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Pilot/Controller Glossary

3/29/18

PCG R

−5

a filed IFR flight plan has been revised by the pilot,
company, or operations prior to departure.

REQUIRED NAVIGATION PERFORMANCE
(RNP)– A statement of the navigational performance
necessary for operation within a defined airspace.
The following terms are commonly associated with
RNP:

a.

Required Navigation Performance Level or

Type (RNP-X). A value, in nautical miles (NM), from
the intended horizontal position within which an
aircraft would be at least 95-percent of the total flying
time.

b.

Required Navigation Performance (RNP)

Airspace. A generic term designating airspace,
route(s), leg(s), operation(s), or procedure(s) where
minimum required navigational performance (RNP)
have been established.

c.

Actual Navigation Performance (ANP). A

measure of the current estimated navigational
performance. Also referred to as Estimated Position
Error (EPE).

d.

Estimated Position Error (EPE). A measure of

the current estimated navigational performance. Also
referred to as Actual Navigation Performance (ANP).

e.

Lateral Navigation (LNAV). A function of area

navigation (RNAV) equipment which calculates,
displays, and provides lateral guidance to a profile or
path.

f.

Vertical Navigation (VNAV). A function of area

navigation (RNAV) equipment which calculates,
displays, and provides vertical guidance to a profile
or path.

RESCUE COORDINATION CENTER (RCC)

−  A

search and rescue (SAR) facility equipped and
manned to coordinate and control SAR operations in
an area designated by the SAR plan. The U.S. Coast
Guard and the U.S. Air Force have responsibility for
the operation of RCCs.

(See ICAO term RESCUE CO-ORDINATION

CENTRE.)

RESCUE CO-ORDINATION CENTRE [ICAO]

− A

unit responsible for promoting efficient organization
of search and rescue service and for coordinating the
conduct of search and rescue operations within a
search and rescue region.

RESOLUTION ADVISORY

− A display indication

given to the pilot by the Traffic alert and Collision

Avoidance System (TCAS II) recommending a
maneuver to increase vertical separation relative to an
intruding aircraft. Positive, negative, and vertical
speed limit (VSL) advisories constitute the resolution
advisories. A resolution advisory is also classified as
corrective or preventive.

RESTRICTED AREA

(See SPECIAL USE AIRSPACE.)
(See ICAO term RESTRICTED AREA.)

RESTRICTED AREA [ICAO]

− An airspace of

defined dimensions, above the land areas or territorial
waters of a State, within which the flight of aircraft
is restricted in accordance with certain specified
conditions.

RESUME NORMAL SPEED

 Used by ATC to

advise a pilot to resume an aircraft’s normal operating
speed. It is issued to terminate a speed adjustment
where no published speed restrictions apply. It does
not delete speed restrictions in published procedures
of upcoming segments of flight. This does not relieve
the pilot of those speed restrictions that are applicable
to 14 CFR Section 91.117.

RESUME OWN NAVIGATION

− Used by ATC to

advise a pilot to resume his/her own navigational
responsibility. It is issued after completion of a radar
vector or when radar contact is lost while the aircraft
is being radar vectored.

(See RADAR CONTACT LOST.)
(See RADAR SERVICE TERMINATED.)

RESUME PUBLISHED SPEED

 Used by ATC to

advise a pilot to resume published speed restrictions
that are applicable to a SID, STAR, or other
instrument procedure. It is issued to terminate a speed
adjustment where speed restrictions are published on
a charted procedure.

RMI

(See RADIO MAGNETIC INDICATOR.)

RNAV

(See AREA NAVIGATION (RNAV).)

RNAV APPROACH

− An instrument approach

procedure which relies on aircraft area navigation
equipment for navigational guidance.

(See AREA NAVIGATION (RNAV).)
(See INSTRUMENT APPROACH

PROCEDURE.)

ROAD RECONNAISSANCE (RC)

− Military activ-

ity requiring navigation along roads, railroads, and