Piper CHEROKEE ARCHER II Pilot Operating Handbook page 128

SECTION
7
DESC
RITTION
AT-ID
OPERATION
PIPER
AIRCRAFT CORPORATION
PA-2&I81, CHEROKEE ARCHER II
7.21
PITOT.STATIC SYSTEM
The system
supplies
both pitot
and static pressure
for
the
airspeed
indicator, altimeter, and
the
optional vertical
speed
indicator (Figure
7-17).
Pitot
and static pressure are picked up
by
a
pitot
head installed
on the bottom
of
the
left
wing
and
carried through
pitot
and static lines
within
the wing and
fuselage
to
the gauges on the instnrment panel.
An
alternate static source is available
as
optional equipment. The control
valve is located below
the
left
side
of the instrument panel.
When
the valve is set
in
the
alternate position, the altimeter, vertical
speed
indicator and
airspeed
indicator
will
be using cabin air
for
static pressure. The storm window and cabin
vents must be closed and the cabin heater and defroster must be on during alternate static source operation.
The altimeter error is
less
than 50 feet
unless
otherwise placarded.
Both
the
pitot
and static lines can be drained through separate drain
valves located on the left lower
side
of
the
fuselage
interior.
A
heated
pitot
head,
which
alleviates
problems
with icing
and heavy rain, is available
as optional
equipment. The switch
for
the heated
pitot
head
is located on the electrical switch panel to the
left of
the
right control
wheel.
To prevent bugs and water
from entering the
pitot
and
static pressure
holes,
a
cover strould be placed
over the
pitot
head.
A partially or
completely blocked
pitot
head
will
give erratic or zero
readings on the
instruments.
NOTE
During the preflight,
check
to
make sure
the
pitot
cover
is
removed.
R-EIORT: VB-790
7-18
ISSLJED:
JLrNE
18,IYI6
REVISED: JULY 12,ly77