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located along the runway centerline and are spaced at
50−foot intervals. When viewed from the landing
threshold, the runway centerline lights are white until
the last 3,000 feet of the runway. The white lights
begin to alternate with red for the next 2,000 feet, and
for the last 1,000 feet of the runway, all centerline
lights are red.
12.5.2Touchdown Zone Lights (TDZL).Touchdown
zone lights are installed on some precision
approach runways to indicate the touchdown zone
when landing under adverse visibility conditions.
They consist of two rows of transverse light bars
disposed symmetrically about the runway centerline.
The system consists of steady−burning white lights
which start 100 feet beyond the landing threshold and
extend to 3,000 feet beyond the landing threshold or
to the midpoint of the runway, whichever is less.
AIP
United States of America
AD 1.1−6
15 MAR 07
Nineteenth Edition Federal Aviation Administration
12.5.3Taxiway Centerline Lead−Off Lights.
Taxiway centerline lead−off lights provide visual
guidance to persons exiting the runway. They are
color−coded to warn pilots and vehicle drivers that
they are within the runway environment or
instrument landing system/microwave landing system
(ILS/MLS) critical area, whichever is more
restrictive. Alternate green and yellow lights are
installed, beginning with green, from the runway
centerline to one centerline light position beyond the
runway holding position or ILS/MLS critical area
holding position.
12.5.4Taxiway Centerline Lead−On Lights.
Taxiway centerline lead−on lights provide visual
guidance to persons entering the runway. These
lead−on" lights are also color−coded with the same
color pattern as lead−off lights to warn pilots and
vehicle drivers that they are within the runway
environment or instrument landing system/microwave
landing system (ILS/MLS) critical area,
whichever is more conservative. The fixtures used for
lead−on lights are bidirectional, i.e., one side emits
light for the lead−on function while the other side
emits light for the lead−off function. Any fixture that
emits yellow light for the lead−off function shall also
emit yellow light for the lead−on function.
(SeeFIG AD 1.1−9.)
12.5.5Land and Hold Short Lights.Land and
hold short lights are used to indicate the hold short
point on certain runways which are approved for
Land and Hold Short Operations (LAHSO). Land and
hold short lights consist of a row of pulsing white
lights installed across the runway at the hold short
point. Where installed, the lights will be on anytime
LAHSO is in effect. These lights will be off when
LAHSO is not in effect.
REFERENCE−
Section ENR 1.1, Paragraph 22, Pilot Responsibilities When
Conducting Land and Hold Short Operations (LAHSO).
12.6Control of Lighting Systems
12.6.1Operation of approach light systems and
runway lighting is controlled by the control tower
(ATCT). At some locations the FSS may control the
lights where there is no control tower in operation.
12.6.2Pilots may request that lights be turned on or
off. Runway edge lights, in−pavement lights and
approach lights also have intensity controls which
may be varied to meet the pilot’s request. Sequenced
flashing lights may be turned on and off. Some
sequenced flashing system also have intensity
control.
12.7Pilot Control of Airport Lighting
12.7.1Radio control of lighting is available at
selected airports to provide airborne control of lights
by keying the aircraft’s microphone. Control of
lighting system is often available at locations without
specified hours for lighting or where there is no
control tower or FSS, or when the control tower or
FSS is closed (locations with a part−time tower or
FSS). All lighting systems which are radio controlled
at an airport, whether on a single runway or multiple
runways, operate on the same radio frequency.
(See TBL AD 1.1−2 and TBL AD 1.1−3.)
12.7.2With FAA approved systems, various combinations
of medium intensity approach lights,
runway lights, taxiways lights, VASI and/or REIL
may be activated by radio control. On runways with
both approach lighting and runway lighting (runway
edge lights, taxiway lights, etc.) systems, the
approach lighting system takes precedence for
air−to−ground radio control over the runway lighting
system which is set at a predetermined intensity step,
　
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