CESSNA
MODEL
172R
SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
6
-
FAA APPROVED
ADF
OPERATION NOTES:
r
ERRONEOUS
ADF
BEARING
DUE TO RADIO
FREQUENCY
PHENOMENA:
In the U.S., the FCC, which
assigns
AM
radio
frequencies,
occasionally will
assign
the
same
frequency
to
more than one
station
in
an
area. Certain conditions, such
as
Night Effect, may
cause
signals
from
such
stations
to
overlap.
This should
be
taken
into consideration when using AM broadcast station
for navigation.
Sunspots and atmospheric phenomena may occasionally distort
reception
so that signals
from
two
stations
on the same frequency
will
overlap.
For this
reason, it
is
always
wise to make
positive
identification
of
the
station being
tuned, by
switching the function
selector
to
ANT and listening
for
station
call letters.
ELECTRICAL STORMS:
In
the vicinity
of
electrical
storms,
an ADF
indicator
pointer tends
(
to swing
from the station tuned toward the
center
of
the
storm.
NIGHT EFFECT:
This is
a
disturbance
particularly
strong
just
after sunset
and
just
after
dawn.
An
ADF
indicator
pointer may
swing erratically
at
these
times. If-
possible,
tune to
the
most
powerful station
at
the lowest
frequency. If this is not possible, take the
average of
pointer
oscillations
to
determine relative
station
bearing.
MOUNTAIN EFFECT:
Radio waves reflecting
from
the surface
of
mountains
may
cause
the
pointer
to
fluctuate
or
show
an erroneous
bearing.
This should
be
taken
into
account
when taking bearings
over
mountainous!
terrain.
f**
COASTAL REFRACTION:
Radio
waves may be
refracted
when
passing from
land
to
sea or
when
moving
parallel
to
the
coastline.
This
also
should
be
taken
into
account.
Feb
28/00
S6-11
All manuals and user guides at all-guides.com
all-guides.com
Содержание Cessna 172R
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