Section 170.3

14 CFR Ch. I (1-1-19 Edition)

Control Tower - See Airport Traffic
Control Tower.
Criteria means the standards used by
the FAA for the determination of establishment or discontinuance of a
service or facility at an airport.
Departure means any aircraft taking
off from an airport.
Discontinuance means the withdrawal
of a service and/or facility from an airport.
Establishment means the provision of
a service or facility at a candidate airport.
Instrument approach means a series of
predetermined maneuvers for the orderly transfer of an aircraft under instrument flight conditions from the beginning of the initial approach to a
landing, or to a point from which a
landing may be made visually. It is
prescribed and approved for a specific
airport by competent authority.
Instrument flight rules (IFR) means
rules governing the procedures for conducting flight under instrument meteorological conditions (IMC) instrument
flight.
Instrument landing system (ILS) means
an instrument landing system whereby
the pilot guides his approach to a runway solely by reference to instruments
in the cockpit. In some instances, the
signals received from the ground can be
fed into the automatic pilot for automatically controlled approaches.
Instrument meteorological conditions
(IMC) means weather conditions below
the minimums prescribed for flight
under Visual Flight Rules (VFR).
Instrument operation means an aircraft operation in accordance with an
IFT flight plan or an operation where
IFR separation between aircraft is provided by a terminal control facility or
air
route
traffic
control
center
(ARTCC).
Life cycle benefits means the value of
services provided to aviation users over
the life span of a facility or service.
Life cycle costs means the value of research and development costs, investment costs, operation costs, maintenance costs, and termination costs
over the life span of a facility or service.
Maintenance costs means the costs incurred in servicing and maintaining a
facility after establishment.

Mean sea level (MSL) means the base
commonly used in measuring altitudes.
Microwave landing system (MLS)
means a landing system which enables
equipped aircraft to make curved and
closely spaced approaches to properly
instrumented airports.
Noncommercial traffic means all aircraft operations that are conducted
free of compensation.
Nonprecision
approach
procedure
means an FAA standard for approaching an IFR runway where no electronic
glide slope is available.
Nonscheduled commercial service means
the carriage by aircraft in air commerce of persons or property for compensation or hire that are not operated
in regularly scheduled service such as
charter flights.
Present value (PV) means the value of
a stream of future benefits or costs
that are discounted to the present.
PVB or BPV means the discounted
value of life cycle benefits.
PVC or CPV means the discounted
value of life cycle benefits.
PVCM or CMPV means the discounted value of operations and maintenance costs less termination costs
over a facility-s remaining life cycle.
Runway means a defined rectangular
area on a land airport prepared for the
landing and takeoff of aircraft along
its length.
Runway visual range means an instrumentally derived value based on standard calibrations that represent the horizontal distance a pilot will see down
the runway from the approach end.
Scheduled commercial service means
the carriage by aircraft in air commerce under parts 121 and 135 of persons or property for compensation or
hire based on published flight schedules.
Separation means the spacing of aircraft in flight and while landing and
taking off to achieve their safe and orderly movement.
Takeoff clearance means authorization by an airport traffic control tower
for an aircraft to take off.
Tower cab means an ATC facility located at an airport. Controllers at
these facilities direct ground traffic,
takeoffs, and landings.
Traffic advisories means advisories
issued to alert pilots to other known or

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