Restricted Airspace
Restricted airspace designates areas where ongoing or intermittent activities create
frequent and often invisible hazards to aircraft. Restricted airspace is specifically
designated where flight or ground activities must be confined as they could be
considered hazardous to non‐participating aircraft, such as commercial and/or general
aviation aircraft. Restricted airspace is bounded by a floor (the minimum altitude a plane
can fly) and a ceiling (the maximum altitude a plane can fly). Restricted airspace is
designated under 14 Code of Federal Regulations (CFR) Part 73 and is utilized for
activities such as weapons firing, hazardous flight activity, and aircraft testing, including
high speed maneuvering, abrupt altitude changes, and other dynamic, non‐standard
aircraft activity, such as unmanned aerial system operations.
The restricted airspace above Florence Military Reservation is separated into three
different sections. These three sections are called R‐2310A, R‐2310B, and R‐2310C.
Restrictions can be activated during live‐fire weapons training activities to protect aircraft
by excluding them from the area where weapons firing is occurring. They can also be put
in place during training of unmanned aerial systems, so they do not interfere with other
aircraft. Table 3‐3 identifies the altitude range that corresponds with each section; their
location is specified in Figure 3‐8. R‐2310A has the largest footprint, with R‐2310B and
R‐2310C above it providing additional protected airspace when needed.
Table 3-3 Florence Military Reservation Restricted Airspace Floors and
Ceilings
Restricted Airspace Minimum Altitude
(mean sea level) Maximum Altitude
(mean sea level)
Effective Times
of Use
R‐2310A Surface 10,000 feet Intermittent, by
Notice to Airmen 48
hours in advance.
R‐2310B 10,000 feet 17,000 feet Intermittent, by
Notice to Airmen 48
hours in advance.
R‐2310 C 17,000 feet 35,000 feet Intermittent, by
Notice to Airmen 48
hours in advance.
Source: Federal Aviation Administration‐Aeronautical Information Services, October 2017
Background Report
3-23