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The intensity of solar radiation reaches
a peak around noon.  peak value maximum
value
PED PED abbreviation portable electronic
device
pedal pedal /ped(ə)l/ noun a foot-operated
lever
penalty penalty /pen(ə)lti/ noun 1. an
unwanted result of an action
The penalty
of using a circular polarisation
transmission may be some loss of definition.
2. a punishment or fine
Fuel
penalties can be incurred if fuel surplus
to requirements is carried.
penetrant penetrant /penətrənt/ noun something
which forces or gets entry into an
area or substance
Penetrant dye
inspection is a non-destructive test used
mainly for the detection of defects open
to the surface.
Penetrant oil can be
used to loosen rusty bolts, etc.
penetrate penetrate /pentret/ verb to force a
way into
Cool air from the Atlantic
can sometimes penetrate far into
Europe.
Occasionally, thunder cloud
will penetrate through the tropopause.
penetration penetration /pen|treʃ(ə)n/ noun
the act of forcing a way into or through

Long-range radars are little affected
by weather interference and have good
cloud penetration characteristics.
per per /p%, pə/ preposition for each, for
every
feet per minute (fpm)
gallons
per hour (gph)
per cent per cent /pə sent/ noun the number
out of each hundred  fifty per cent
(50%) half or ½ or 50 out of 100 
twenty-five per cent (25%) one quarter
or ¼ or 25 out of 100
percentage percentage /pə|sentd"/ noun 1. a
fraction with 100 as the understood
denominator
Volumetric efficiency is
usually expressed as a percentage. 2.
part of the total
Only a small percentage
of passengers take in the pre-departure
safety briefing.
perform perform /pə|fɔm/ verb to do
Circuit
breakers perform the same function
as a fuse.
The pilot performed a loop
to conclude his flying display.
performance performance /pə|fɔməns/ noun the
ability of a system such as an aircraft or
an engine to function as required
The
performance of the turbojet engine is
measured in thrust produced at the propelling
nozzle or nozzles.
period period /pəriəd/ noun a length of
time
a 24 hour period
a period of 3
minutes
periodic 170
periodic periodic /pəri|ɒdk/ adjective happening
from time to time or at regular
intervals, occasional  periodic maintenance
maintenance made at a particular
time interval
Periodic calibration
of ILS (instrument landing system)
installations is recommended.
peritrack peritrack /peritrk/ noun same as
taxiway
permanent permanent /p%mənənt/ adjective
lasting or remaining without change 
permanent deformation damage to a
structure which must be repaired by
replacing the damaged part  permanent
magnet a metal component which
always has a magnetic influence. Opposite
temporary
permissible permissible /pə|msb(ə)l/ adjective
allowable, not prohibited
Great care
must be taken to ensure that the aircraft
operates within regulated or permissible
weight limits.
permission permission /pə|mʃ(ə)n/ noun consent
or authorisation
A passenger who
is drunk can be refused permission to
board the aircraft.
permit permit noun /p%mt/ a document or
pass that is proof of official permission
to do or have something
You need a
permit to enter the restricted area. 
verb /pə|mt/ to allow
When oxygen
mask are pulled down to the usable
position, valves are opened which permit
oxygen to flow.
Information
passed to the operations department
will be sufficient to permit the flight to
be planned.
Permit to Fly Permit to Fly /p%mt tə fla/ noun
a certificate issued by the Civil Aviation
Authority in the UK for aircraft which
do not qualify for a Certificate of Airworthiness
perpendicular perpendicular /p%pən|dkjυlə/
adjective at right angles or 90° to a base
or a line
The vertical grid lines are
perpendicular to the horizontal ones.

The air is acted upon by a force perpendicular
to the isobars in the direction of
low pressure.
persist persist /pə|sst/ verb 1. to continue to
exist
Snow cover tends to persist on
north-facing slopes of mountains. 2. to
continue without giving up
She persisted
　
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本文鏈接地址：Dictionary of Aviation下(34)