SECTION 7
DESCRIPTION &
PIPER
OPERATION
ATRCRAFT
CORPORATION
PA-24-181, ARCHER
It
7,2I PITOT-STATIC
SYSTEM
The syst€m
supplies both
pitor
and static
prcssure
for
the airspecd
indicator,
altimeter, and thc optional
vertical
speed
indicator (Figure
?-17).
Pitot and static
pressure
are
picked
up by a
pirot
head installed
on the
bottom of the left
wing and carried through
pirot
and lratic lines
within the
wing and fuselag€ to th€
gauges
on the instrumenr panel.
An alternate
siatic sourc€ is
available as oprional
equipment. The
controlvalve
is located b€low thc left
side of the insrrument
panel.
When the
valve
is let in
rhe alternate
position.lh€
alrimeler, rerricalsp€ed
indicaror
and aißpecd indicator
sill
be using cabin
air for sraric
pre\sure.
The
srorm
window and csbin vents must
be closed and
the cabin heat€r and defroster
must be on during alternate static
source operation.
The ahimet€r
error is
less
than 50 feet unless otherwise
placarded.
Both the
pitot
and s6tic lines can
be drained lhrough
separate drain
valves located
on the left lower side
of rhe fuselag€ interior.
A heat€d
pitot
head,
which alleviates
problems
wirh icing and h€avy
rain, is availableas optional equipment.
Theswitch
forthe heated
pitorh€ad
is located
on the electri€al swirch
pan€l
to the l€ft
ofthe righi control wheel.
To
prevent
bugs and
water from
ent€ring
the
pitot
and sraric
pressur€
holcs,
a cover should be
placed
over
the
pitol
head. A
parriauy
or completely
blocked
pitot
head
will
give
erratic or zero
readings on the insrrumenrs.
NOTE
During the
preflighr.
ch€ck ro make sure the
pitot
cover is removed,
REPORT: vB.U20
ISSUED: JULY 2, 1979
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