Cessna 172P - Page 242

5
DIGITAL
CLOCK
MODEL
172P
PILOT's
OPEF,ATING
HANDBOOK
SUPPLEMENl
at midnight
each
into
the oalendar
be
corrected
the
Pressing
the
LH
button
two
additional
times
will
cause
the time
to
appear
with
the hours
advance
the
hour
digits
standard.
Another
push
to
flash.
Advance the
mi
by
pressingthe
LH
button
once
reaches
the
value.,held"
by the
rmal
clock
timing,
which
will
In
some
instances,
however, it
may not be
necessary
to
advance
the
minutes
digits
of
the
clock; for example
when changing
time
zones.
In
such
a case,
do
not advance the
minutes digits
whÍle they
are
ftashing.
Instead,
press
the
LH button again, and
the
clock returns
to the
normal
time
keeping
mode without
altering
the
minutes
timing.
TIMER
OPERATION
The
completely
independent Z4-hour
elapsed
timer
(see
figure B)
is
operated
as follows:
press
the
center
(MODE)
push
button
until
the
timer
mode indicator
appears.
Reset the
display to "zero"
by
pressing
the LH
button, Begin timing
an event
by
pressing
the
F,H button.
The
timer
will
begin counting
in minutes
and seconds and the
colon
(activity
indicator)
will blink
off for 1/10 second each
second.
When 59 minutes
bg seconds
have
accumulated, the
timer changes to count in
hours
andminutes
up to a
rnaximum
of
23
hours, 59 minutes. During the
count
in hours
and
minutes,
the
colon
blinks off for one
second
each
ten seconds.
To stop
timing the
event,
press
the
RFI button once again and the time
shown
by the
display
is
"frozen".
Successive
pushes
of
the
RH button
will alternately
restart
the
connt from the
"held"
total
or stop the count
at a
new
total.
The
hold status
of the timercan
be recognized by lack
of colon
activity,
eithercontinuously
on or continuously
off . The timer
can bo reset to "zeto"
at anytime
using
the
LH button.
sEcTroN
5
PERFORMANCE
There
is no
change
to the
airplane
performance
when the
digital clock
is installed.
4
30 May 1980