Aeronautical Information Manual (AIM), page 106

Index   105 -- Page 106 -- 107

AIM                                                                                                       12/10/15

pilot's taxi or takeoff clearance previously issued by     Automatic Terminal Information System (ATIS)
ATC. If RWSL indicates that it is unsafe to takeoff        must be updated.
from, land on, cross, or enter a runway, immediately
notify ATC of the conflict and re-confirm the              2-1-7. Stand-Alone Final Approach
clearance.                                                 Runway Occupancy Signal (FAROS)
     4. Do not proceed when lights have extin-                   a. Introduction:
guished without an ATC clearance. RWSL verifies an         The stand-alone FAROS system is a fully automated
ATC clearance; it does not substitute for an ATC           system that provides runway occupancy status to
clearance.                                                 pilots on final approach to indicate whether it may be
    5. Never land if PAPI continues to flash.              unsafe to land. When an aircraft or vehicle is detected
Execute a go around and notify ATC.                        on the runway, the Precision Approach Path Indicator
                                                           (PAPI) light fixtures flash as a signal to indicate that
  g. ATC Control of RWSL System:                           the runway is occupied and that it may be unsafe to
                                                           land. The stand-alone FAROS system is activated by
     1. Controllers can set in-pavement lights to one      localized or comprehensive sensors detecting aircraft
of five (5) brightness levels to assure maximum            or ground vehicles occupying activation zones.
conspicuity under all visibility and lighting condi-       The stand-alone FAROS system monitors specific
tions. REL, THL, and RIL subsystems may be                 areas of the runway, called activation zones, to
independently set.                                         determine the presence of aircraft or ground vehicles
                                                           in the zone (see FIG 2-1-10). These activation zones
     2. System lights can be disabled should RWSL
                                                           are defined as areas on the runway that are frequently
operations impact the efficient movement of air
                                                           occupied by ground traffic during normal airport
traffic or contribute, in the opinion of the assigned
                                                           operations and could present a hazard to landing
ATC Manager, to unsafe operations. REL, THL, RIL,
                                                           aircraft. Activation zones may include the full-length
and FAROS light fixtures may be disabled separately.
                                                           departure position, the midfield departure position, a
Disabling of the FAROS subsystem does not
                                                           frequently crossed intersection, or the entire runway.
extinguish PAPI lights or impact its glide path
function. Whenever the system or a component is            Pilots can refer to the airport specific FAROS pilot
disabled, a NOTAM must be issued, and the                  information sheet for activation zone configuration.
FIG 2-1-10 FAROS Activation Zones Clearance to land on a runway must be issued by Air control over the system and may not be able to view Traffic Control (ATC). ATC personnel have limited the FAROS signal. 2-1-10 Airport Lighting Aids

Page 106 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   105 -- Page 106 -- 107