4/20/23 

Pilot/Controller Glossary 

P 

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. 

PCG P

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