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Pilot/Controller Glossary

P TIME

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(See PROPOSED DEPARTURE TIME.)

P-ACP

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(See PREARRANGED COORDINATION PROCEDURES.)

PAN-PAN

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 The international radio-telephony urgency signal. When repeated three
times, indicates uncertainty

or alert followed by the nature of the urgency.

(See MAYDAY.)
(Refer to AIM.)

PAO

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(See PUBLIC AIRCRAFT OPERATION.)

PAR

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(See PRECISION APPROACH RADAR.)

PAR [ICAO]

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(See ICAO Term PRECISION APPROACH RADAR.)

PARALLEL ILS APPROACHES

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 Approaches to parallel runways
by IFR aircraft which, when established

inbound toward the airport on the adjacent final approach courses, are
radar-separated by at least 2 miles.

(See FINAL APPROACH COURSE.)
(See SIMULTANEOUS ILS APPROACHES.)

PARALLEL OFFSET ROUTE

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 A parallel track to the left or right of the designated or established
airway/route.

Normally associated with Area Navigation (RNAV) operations.

(See AREA NAVIGATION.)

PARALLEL RUNWAYS

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Two or more runways at the same airport whose centerlines are parallel.
In addition

to runway number, parallel runways are designated as L (left) and R
(right) or, if three parallel runways exist,

L (left), C (center), and R (right).
PBCT

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(See PROPOSED BOUNDARY CROSSING TIME.)

PBN

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(See ICAO Term PERFORMANCE

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BASED NAVIGATION.)

PDC

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(See PRE

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DEPARTURE CLEARANCE.)

PDRR

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(See PRE

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DEPARTURE REROUTE.)

PERFORMANCE

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BASED NAVIGATION (PBN) [ICAO]

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Area navigation based on performance

requirements for aircraft operating along an ATS route, on an
instrument approach procedure or in a designated

airspace.

Note: Performance requirements are expressed
in navigation specifications (RNAV specification, RNP

specification) in terms of accuracy, integrity,
continuity, availability, and functionality needed for the proposed

operation in the context of a particular airspace concept.

PERMANENT ECHO

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 Radar signals reflected from fixed objects on the earth's surface;
e.g., buildings, towers,

terrain. Permanent echoes are distinguished from "ground clutter" by
being definable locations rather than large

areas. Under certain conditions they may be used to check radar
alignment.

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