Emergency Static Air System; Vacuum System; Stall Warning System; January, 1982 - Beechcraft C23 SUNDOWNER 180 Pilot Operating Handbook

Section VII
BEECHCRAFT Sundowner
180
Systems Description
C23(M-1285and
After)
EMERGENCY STATIC AIR SYSTEM
An emergency static air source
may be
installed to
provide
air for
instrument operation
should the static
ports become
blocked. Refer
to the
Pilot's
Operating Handbook and FAA
Approved Airplane Flight Manual
Supplement for
pro-
cedures describing
how and when
to
use
this system.
VACUUM SYSTEM
Vacuum for
air-driven
gyroscopic
flight
instruments
and
other air-driven
equipment is supplied
by
an engine-driven
vacuum
pump.
An
adjustable relief valve
controls suction
by bleeding outside
air into
the
vacuum pump.
A suction
gage indicates
system
vacuum in inches
of
mer-
cury.
This
instrument
is
located
on
the
pilot's
side of the
instrument panel. The vacuum
should
be
maintained
within
the
green
arc
for
proper
operation of the air-driven
instruments.
STALL WARNING
SYSTEM
A stall
warning
horn located in
the overhead speaker con-
sole sounds
a warning 5
to
7 mph above a
stall condition
and
continues steadily
as
the airplane
approaches
a
com-
plete
stall.
The
stall
warning
horn,
triggered
by a
sensing
vane
on
the
leading
edge of the
left wing, is
equally affec-
tive
in
all flight configurations
and
at all weights.
NOTE
With
the
battery
switch
in
the OFF
position
the
stall
warning horn is inoperative.
Airplane
certification requires the stall
warning
system
to
be on
during flight except in emergency
conditions as stated in Section III.
7-32
January,
1982