on FMR are factored in, the resulting terrain‐mitigated SDZs do not extend outside the
boundary of FMR. For example, the 2‐dimensional SDZs for .50 caliber weapons at FMR
fall outside the boundary, but the 3‐dimensional terrain‐mitigated SDZs do not. None of
the terrain‐mitigated SDZs for weapons currently used at FMR extend outside the
reservation borders. The SDZs are illustrated on Figure 3.
Explosive Safety Quantity Distance Arc
Explosive Safety Quantity Distance (ESQD) arcs encompass areas where risk has been
identified based on the potential impacts of explosives or munitions being stored in a
specific location. These arcs represent the setback distance from the ordnance storage
or handling where inhabited facilities cannot be located for safety reasons. The setback
distances are based on the quantity and type of explosives or munitions at the specified
location and represent the distance from the storage facility from which the potential for
injury and damage is greatly reduced. There are ammunition supply bunkers on the
DoD‐owned portion of FMR on the west side of SR 79. The bunkers have associated
ESQD arcs based on the type and amount of munitions stored there. As illustrated on
Figure 3, the ESQD arc extends almost to the edge of FMR’s boundary, but not beyond it.
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 4 identifies the altitude range that corresponds with each section; their
location is specified in Figure 4. R‐2310A has the largest footprint, with R‐2310B and
R‐2310C above it providing additional protected airspace when needed.
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Arizona Army National Guard Profile