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35.1Visual separation is a means employed by ATC
to separate aircraft in terminal areas and en route
airspace. There are two methods employed to effect
this separation:
35.1.1The tower controller sees the aircraft
involved and issues instructions, as necessary, to
ensure that the aircraft avoid each other.
35.1.2A pilot sees the other aircraft involved and
upon instructions from the controller provides
separation by maneuvering the aircraft to avoid it.
When pilots accept responsibility to maintain visual
separation, they must maintain constant visual
surveillance and not pass the other aircraft until it is
no longer a factor.
NOTE−
Traffic is no longer a factor when during approach phase
the other aircraft is in the landing phase of flight or
executes a missed approach; and during departure or en
route, when the other aircraft turns away or is on a
diverging course.
35.2A pilot’s acceptance of instructions to follow
another aircraft or provide visual separation from it is
an acknowledgment that the pilot will maneuver the
aircraft as necessary to avoid the other aircraft or to
maintain in−trail separation. In operations conducted
behind heavy jet aircraft, it is also an acknowledgment
that the pilot accepts the responsibility for wake
turbulence separation.
NOTE−
When a pilot has been told to follow another aircraft or to
provide visual separation from it, the pilot should promptly
notify the controller if visual contact with the other aircraft
is lost or cannot be maintained or if the pilot cannot accept
the responsibility for the separation for any reason.
35.3Scanning the sky for other aircraft is a key
factor in collision avoidance. Pilots and copilots (or
the right seat passenger) should continuously scan to
cover all areas of the sky visible from the cockpit.
Pilots must develop an effective scanning technique
which maximizes one’s visual capabilities. Spotting
a potential collision threat increases directly as more
time is spent looking outside the aircraft. One must
use timesharing techniques to effectively scan the
surrounding airspace while monitoring instruments
as well.
35.4Since the eye can focus only on a narrow
viewing area, effective scanning is accomplished
with a series of short, regularly spaced eye
movements that bring successive areas of the sky into
the central visual field. Each movement should not
exceed ten degrees, and each area should be observed
for at least one second to enable collision detection.
Although many pilots seem to prefer the method of
horizontal back−and−forth scanning every pilot
should develop a scanning pattern that is not only
comfortable but assures optimum effectiveness.
Pilots should remember, however, that they have a
regulatory responsibility (14 CFR Section 91.113) to
see and avoid other aircraft when weather conditions
permit.
36. Use of Visual Clearing Procedures
36.1Before Takeoff.Prior to taxiing onto a runway
or landing area in preparation for takeoff, pilots
should scan the approach areas for possible landing
traffic, executing appropriate clearing maneuvers to
provide them a clear view of the approach areas.
36.2Climbs and Descents.During climbs and
descents in flight conditions which permit visual
detection of other traffic, pilots should execute gentle
banks, left and right at a frequency which permits
continuous visual scanning of the airspace about
them.
ENR 1.1−32 AIP
15 MAR 07 United States of America
Nineteenth Edition Federal Aviation Administration
36.3Straight and Level.Sustained periods of
straight and level flight in conditions which permit
visual detection of other traffic should be broken at
intervals with appropriate clearing procedures to
provide effective visual scanning.
36.4Traffic Patterns.Entries into traffic patterns
while descending create specific collision hazards
and should be avoided.
36.5Traffic at VOR Sites.All operators should
emphasize the need for sustained vigilance in the
vicinity of VORs and airway intersections due to the
convergence of traffic.
36.6Training Operations.Operators of pilot
training programs are urged to adopt the following
practices:
36.6.1Pilots undergoing flight instruction at all
levels should be requested to verbalize clearing
procedures (call out, Clear" left, right, above, or
below) to instill and sustain the habit of vigilance
during maneuvering.
36.6.2High−wing Airplane.Momentarily raise
　
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