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production base
which are identical, also called series *. With complete
aircraft successive items tend to differ in furnishing,
equipment and even engine type.
production base Total national production capacity
available for manufcture of items to meet material needs
(DoD).
production investment Funding for tooling, or the cost of
same.
production lead time Time between placing contract and
receipt of hardware; subdivided according to whether
contract is initial or reorder.
production phase Period between production approval
until last item is delivered and accepted.
productive potential Payload multiplied by range.
productivity In airline performance, traffic units (eg
LTM) generated per hour per aircraft of particular type
or per employee.
product life cycle See life cycle.
product support Assistance provided by manufacturer to
all customers throughout period of product’s use in form
of training, publications, spare parts, modification kits,
product-improvement and immediate response to
difficulties.
PROF Profile.
Profi Product, or project, financing (multinational).
proficiency student One on refresher course.
proficiency training Flight training for desk-bound
flight personnel.
profile Outline of body in side elevation; many submeanings.
Common use is to describe shape of
cross-section of wing or other aerofoil section. Outboard
* is external shape of body, esp. aircraft fuselage. Inboard
* is longitudinal cross-section showing how interior is
utilized. Flight * is orthogonal projection of flightpath on
vertical surface containing nominal track showing variation
in height (either AGL or AMSL) along straight
bottom axis representing track.
Profiledata Library of NC-machining software
(Ferranti).
profile descent Uninterrupted from TOD (1) to interception
of glide-path.
profile drag Total drag minus induced drag; sum of form
drag and surface-friction drag. One interpretation
suggests ‘drag of wing with camber and twist removed’.
profile-drag power loss That expended in overcoming
total profile drag of propeller blades.
profile line Profile of terrain, eg near airport drawn as
map inset.
profile milling Milling variable profile (surface levels) in
plate, eg in machined or integrally stiffened skin panel.
profile template Template for hand-guided machine
tool, eg router.
profile thickness Maximum distance between upper and
lower contours of aerofoil profile, each measured normal
to mean line; essentially wing thickness.
profilometer Instrument for measuring surface roughness.
PROG 1 Prognosis, prognostic, progress.
2 In particular, progress page on MCDU.
prognostic chart Forecast of meteorological elements
for specified time and location depicted graphically.
prognostics and health monitoring System assigned to
notice small change in component performance and
trigger maintenance action to prevent failure.
prohibited area
prograde Direct, or progressive orbit; satellite launched
into Earth orbit with inclination from 001° to 179°.
program 1 Vast topic, covered in EDP (1) dictionaries;
simplest definition is group of related instructions which
when followed by computer will solve a given problem.
2 Programme (US).
program acquisition unit cost Includes average procurement
unit cost plus the unit slice of the total R&D cost
since program inception. These are sunk costs, and do not
affect price paid for production aircraft (DoD).
Program Aircraft Total of active and reserve aircraft
(USAF).
programmable Capable of being controlled by different
programs by change of software.
programmable display generator Generator of 3-colour
raster formats plus calligraphic symbology, all under
variable software control.
programme Life history of major project, typified by
such * milestones as definition of requirement, feasibility
study, project definition, engineering design, hardware
manufacture/development/flight test, flight development,
service clearance (eg qualification or certification),
production, modification and product-improvement,
fault-rectification, phaseout.
program(me) element Portion of giant system (eg, SDI)
which is broken down to facilitate assignment of tasks to
companies or participating nations.
programmer Human being engaged in programming.
programmer comparator Versatile automatic testing
station providing serial evaluation of all kinds of analog
and digital signals, eg in checking avionic systems in
aircraft, missiles or spacecraft.
programming Art of preparing set of terms and instructions
which EDP (1) machine can understand and obey
and which when followed by that machine will result in
solution to problem for which program was written.
progressive burning See progressive propellant.
progressive die One which performs series of operations
(usually on sheet metal) at successive strokes of press.
progressive feel Artificial feel proportional to dynamic
pressure.
progressive orbit See prograde.
progressive powder Solid fuel, usually not gunpowder,
which burns increasingly fast as combustion pressure
increases.
progressive propellant Solid rocket-motor grain so
shaped and ignited that area of combustion, and hence
speed of burning, rate of consumption and thrust, all
increase throughout period of burn. Any radial burning
technique tends to be * unless original grain has deep star
centre such that combustion area is constant (neutural
burning).
progressive servicing Servicing performed at military
airbase where major tasks are subdivided into sections
performed at times fitting in best with operational readiness
requirements.
progressive stall Ideal stall quality where breakdown of
wing flow occurs gradually, with well-signalled symptoms;
to obtain it a breaker strip or fence may be needed.
progressive strip See Flight progress strip.
Proh, proh Prohibited.
prohibited area Airspace of defined dimensions identified
by area on surface within which flight by aircraft is
prohibited, usually for reason of national security or to
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