Pilot/Controller Glossary Pilot/Controller Glossary  8/15/19 1/30/20  RUNWAY CONDITION REPORT (RwyCR)- A  data collection worksheet used by airport operators  that correlates the runway percentage of coverage  along with the depth and type of contaminant for the  purpose of creating a FICON NOTAM.  (See RUNWAY CONDITION CODES.)  RUNWAY END IDENTIFIER LIGHTS (REIL)- (See AIRPORT LIGHTING.)  RUNWAY ENTRANCE LIGHTS (REL)-An array  of red lights which include the first light at the hold  line followed by a series of evenly spaced lights to the  runway edge aligned with the taxiway centerline, and  one additional light at the runway centerline in line  with the last two lights before the runway edge.  RUNWAY GRADIENT- The average slope, mea- sured in percent, between two ends or points on a  runway. Runway gradient is depicted on Government  aerodrome sketches when total runway gradient  exceeds 0.3%.  RUNWAY HEADING- The magnetic direction that  corresponds with the runway centerline extended, not  the painted runway number. When cleared to “fly or  maintain runway heading,” pilots are expected to fly  or maintain the heading that corresponds with the  extended centerline of the departure runway. Drift  correction shall not be applied; e.g., Runway 4, actual  magnetic heading of the runway centerline 044, fly  044.  RUNWAY IN USE/ACTIVE RUNWAY/DUTY  RUNWAY- Any runway or runways currently being  used for takeoff or landing. When multiple runways  are used, they are all considered active runways. In  the metering sense, a selectable adapted item which  specifies the landing runway configuration or  direction of traffic flow. The adapted optimum flight  plan from each transition fix to the vertex is  determined by the runway configuration for arrival  metering processing purposes.  RUNWAY LIGHTS- (See AIRPORT LIGHTING.)  RUNWAY MARKINGS- (See AIRPORT MARKING AIDS.)  RUNWAY OVERRUN- In military aviation exclu- sively, a stabilized or paved area beyond the end of a  runway, of the same width as the runway plus  shoulders, centered on the extended runway  centerline.  RUNWAY PROFILE DESCENT- An instrument  flight rules (IFR) air traffic control arrival procedure  to a runway published for pilot use in graphic and/or  textual form and may be associated with a STAR.  Runway Profile Descents provide routing and may  depict crossing altitudes, speed restrictions, and  headings to be flown from the en route structure to the  point where the pilot will receive clearance for and  execute an instrument approach procedure. A  Runway Profile Descent may apply to more than one  runway if so stated on the chart.  (Refer to AIM.)  RUNWAY SAFETY AREA- A defined surface  surrounding the runway prepared, or suitable, for  reducing the risk of damage to airplanes in the event  of an undershoot, overshoot, or excursion from the  runway. The dimensions of the RSA vary and can be  determined by using the criteria contained within  AC 150/5300-13, Airport Design, Chapter 3.  Figure 3-1 in AC 150/5300-13 depicts the RSA. The  design standards dictate that the RSA shall be:  a.  Cleared, graded, and have no potentially  hazardous ruts, humps, depressions, or other surface  variations;  b.  Drained by grading or storm sewers to prevent  water accumulation;  c.  Capable, under dry conditions, of supporting  snow removal equipment, aircraft rescue and  firefighting equipment, and the occasional passage of  aircraft without causing structural damage to the  aircraft; and,  d.  Free of objects, except for objects that need to  be located in the runway safety area because of their  function. These objects shall be constructed on low  impact resistant supports (frangible mounted struc- tures) to the lowest practical height with the frangible  point no higher than 3 inches above grade.  (Refer to AC 150/5300-13, Airport Design,  Chapter 3.)  RUNWAY STATUS LIGHTS (RWSL) SYSTEM- The RWSL is a system of runway and taxiway  lighting to provide pilots increased situational  awareness by illuminating runway entry lights (REL)  when the runway is unsafe for entry or crossing, and  take-off hold lights (THL) when the runway is unsafe  for departure.  PCG R-7 