Piper Cherokee Six - Page 513

PIPER
CHEROKEE
SIX SERVICE
MANUAL
9-38.
MAGNETIC
COMPASS.
9-39.
GENERAL.
The magnetic
compass
is a self-contained
instrument.
This
instrument
has an individual
light which is
connected to the instrument
lighting
circuit. The compass
correction
card is located
in the
card holder
mounted on
the instrument.
The compass
should beswungwhenever
instruments
or radios
are changed
and at
least once a
year.
9-39a.
ADJUSTMENT OF
COMPASS. Before
attempting to
compensate compass,
every
effort
should
be made to place
the aircraft
in simulated
flight conditions;
check
to see that
the doors
are closed,
flaps in
retracted position,
engine
running,
throttle set
at cruise
position and
aircraft in level
flight attitude. Aircraft
master switch,
alternator switch and
all
radio
switches should
be in the
ON position.
All other
cockpit controlled
electrical
switches
should
be in the
OFF position.
a. Set adjustment
screws of compensator on
zero. Zero position of adjusting screws
is when
the dot of the screw is lined
up with the dot of the frame.
b. Head
aircraft on
a magnetic
North heading.
Adjust
N-S adjustment
screw until
compass
reads exactly
North.
c. Head aircraft
on a magnetic
East heading
and do the same
as Step b, adjusting
E-W adjusting screw.
d. Head
aircraft
on a magnetic
South heading
and note
resulting
South error.
Adjust
N-S adjusting
screw until one-half of this
error has been removed.
e. Head
aircraft on magnetic
West and do
same as Step d, adjusting
E-W adjustment
screw.
f. Head
aircraft in
successive
magnetic 30
degree
headings and
record compass
readings on appropriate
deviation card.
Deviations must
not exceed + 10
on any heading.
INSTRUMENTS
Revised:
9/18/78
2K21