Federal Aviation Administration Twentieth Edition
FIG AD 1.1.9
Runway Status Light System

12.6.4.2 Operating Characteristics . Arriving Air-craft:
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 that traffic passes through the intersection, the RILs extinguish.
12.6.4.3 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 intersec-tion.
12.6.4.4 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.
12.6.4.5 The Final Approach Runway Occupancy Signal (FAROS) is activated by flashing of the Precision Approach Path Indicator (PAPI) (see FIG AD 1.1.9). 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.
 a) Operating Characteristics:
If an aircraft or surface vehicle occupies a FAROS equipped runway, the PAPI(s) on that runway will flash or pulse. 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. Some FAROS systems will flash or pulse the PAPI when traffic enters the runway whether or not there is an aircraft on approach. Others will flash the PAPI only if there is an aircraft on approach and within 1.5 nautical miles of the landing threshold.
 b) What a pilot would observe: A pilot on approach to the runway will observe the PAPI flash or pulse if there is traffic on the runway and will notice the PAPI ceases to flash or pulse when the traffic moves outside the hold short lines for the runway.

c) Whenever a pilot observes a flashing or pulsing PAPI, the pilot will verify the FAROS activation. 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 clearance is in conflict with the FAROS indication. If the PAPI continues to flash or pulse, the pilot must execute an immediate “go around” and contact ATC at the earliest possible opportunity.
12.6.5 Pilot Actions
12.6.5.1 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 which provide information to the RWSL system.
12.6.5.2 Pilots must always inform the ATCT when they have either stopped, are verifying a landing clearance, or are executing a missed approach due to RWSL or FAROS indication that are in conflict with ATC instructions. Pilots must request clarification of the taxi, takeoff, or landing clearance.
12.6.5.3 Never cross over illuminated red lights. Under normal circumstances, RWSL will confirm the pilot’s taxi or takeoff clearance. If RWSL indicates that it is unsafe to takeoff from, land on, cross, or enter a runway, immediately notify ATC of the conflict and confirm your clearance. Never land if PAPI continues to flash or pulse. Execute a go around and notify ATC.
12.6.5.4 Do not proceed when lights have extin-guished without an ATC clearance. RWSL verifies an ATC clearance, it does not substitute for an ATC clearance.
12.6.6 ATC Control of RWSL System:
12.6.6.1 Controllers can set in.pavement lights to one of five (5) brightness levels to assure maximum conspicuity under all visibility and lighting condi-tions.  REL, THL, and RIL subsystems may be independently set.
12.6.6.2 The system can be shutdown should RWSL operations impact the efficient movement of air traffic or contribute, in the opinion of the ATC Supervisor, to unsafe operations. REL, THL, RIL, and FAROS subsystems may be shutdown separately. Shutdown of the FAROS subsystem will not extinguish PAPI lights or impact its glide path
function. Whenever the system or a component is shutdown, a NOTAM must be issued, and the Automatic Terminal Information System (ATIS) must be updated.
12.7 Control of Lighting Systems
12.7.1 Operation 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.
　
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