Figure 8-13. Prohibited area in Washington, D.C., on a sectional  chart. Figure 8-12.  Example of the additional information provided on sectional charts for special use airspace. are established for security or other reasons associated with  the national welfare. These areas are published in the Federal  Register and are depicted on sectional charts. The area is  charted as a “P” followed by a number (e.g., “P-56 A and  B”).  [Figure 8-13]  agency may be extremely hazardous to the aircraft and its  occupants. ATC facilities apply the following procedures:  Restricted areas are charted with an “R” followed by a number  (e.g., “R-4803 and R-4810”) and are depicted on the sectional  charts.  [Figure 8-14]  Restricted areas are areas where operations are hazardous to  nonparticipating aircraft and contain airspace within which  the flight of aircraft, while not wholly prohibited, is subject  to restrictions. Activities within these areas must be confi ned  because of their nature, or limitations may be imposed upon  aircraft operations that are not a part of those activities, or  both. Restricted areas denote the existence of unusual, often  invisible, hazards to aircraft (e.g., artillery fi ring, aerial  gunnery, or guided missiles). Penetration of restricted areas  is illegal without authorization from the using or controlling  Warning areas consist of airspace which may contain hazards  to nonparticipating aircraft in international airspace. The  activities may be much the same as those for a restricted  area. Warning areas are established beyond the three mile  limit and are depicted on sectional charts.  MOAs consist of airspace of defined vertical and lateral limits  established for the purpose of separating certain military  training activity from IFR traffic. There is no restriction  against a pilot operating VFR in these areas; however, a  pilot should be alert since training activities may include  acrobatic and abrupt maneuvers. MOAs are depicted by  name and with defined boundaries on sectional, VFR terminal  area, and en route low altitude charts and are not numbered  (e.g., “CHURCHILL HIGH MOA,” “CHURCHILL LOW   Restricted Areas  Military Operations Areas (MOAs)  Warning Areas 2. If the restricted area is active and has not been released  to the FAA, the ATC facility will issue a clearance  which will ensure the aircraft avoids the restricted  airspace. 1.  If the restricted area is not active and has been released  to the Federal Aviation Administration (FAA), the  ATC facility will allow the aircraft to operate in the  restricted airspace without issuing specifi c clearance  for it to do so. 8-9