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AIM

10/12/17

2

−1−9

Airport Lighting Aids

continuing the takeoff is unsafe. Contact ATC at the
earliest possible opportunity.

d.

Runway Intersection Lights (RIL): The RIL

system is composed of flush mounted, in

−pavement,

unidirectional light fixtures in a double longitudinal
row aligned either side of the runway centerline
lighting in the same manner as THLs. Their
appearance to a pilot is similar to that of THLs.
Fixtures are focused toward the arrival end of the
runway, and they extend for 3,000 feet in front of an
aircraft that is approaching an intersecting runway.
They end at the Land and Hold Short Operation
(LASHO) light bar or the hold short line for the
intersecting runway.

1.

RIL Operating Characteristics 

− Departing

Aircraft:

RILs will illuminate for an aircraft departing or in
position to depart when there is high speed traffic
operating on the intersecting runway (see
FIG 2

−1−9). Note that there must be an aircraft or

vehicle in a position to observe the RILs for them to
illuminate. Once the conflicting traffic passes
through the intersection, the RILs extinguish.

2.

RIL Operating Characteristics 

− Arriving

Aircraft:

RILs will illuminate for an aircraft that has landed and
is rolling out when there is high speed traffic on the
intersecting runway that is $5 seconds of meeting at
the intersection. Once the conflicting traffic passes
through the intersection, the RILs extinguish.

3.

What a pilot would observe: A pilot departing

or arriving will observe RILs illuminate in reaction to
the high speed traffic operation on the intersecting
runway. The lights will extinguish when that traffic
has passed through the runway intersection.

4.

Whenever a pilot observes the red light of the

RIL array, the pilot will stop before the LAHSO stop
bar or the hold line for the intersecting runway. If a
departing aircraft is already at high speed in the
takeoff roll when the RILs illuminate, it may be
impractical to stop for safety reasons. The crew
should safely operate according to their best
judgment while understanding the illuminated lights
indicate that continuing the takeoff is unsafe. Contact
ATC at the earliest possible opportunity.

e.

The Final Approach Runway Occupancy Signal

(FAROS) is communicated by flashing of the
Precision Approach Path Indicator (PAPI) (see FIG
2-1-9). When activated, the light fixtures of the PAPI
flash or pulse to indicate to the pilot on an approach
that the runway is occupied and that it may be unsafe
to land.

NOTE

FAROS is an independent automatic alerting system that
does not rely on ATC control or input.

1.

FAROS Operating Characteristics:

If an aircraft or surface vehicle occupies a FAROS
equipped runway, the PAPI(s) on that runway will
flash. The glide path indication will not be affected,
and the allotment of red and white PAPI lights
observed by the pilot on approach will not change.
The FAROS system will flash the PAPI when traffic
enters the runway and there is an aircraft on approach
and within 1.5 nautical miles of the landing threshold.

2.

What a pilot would observe: A pilot on

approach to the runway will observe the PAPI flash if
there is traffic on the runway and will notice the PAPI
ceases to flash when the traffic moves outside the
hold short lines for the runway.

3.

When a pilot observes a flashing PAPI at 500

feet above ground level (AGL), the contact height,
the pilot must look for and acquire the traffic on the
runway. At 300 feet AGL, the pilot must contact ATC
for resolution if the FAROS indication is in conflict
with the clearance. If the PAPI continues to flash, the
pilot must execute an immediate “go around” and
contact ATC at the earliest possible opportunity.

f.

Pilot Actions:

1.

When operating at airports with RWSL, pilots

will operate with the transponder “On” when
departing the gate or parking area until it is shutdown
upon arrival at the gate or parking area. This ensures
interaction with the FAA surveillance systems such
as ASDE-X/Airport Surface Surveillance Capability
(ASSC) which provide information to the RWSL
system.

2.

Pilots must always inform the ATCT when

they have either stopped, are verifying a landing
clearance, or are executing a go-around due to RWSL
or FAROS indication that are in conflict with ATC
instructions. Pilots must request clarification of the
taxi, takeoff, or landing clearance.