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pneumatic altimeter
flow at low pressure to drive turbines, air motors and
cabin environmental controllers.
2 Also describes panel instruments driven by air pressure
or air-driven gyro.
pneumatic altimeter Traditional barometric altimeter.
pneumatic bearing Externally pressurized gas bearing.
pneumatic deicing Removal of ice accretion by alternate
inflation and deflation of flexible tubes along [wing or tail]
LE.
pneumatic logic That used in fluidics.
pneumatic power module Stores energy for extremely
rapid high-power release.
pneumodynamic System supplies air, or other gas, in
rapidly time-variant controlled manner.
PNF Pilot not flying, the non-handling pilot.
PNG 1 Pseudonoise generator.
2 Passive night (-vision) goggles.
PNI Pictorial navigation indicator.
PNJ Pulse(d) noise jamming.
PNL Perceived noise level (see noise).
PNLT Tone-corrected PNL.
PNM, pnm Per nautical mile. See next.
pnm Passenger nautical mile.
PNP Programmed numerical path.
PNR 1 Point of no return.
2 Prior notice required.
3 Part number.
4 Passenger name record, full details on database (US).
PNS Pictorial navigation system.
PNTR Permanent normal trade relations.
PNU Precision navigation upgrade.
PNVG Panoramic night-vision goggles.
PNVS Pilot’s night vision system, or sensor (attack helicopters).
PNWA Prevention of nuclear war agreement (1973).
PNY Portuguese navy [UK usage].
PO 1 Purchase order, or option.
2 Preposition operation(s).
3 Dust devil (from French).
P 0 static pressure [P s is preferred.
POA 1 Position of advantage (air combat).
2 Plain old Acars.
3 Pre-owened aircraft.
4 Power-optimized aircraft.
5 Production Organisation Approval[s].
POAP Photoconductor on active pixel.
POB 1 Persons, [the number] or pilot, on board.
2 Polymer optical backplane.
POBA Project for on-board autonomy (orbiter).
POC 1 Point of contact.
2 Parts obsolescence cost.
3 Professional Officer Course (ROTC).
4 Payload Operations Center (MSFC).
5 See next.
POC, PoC Proof of concept.
POCA Parting-out candidate aircraft.
POCC 1 Payload operations control center, now POC
(4).
2 Passenger operations control center [principally for
rebooking passengers who have missed connections].
pocket Short spanwise length of light trailing edge
attached to rear of helicopter rotor-blade spar, many *
being required for each blade.
POCU Pre-OCU.
point-designation grid
POD 1 Preliminary orbit determination.
2 Probability of detection.
3 Proof of design.
4 Proper orthogonal decomposition.
pod Streamlined container carried on pylon, strut or
other attachment entirely outside airframe and housing
propulsion system, reconnaissance sensors, flight-refuelling
hosereel or similar devices.
PODA Pre-operational data-link applications.
Podas Portable data-acquisition system.
podded Accommodated in pod.
podding Philosophy and technique of using pods, esp.
for accommodation of main engines.
pod formation Formation of friendly aircraft disposed
so that ECM assets give maximum mutual protection.
podium Desk for boarding agent at airport gate.
PODS, Pods 1 Portable data store.
2 Portable digitizer subsystem.
pod strike Impact of under-wing engine on runway.
POE 1 Probability of error.
2 Port [includes airfields] of embarkation.
Poems Pre-operational European Mode-S (ATC).
POES Polar-orbiting environmental satellite.
Poet 1 Portable opto-electronic tracker.
2 Primed oscillator expendable transponder.
POF Plastic optical fibre.
POFM Petrol/oil fuel mixture.
Pogo 1 See pogo effect.
2 Tail-standing VTOL (colloq.).
3 Local below-airways ATC linking Paris airports.
4 Air-intercept code: “Switch to preceding channel or,
if unable to establish communications, to next channel
after *” (DoD).
5 Mechanical link in PFCS which in case of any
jammed components automatically overrides drive cam.
6 Precision on-board GPS optimization (missile guidance).
7 Project on Government Oversight (US).
pogo effect Longitudinal oscillation or vibration, esp. of
vehicle having high ratio of thrust to mass and whose
propulsive thrust may suffer short-term variations;
characterized by significant and uncomfortable axial
accelerations and, in large ballistic rocket, severe propellant
sloshing.
pogo-stick Precisely calibrated penetrometer for
measuring strength of paved or unpaved surfaces.
POH 1 Pilot operator’s [or pilot’s operating] handbook.
2 Put on hold.
Pohwaro Pulsated overheated water rocket (FFA,
Switzerland).
POI 1 Programme of instruction.
2 Probability of intercept.
3 Point of interest.
4 Principal operations inspector (FAA).
5 Proximity orbit insertion.
Point Arguello At south Vandenberg, Western Test
Range (US).
point defence 1 Defence of specified geographical areas,
cities and vital installations; distinguishing feature is that
missile guidance radars are near launch sites (USAF).
2 Defence of single surface ship, esp. against incoming
missile.
point-designation grid Grid drawn on map or photo-
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