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WSC airfoil.
Reflex lines. Wires attached to the top of the king post and
the trailing edge of the airfoil to maintain the reflex of the
airfoil, used on some wings for trim by raising and lowering
the trailing edge of the wing.
Region of reverse command. Flight regime in which flight
at a higher airspeed requires a lower power setting and a
lower airspeed requires a higher power setting in order to
maintain altitude.
Registration certificate. A federal certificate that documents
aircraft ownership.
Relative humidity. The ratio of the existing amount of
water vapor in the air at a given temperature to the maximum
amount that could exist at that temperature; usually expressed
in percent.
Relative wind. The direction the wind strikes an airfoil. If a
wing moves forward horizontally, the relative wind moves
backward horizontally. Relative wind is parallel to and
opposite the flightpath of the airplane.
Restricted area. Airspace designated under 14 CFR part
73 within which the flight of aircraft, while not wholly
prohibited, is subject to restriction.
Ribs. The parts of an aircraft wing structure that give the
wing its aerodynamic cross section. WSC has battens that
are inserted in to the sail that act as ribs.
Risk. The future impact of a hazard that is not eliminated
or controlled.
Risk elements. The four fundamental areas of exposure to
risk: the pilot, the aircraft, the environment, and the type of
operation that comprise any given aviation situation.
Risk management. The part of the decision making process
which relies on situational awareness, problem recognition,
and good judgment to reduce risks associated with each
flight.
Roll. The rotation of an aircraft about its longitudinal axis. It
is controlled by moving the control bar side to side.
Roundout (flare). The slow, smooth transition from a normal
approach attitude to a landing attitude. This maneuver is
accomplished in a WSC by easing forward on the control
bar from approach speed as the WSC gets near the ground
for landing to reduce the descent rate to zero as the back
whels are inches above the ground, continuing to move the
control bar forward reducing speed as the back wheels are
inches above the landing surface, and continuing to push the
control bar full forward until the back wheels settle to the
surface for touchdown.
RPM. Revolutions per minute for the engine crankshaft. A
measure of rotational speed. One rpm is one revolution made
in one minute.
Runway. A defined rectangular area on a land airport
prepared for the landing and takeoff run of aircraft along its
length. Runways are normally numbered in relation to their
magnetic direction rounded off to the nearest 10 degrees (e.g.,
Runway 1, Runway 25).
Runway incursion. Any occurrence at an airport involving
an aircraft, vehicle, person, or object on the ground that
creates a collision hazard or results in loss of separation
with an aircraft taking off, intending to takeoff, landing, or
intending to land.
Runway threshold markings. Runway threshold markings
come in two configurations. They either consist of eight
longitudinal stripes of uniform dimensions disposed
G-15
symmetrically about the runway centerline, or the number of
stripes is related to the runway width. A threshold marking
helps identify the beginning of the runway that is available
for landing. In some instances, the landing threshold may
be displaced.
Safety directive. A manufacturer issued change to a S-LSA
that must be complied with. This is similar to an airworthiness
directive which is a regulatory notice sent out by the FAA to
the registered owner of an aircraft informing the owner of a
condition that prevents the aircraft from continuing to meet
its conditions for airworthiness. Airworthiness Directives
(AD notes) must be complied with within the required time
limit, and the fact of compliance, the date of compliance, and
the method of compliance must be recorded in the aircraft’s
maintenance records.
SAR. See search and rescue.
Scan. A procedure used by the pilot to visually identify all
resources of information in flight.
Scanning. Systematic means of searching for other aircraft.
Scanning is most effective when successive areas of the
sky are brought into focus using a series of short, regularly
spaced eye movements.
Scenario-based training. The instructor provides pilot,
aircraft, environment, and operational risk elements to train
the student to utilize ADM in making the best decision for
the given set of circumstances.
　
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