1Dk4eXg

PFFT
2 Perspective [prospective is meant] frontal fighter
(US).
3 Panel fill factor.
4 Preformed fragment.
PFFT Parallel fast-Fourier transform.
PFH Per flight (or flying) hour.
PFHE Prefragmented high explosive.
PFHUD Pupil-forming head-up display.
PFI 1 Post-flight inspection (US = after-flight).
2 Private [or project] finance initiative.
PFIA Professional Flight Instructors Association
[Oxford Airport] (UK).
PFIAB President’s Foreign Intelligence Advisory
Board (US).
PFIS 1 Portable flight-inspection system.
2 Passenger flight-information system.
P 5 H 9 Pentaborane rocket fuel.
PFL Practice forced landing (A adds ‘area’).
PFLD Pilot’s fault-list display.
PFM 1 Pulse-frequency modulation.
2 Pre-flight message.
PFMA Post-flight mission analysis.
PFMGO Pre-flight message-generating officer (RAF).
PFN Pulse-forming network.
PFNA Pulsed fast-neutron analysis.
PFO Port-facing oblique.
PFP 1 Partnership for peace (NATO).
2 Proximity-fuze programmer.
3 Primary flight permit.
PFPS Portable flight-planning system.
PFQT Preliminary flight qualification test.
PFR
1 Permitted flying route (CAA).
2 Passenger flow rate.
3 Post-flight report.
4 Primary flight reference.
PFRT Preliminary flight rating test.
PFS 1 Primary flying squadron.
2 Product file sets.
3 Planetary Fourier spectrometer.
PFSV Pilot-to-forecaster service.
PFTA Payload flight-test article.
PFTI Phototelesis fast tactical imagery.
PFTS 1 Production flight-test schedule.
2 Permanent field training site.
PFU Private Finance Unit (MoD, UK).
PG, p.g. 1 Processing gain.
2 Plastic/gas.
3 Peelable graphics, esp. airline livery or logo on
aircraft.
4 Program management assistance group (USAF).
5 Photographic group (USAAF).
6 Aircraft category pursuit, ground attack (USA
1919–24); powered glider (USAAF 1943–47).
PGA 1 Pressure-garment assembly.
2 Pin grid array.
3 Proactive Green Aircraft.
PGAA Prompt gamma-ray activation analysis.
PGB 1 Precision-guided bomb.
2 Power gearbox.
PG bearing Plastic/gas, avoiding solid/solid contact.
PGCS Portable ground-control station (UAV).
PGEN Program generator (software).
PGL Private pilot, glider.
PGM 1 Precision-guided munition.
phase angle
2 Guided missile (ICBM) launched from soft pad
(DoD, obs.).
3 Precision ground map[ping].
PGMPS PGM (1) planning software.
PGN Passenger-generated noise.
PGO Foreplane, canard (R).
PGRV 1 Post-boost guided re-entry vehicle (has IMU
and TPU).
2 Precision-guided re-entry vehicle (DoD).
PGS 1 Pilot-guard system.
2 Prompt global strike.
PGSC Personnel guide surface canopy.
PGSE Peculiar (ie, to type) ground-support equipment.
PGSM Precision-guided submunition.
PGT Private pilot, gyroplane [autogyro], transition.
PH 1 Hit probability (also P H ).
2 Porte hélicoptères (F).
3 Public holiday.
4 Pacific, Hawaii (ICAO).
PHA 1 Preliminary hazard analysis.
2 Polymerized healing agent (composites).
PHAE Penetrating high-altitude endurance.
PHAK Pilot’s Handbook of Aeronautical Knowledge
(US Government).
phantom beacon R-Nav waypoint where no beacon
actually exists.
phantom contract See phantom order.
phantom drawing One using phantom lines.
phantom lines Geometrically accurate but incomplete
lines merely giving location of item or alternative
positions thereof, eg to show avionic equipment in
structural airframe drawing.
phantom member Non-existent member added in precomputer
era to assist solution of structural analysis.
phantom order Draft contract with manufacturer with
provision for preplanning immediate production in time
of crisis or conflict (DoD).
PHAR Program for harmonized air-traffic-management
research [E adds in Europe, or Eurocontrol].
Pharos Plan-handling and radar operating system.
Pharus Phased-array universal synthetic-array radar.
phase 1 In any periodic cycle, fraction of period (1)
measured from any defined reference.
2 In reactive circuit, relationship between current and
voltage.
3 In physical chemistry, distinct homogeneous physical
states separated by sharp boundaries, eg liquid/solid,
solid/solid, or immiscible liquids.
4 Periodic variation in solar illumination of Moon as
seen from Earth.
5 Normal meaning often applied to programme planning,
amphibious assault, establishment of military
government etc. In DoD, Phase 1 is concept, 2 is proof of
concept, 3 is downselect and demonstration.
phase-advance Subsystem which senses aeroplane rate
of change of pitch and triggers stick-pusher progressively
earlier as rate increases, so that pitching momentum never
takes AOA beyond prescribed limiting value.
phase angle 1 Phase (1) difference between two sets of
periodic phenomena expressed in angular measure.
2 Angle between current and voltage in rotating-vector
plot of alternating current.
3 Angle between sightlines to Sun and Earth measured
at remote locations, eg other celestial body.
492