Piper CHEROKEE ARCHER II Pilot Operating Handbook page 156

SECTION 9
SIJPPLEMENTS
PIPER
AIRCRAFT CORPORATION
PA.2&18I,
CHEROKEE ARCITER tr
SECTION
4.
NOR,\IAL PROCEDURES
Prior to takeoff, the air conditioner should be checked for proper operation
as
follows:
(a)
Check
aircraft
master switch
"ON."
(b)
Turn the air conditioner control switch
to "ON"
and the fan switch
to
one
of
the
operating
positions
-
the
"AIR
COND DOOR OPEN" warning light
will tum
on, thereby indicating proper
air conditioner condenser door actuation.
(c)
Turn the air conditioner control switch
to "OFF" -
the
"AIR
COND DOOR OPEN" warning
lieht will
go
out, thereby indicating the air conditioner
condenser door is in the up position.
(d)
If
the
"AIR
COND DOOR OPEN"
light
does
not
respond
as
specified above,
an
air conditioner
system
or indicator bulb malfunction
is indicated and further investigation should
be
conducted
prior to night.
The above operational check may
be
performed during flight
if
an
in flight failure
is suspected.
The condenser door
light
is located
to
the rieht
of
the engine instrument cluster in
front of the pilot.
The door
light illuminates when the door
is open and is
off
when the door is
closed.
SECTION
5.
PERFORMANCE
Operation
of
the air conditioner
will
cause
slight
decreases
in
cruise speed and range.
Power
from
the
engine is
required to run the compressor, and the condenser door, when extended,
causes a
slight
increase
in
drag. When
the air conditioner is turned
off
there is normally no
measurable
difference in climb, cruise or
range
perforrnance
of
the airplane.
NOTE
To insure maximum climb perfornance the air conditioner must
be turned
off manually before takeoff to
disengage
the compressor
and retract the condenser door. Also the
air conditioner must
be
tumed
off
manually before the landing approach
in preparation
for
a
possible go-around.
Although the cruise speed and range are
only slightly
affected by the air conditioner operation,
these
changes strould be considered
in preflight planning. To be
conservative,
the following
figures
assume
that
the
compressor
is
operating continuorsly
while the
airplane
is airbome. This
will
be the
case
only
in
extremely
hot
weather.
(a)
The
decrease
in true
airspeed
is approximately 4 KTS at all power settings.
(b)
The decrease
in
range
may
be
as
much
as
32 nautical miles
for the 48 gallon capacity.
REFORT: YB-790
94
ISSLJED:
JUNE 18,1976