Beechcraft C23 SUNDOWNER 180 Pilot Operating Handbook page 229

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SYSTEMS
DESCRIFTION
EMERGENCY
STATIC
AIR SOURCE
THE EMERGENCY
STATIC
AIR SOURCE SHOULD BE
USED FOR
CONDITIONS
WHERE THE NORMAL
STATIC
SOURCE HAS BEEN OBSTRUCTED. When
the airplane
has been
exposed to moisture and/or
icing
conditions
(ground
obstructions
not
properly
corrected may
cause
inflight
obstruction), the
possibility
of obstructed static
ports
should
be
considered.
Partial
obstruction
will
result
in
the
rate-of-climb
indication being
sluggish
during
a climb or
descent. Verification
of suspected obstruction
is
possible
by
switching to the emergency system and noting a sudden
sustained change
in
rate of climb.
This
may
be
accompanied
by
abnormal
indicated
airspeed and altitude changes
beyond
normal calibration
differences.
HANDLING,
SERVICING,
AND MAINTENANCE
EMERGENCY
STATIC
AIR
SOURCE
The
system should
be drained
every
100
hours.
Remove
cover
plate from
the
lower
middle
fuselage under
the spar
and
unscrew
knurled
nut to
disconnect
static air
lines
and
drain moisture. Reconnect
static air
lines.
Approved:
Chester
A. Rembleske
Beech
Aircraft
Corporation
DOA CE-2
FAA Approved
Date: June 2,
1978
P/N MCO
C32644-11
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