17 

Federal Aviation Administration, DOT 

§ 1.1 

controlled airspace and in which some 
aircraft are permitted flight under vis-
ual flight rules. 

Special VFR operations means aircraft 

operating in accordance with clear-
ances within controlled airspace in me-
teorological conditions less than the 
basic VFR weather minima. Such oper-
ations must be requested by the pilot 
and approved by ATC. 

Standard atmosphere means the at-

mosphere defined in U.S. Standard At-
mosphere, 1962 (Geopotential altitude 
tables). 

Stopway  means an area beyond the 

takeoff runway, no less wide than the 
runway and centered upon the ex-
tended centerline of the runway, able 
to support the airplane during an 
aborted takeoff, without causing struc-
tural damage to the airplane, and des-
ignated by the airport authorities for 
use in decelerating the airplane during 
an aborted takeoff. 

Suitable RNAV system is an RNAV sys-

tem that meets the required perform-
ance established for a type of oper-
ation, e.g. IFR; and is suitable for oper-
ation over the route to be flown in 
terms of any performance criteria (in-
cluding accuracy) established by the 
air navigation service provider for cer-
tain routes (e.g. oceanic, ATS routes, 
and IAPs). An RNAV system’s suit-
ability is dependent upon the avail-
ability of ground and/or satellite navi-
gation aids that are needed to meet 
any route performance criteria that 
may be prescribed in route specifica-
tions to navigate the aircraft along the 
route to be flown. Information on suit-
able RNAV systems is published in 
FAA guidance material. 

Synthetic vision means a computer- 

generated image of the external scene 
topography from the perspective of the 
flight deck that is derived from air-
craft attitude, high-precision naviga-
tion solution, and database of terrain, 
obstacles and relevant cultural fea-
tures. 

Synthetic vision system means an 

electronic means to display a synthetic 
vision image of the external scene to-
pography to the flight crew. 

Takeoff power: 
(1) With respect to reciprocating en-

gines, means the brake horsepower 
that is developed under standard sea 

level conditions, and under the max-
imum conditions of crankshaft rota-
tional speed and engine manifold pres-
sure approved for the normal takeoff, 
and limited in continuous use to the 
period of time shown in the approved 
engine specification; and 

(2) With respect to turbine engines, 

means the brake horsepower that is de-
veloped under static conditions at a 
specified altitude and atmospheric 
temperature, and under the maximum 
conditions of rotor shaft rotational 
speed and gas temperature approved for 
the normal takeoff, and limited in con-
tinuous use to the period of time shown 
in the approved engine specification. 

Takeoff safety speed means a ref-

erenced airspeed obtained after lift-off 
at which the required one-engine-inop-
erative climb performance can be 
achieved. 

Takeoff thrust, with respect to tur-

bine engines, means the jet thrust that 
is developed under static conditions at 
a specific altitude and atmospheric 
temperature under the maximum con-
ditions of rotorshaft rotational speed 
and gas temperature approved for the 
normal takeoff, and limited in contin-
uous use to the period of time shown in 
the approved engine specification. 

Tandem wing configuration means a 

configuration having two wings of 
similar span, mounted in tandem. 

TCAS I means a TCAS that utilizes 

interrogations of, and replies from, air-
borne radar beacon transponders and 
provides traffic advisories to the pilot. 

TCAS II means a TCAS that utilizes 

interrogations of, and replies from air-
borne radar beacon transponders and 
provides traffic advisories and resolu-
tion advisories in the vertical plane. 

TCAS III means a TCAS that utilizes 

interrogation of, and replies from, air-
borne radar beacon transponders and 
provides traffic advisories and resolu-
tion advisories in the vertical and hori-
zontal planes to the pilot. 

Time in service, with respect to main-

tenance time records, means the time 
from the moment an aircraft leaves the 
surface of the earth until it touches it 
at the next point of landing. 

Traffic pattern means the traffic flow 

that is prescribed for aircraft landing 
at, taxiing on, or taking off from, an 
airport. 

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