. The basic construction of a lead-acid cell consists of a positive electrode and negative electrode, each of which is made up of lead-antimony alloy grid plates.
play /ple./ noun a slightly loose fitting of engineering parts which allows them to move freely . Some play should be felt in the aileron actuator rod linkage.
. verb . to play a part to be part of a whole which has an effect on something
.
Contrast and colour play a part in identifying coastlines.
plot /pl.t/ noun a graph or diagram that shows a relationship between two sets of numbers as a series of points joined by a line . a plot of applied stress and resulting strain . verb to calculate and mark a line on a graph or chart, etc.
.
to plot a course to calculate and draw the desired route of an aircraft on a chart
plug /pl/ noun 1. a device for mak-ing an electrical connection . Alternat-ing current ground power can be fitted to an aircraft via a six-pin ground power plug. . a 3-pin plug an electrical supply plug with three electrodes: live, neutral and earth 2. a device for igniting fuel in an engine . An electric spark from an igniter plug starts combustion.
.
The fuel/air mixture is ignited by a spark plug. 3. a device to prevent liquid flowing out of a container . oil drain plug . spark plug . verb 1. . to plug a hole to fill a hole so that fluid cannot escape 2. . to plug something in to
173 polarity
make an electrical connection, often by inserting the plug on an electrical device such as a computer into an elec-trical supply socket
plunger /plnd./ noun a machine part that operates with a thrusting or plunging movement, e.g. a piston . A flow indicator valve comprises a body, a spring-loaded plunger connected to an actuator arm, and a micro-switch.
plus /pls/ preposition increased, added to . At the selected decision height plus 50 feet, an aural alert chime sounds. . Four plus four equals eight (4
+ 4 = 8).
PMS /pi em es/ abbreviation per-formance management system
pneumatic /njumt.k/ adjective
operating by means of air under pres-sure or compressed air . High-pressure pneumatic systems are generally fitted on the older types of piston-engine air-craft to operate the landing gear, wing flaps, wheel brakes.
pneumatically /njumt.kli/
adverb by using air under pressure or compressed air . Clamshell doors are hydraulically or pneumatically opened.
PNR abbreviation point of no return POB abbreviation persons on board pocket /p.k.t/ noun same as air
pocket
pod /p.d/ noun a streamlined casing or housing . The engine bay or pod is usually cooled by atmospheric air.
POH abbreviation Pilot’s Operating
Handbook point /p..nt/ noun 1. a particular fig-ure on a scale . The melting point of ice is 0°C (Celsius). 2. a particular place . a point on a map a particular place on a map 3. the sharp end of something . a pencil point . verb 1. to direct towards
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