Definitions - Continued

DOE-STD-3014-96

Exposure Screening: A preliminary conservative estimate of the potential offsite effects from

an aircraft crash impact that allows all identified hazardous chemical and radioactive materials

to be released. Facilities meeting recommended guidelines do not have to be evaluated in

terms of aircraft impact frequency analysis.

Facility: As used in this standard, an area of interest for the purpose of performing aircraft

crash impact analysis involving either individual structures or buildings; portions of structures or

buildings (such as critical structures, systems, and components [SSCs]); or a multibuilding or

multistructure conglomeration such as a storage tank farm or munition magazine complex. The

facility should be defined as the collection of such structures that could be affected by a single

aircraft impact.

Fatal Injury: As defined by the NTSB, any injury that results in death within 30 days after the

accident.

Flight Phase: The portions of an aircraft flight that are distinctly different due to the

configuration of the aircraft and/or the conditions under which the flight is taking place. In

general, there are seven distinct phases per flight. These are: takeoff roll, initial climb, climb to

cruise, cruise/in-flight, descent from cruise, approach, and landing roll. For this standard, the

seven phases were grouped into three main flight phases:

Takeoff phase, which includes the takeoff roll and the initial climb;

In-flight phase, which includes the climb to cruise, cruise/in-flight, and the descent

from cruise; and

Landing phase, which includes the landing approach and the landing roll.

Flight Source: An aircraft activity (e.g., either airport operations or nonairport operations) that

is assumed to contribute to the overall aircraft crash impact frequency and, thus, is included in

the analysis. This standard addresses two types of flight source: (1) airport operations and

(2) in-flight or nonairport activities, including the special case of deliberate overflights involving

observation and local operations aircraft. For example, if there are three airports within the

distance inclusion criteria, then there are four flight sources to be included in the analysis (three

airport sources and one nonairport source).