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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