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change direction
a reversible electric
motor
reversible pitch propeller reversible pitch propeller /r|
v%səb(ə)l ptʃ prə|pelə/ noun a propeller
which allows the aircraft to be
propelled backwards when taxiing
reversion reversion /r|v%ʃ(ə)n/ noun a return
to an earlier condition or state
In
smaller aircraft, reversion to manual
197 RIS
control is possible if complete loss of
hydraulic power occurs.
revert revert /r|v%t/ verb to return to an earlier
condition or state
The elevator
system has the ability to revert to manual
control after a hydraulic failure.
revolution revolution /revə|luʃ(ə)n/ noun a
rotation or turn about an axis  a revolution
of the crankshaft a 360° turn of
the crankshaft
revolutions per minute revolutions per minute
/revəluʃ(ə)nz pə mnt/ noun the
speed of an engine or the number of
rotations of the crankshaft per minute

Rpm is the number of revolutions per
minute that the engine crankshaft is
making.
The actuator control is sensitive
to engine rpm. Abbreviation rpm,
r.p.m.
revolve revolve /r|vɒlv/ verb to turn about an
axis
The Earth revolves around the
sun.
revolving revolving /r|vɒlvŋ/ adjective 
tropical revolving storm an intense
depression of a kind that can develop
over tropical oceans
Tropical revolving
storms originate within 5–15° of the
equator.
Tropical revolving storms
generally occur from June to October.
rhumb rhumb /rm/ noun one of the points of
a compass
rhumb line rhumb line /rm lan/ noun 1. a regularly
curved line on the surface of the
Earth which cuts all meridians at the
same angle 2. a steady course taken by
aircraft along one compass bearing
rhumb line direction rhumb line direction /rm lan
da|rekʃ(ə)n/ noun the average of all
the great circle directions between the
two points
Because the great circle
direction between two points on the surface
of the Earth is not constant, it is
often more convenient to consider the
rhumb line direction.
rib rib /rb/ noun one of many cross pieces
of the airframe that provide an aircraft
wing with shape and strength
Additional
strength is required for the rib
sections which are placed in the area of
the undercarriage mountings, flaps and
power plant attachment point.
rich rich /rtʃ/ adjective referring to a mixture
in which the ratio of fuel to air is
greater than usual
Moving the mixture
control lever forward to the rich position
increases the amount of fuel mixing
with the air.
rich mixture rich mixture /rtʃ mkstʃə/ noun a
fuel/air mixture in which the proportion
of fuel is greater than normal
ridge ridge /rd"/ noun 1. a long narrow hill
with a crest
The mountain ridge
stretches for miles. 2. a long zone of relatively
high atmospheric pressure
a
ridge of high pressure
On average, the
wind backs with the passage of a ridge.
ridge waves ridge waves /rd" wevz/ plural
noun oscillations about the stable state
of the undisturbed air flow with the
range of hills providing the disturbance
rigging position rigging position /r$ŋ pə|zʃ(ə)n/
noun an attitude of the aircraft in which
the lateral axis and usually the longitudinal
axis are horizontal
The aircraft
was put into the rigging position.
rigid rigid /rd"d/ adjective unbending,
inflexible
The areas between the ribs
are utilised to house fuel tanks which
can be either rigid or flexible. Opposite
flexible  rigid pipes pipes that do not
bend easily  a rigid structure a firm
unbendable structure
rigidity rigidity /r|d"dti/ noun inflexibility,
stiffness
Extra strength and rigidity
must be provided in the tail section for
aircraft with a tail wheel unit. Opposite
flexibility
rim rim /rm/ noun the outer edge of something
circular, e.g. a wheel
Creep
marks are painted on the tyre and the
wheel rim.
The rim of the air intake is
prone to icing.
rime ice rime ice /ram as/ noun ice formed
when individual droplets of water
freeze rapidly on striking the aircraft
surface
ring ring /rŋ/ noun a circle
Around the
　
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本文鏈接地址：Dictionary of Aviation下(59)