3 miles and/or the ceiling is less than

1,000 feet. ATC clearance in accordance with

14 CFR Part 91 is required for landing, takeoff and

flight in the traffic pattern. Pilots should not rely

solely on the operation of the airport beacon to

indicate if weather conditions are IFR or VFR. At

some locations with operating control towers, ATC

personnel turn the beacon on or off when controls are

in the tower. At many airports the airport beacon is

turned on by a photoelectric cell or time clocks and

ATC personnel cannot control them. There is no

regulatory requirement for daylight operation and it

is the pilot’s responsibility to comply with proper

preflight planning as required by 14 CFR

Section 91.103.

2−1−11. Taxiway Lights

a. Taxiway Edge Lights. Taxiway edge lights are

used to outline the edges of taxiways during periods

of darkness or restricted visibility conditions. These

fixtures emit blue light.

NOTE−

At most major airports these lights have variable intensity

settings and may be adjusted at pilot request or when

deemed necessary by the controller.

b. Taxiway Centerline Lights. Taxiway center-

line lights are used to facilitate ground traffic under

low visibility conditions. They are located along the

taxiway centerline in a straight line on straight

portions, on the centerline of curved portions, and

along designated taxiing paths in portions of

runways, ramp, and apron areas. Taxiway centerline

lights are steady burning and emit green light.

c. Clearance Bar Lights. Clearance bar lights

are installed at holding positions on taxiways in order

to increase the conspicuity of the holding position in

low visibility conditions. They may also be installed

to indicate the location of an intersecting taxiway

during periods of darkness. Clearance bars consist of

three in−pavement steady−burning yellow lights.

d. Runway Guard Lights. Runway guard lights

are installed at taxiway/runway intersections. They

are primarily used to enhance the conspicuity of

taxiway/runway intersections during low visibility

conditions, but may be used in all weather conditions.

Runway guard lights consist of either a pair of

elevated flashing yellow lights installed on either side

of the taxiway, or a row of in−pavement yellow lights

installed across the entire taxiway, at the runway

holding position marking.

NOTE−

Some airports may have a row of three or five in−pavement

yellow lights installed at taxiway/runway intersections.

They should not be confused with clearance bar lights

described in paragraph 2−1−11 c, Clearance Bar Lights.

e. Stop Bar Lights. Stop bar lights, when

installed, are used to confirm the ATC clearance to

enter or cross the active runway in low visibility

conditions (below 1,200 ft Runway Visual Range). A

stop bar consists of a row of red, unidirectional,

steady−burning in−pavement lights installed across

the entire taxiway at the runway holding position, and

elevated steady−burning red lights on each side. A

controlled stop bar is operated in conjunction with the

taxiway centerline lead−on lights which extend from

the stop bar toward the runway. Following the ATC

clearance to proceed, the stop bar is turned off and the

lead−on lights are turned on. The stop bar and lead−on

lights are automatically reset by a sensor or backup

timer.

CAUTION−

Pilots should never cross a red illuminated stop bar, even

if an ATC clearance has been given to proceed onto or

across the runway.
NOTE−

If after crossing a stop bar, the taxiway centerline lead−on

lights inadvertently extinguish, pilots should hold their

position and contact ATC for further instructions.