radar, or ground lookout position indicates an aircraft might  be approaching the area. accommodate operations above 1,500 feet AGL. IR routes  are conducted in accordance with IFR regardless of weather  conditions. MTRs are usually indicated with a gray line on the sectional  chart. A WSC aircraft pilot flying in the area of VRs or IRs  should question the briefer during the weather brief to fi nd  out if any of the routes are in use, and a possible time frame  for opening and closing. While it is true that the WSC aircraft  pilot has the right of way, the WSC aircraft will generally  come out worse in a midair conflict with a fast-moving  military aircraft. MTRs, such as the example depicted in  Figure 8-17,  are also further defined on sectional charts. Parachute jump areas are published in the Airport/ Facility  Directory (A/FD). Sites that are used frequently are depicted  on sectional charts. Each pilot should listen to the appropriate  airport radio frequency for parachute operations and be  alert for aircraft which might be conducting parachute  operations.  Other airspace areas is a general term referring to the majority  of the remaining airspace. It includes: A local airport advisory is an area within 10 statute miles (SM)  of an airport where a control tower is not operating, but where  a flight service station (FSS) is located. At these locations,  the FSS provides advisory service to arriving and departing  aircraft. See AIM section 3-5-1 for more information on using  the local airport flight station services. National security depends largely on the deterrent effect of  our airborne military forces. To be proficient, the military  services must train in a wide range of airborne tactics. One  phase of this training involves “low level” combat tactics. The  required maneuvers and high speeds are such that they may  occasionally make the see-and-avoid aspect of VFR fl ight  more difficult without increased vigilance in areas containing  such operations. In an effort to ensure the greatest practical  level of safety for all flight operations, the Military Training  Route (MTR) program was conceived. TFRs are put into effect when traffic in the airspace would  endanger or hamper air or ground activities in the designated  area. For example, a forest fire, chemical accident, fl ood, or  disaster-relief effort could warrant a TFR, which would be  issued as a Notice to Airmen (NOTAM). The NOTAM begins  with the phrase “FLIGHT RESTRICTIONS” followed by the  location, effective time period, area defi ned in statute miles,  and altitudes affected, which aircraft flying in the area must  avoid. The NOTAM also contains the FAA coordination  facility and telephone number, the reason for the restriction,  and any other information deemed appropriate. The pilot  should check NOTAMs as part of fl ight planning. The reasons for establishing a temporary restriction are to: These routes are usually established below 10,000 feet MSL  for operations at speeds in excess of 250 knots. Some route  segments may be defined at higher altitudes for purposes of  route continuity. Routes are identified as IFR (IR), and VFR  (VR), followed by a number. MTRs with no segment above  1,500 feet AGL are identified by four numeric characters  (e.g., IR1206, VR1207). MTRs that include one or more  segments above 1,500 feet AGL are identified by three  numeric characters (e.g., IR206, VR207). IFR Low Altitude  En Route Charts depict all IR routes and all VR routes that  Figure 8-17.  MTR chart symbols.  Parachute Jump Areas  Other Airspace Areas  Local Airport Advisory  Military Training Routes (MTRs)  Temporary Flight Restrictions (TFRs) •  Airport advisory areas •  Military training routes (MTRs) • Temporary flight restrictions (TFRs) •  Terminal Radar Service Areas •  National security areas •  Protect persons and property in the air or on the surface  from an existing or imminent hazard; •  Provide a safe environment for the operation of  disaster relief aircraft; •  Prevent unsafe congestion of sightseeing aircraft  above an incident or event, which may generate a high  degree of public interest; •  Protect declared national disasters for humanitarian  reasons; 8-11