Mooney M20K - Turn Coordinator; Magnetic Compass

SERVICE
AND
MAINTENANCE
MANUAL
M20K
MOONEY
AIRCRAFT
CORPORATION
DIRECTIONAL
GYRO
TROUBLE
SHOOTING
(con’t~
TROUBLE
PROBABLE CAUSE
REMEDY
2.
Pump
failure.
2.
Repair
or
replace
pump.
3.
Vacuum
line
kinked,
leaking,
3. Locate
and
if
defective
replace
or
or
too
long
for its diameter.
repair
vacuum
line.
Check for
collasped
innerwall
ofRexible hose.
Defective mechanism
(wom
or
Replace
instrument.
dirty pivots
and
bearings.)
Dial
spins
continuously
in
one
Operating
limits
have
been Reset
the
instrument
with
the
direction.
exceeded
aircraft
in
level
flight.
Defective mechanism.
Replace
instrument.
34-21-00
-TURN
COORDINATOR
A
gym
instrument
that
indicates
control
coordination
and
rate
of
tum.
This
instrument
is
electrically
driven.
34-2191
TURN
COORDINATOR TROUBLE
SHOOTING
TROUBLE
PROBABLE CAUSE
REMEDY
Pointer
fails
to
respond.
Foreign
matter
lodged
in
Replace
instrument.
instrument.
No
electn’c
current.
Check
voltage
at
instrument.
Bar
does not
set
level.
Gimbal and
rotor
assembly
out
Replace
instrument.
of
balance.
Fitted
orwom
pivots
or
Replace
instrument.
bean‘ngs.
In
low
temperature,
bar
fails
to
Oil has
become
too
thick.
Replace
instrument.
respond
or
responds
sluggishly
and with
insufficient
deflection.
Insufficient
bean~ng
clearance.
Replace
instrument.
Bar
sluggish
in
returning
to
level
Oil
or
dirt behnreen
damping
Replace
instrument.
and
does
not
set
level
when
pistons
and
cylinders.
stationary
Excessive
clearance
between
Replace
instrument.
rotor
and
rotor
pivots.
34-22-00
MAGNETIC
COMPASS
Degausing
of
the
tubular
structure
may
be
required
if
compass
cannot
be
compensated
within limits.
The
magnetic
compass
dial,
graduated
in
five-degree
Carefully
go
over
the entire
steel
structure
with
increments,
is encased in
a
liquid
filled
glass
and
degauser
to
remove
residual
magnetism.
Recommend
metal
case.
The
unit
mounts
on
the stainless
steel
Armature
Growler
to
degause
steel
structure.
windshield
center
post
above the
glareshiekd.
The
compass
should be
swung
and
compensated
at
each
NOTE
annual
inspection
and
whenever
new
equipment
is
Refer
to
S.B.
M20-1S0A,
Instruction
Ill,
for
installed.
To
compensate
for
N-S
deviation,
adjust
left
degausing
procedures.
screw;
to
compensate
for
E-W
deviation,
adjust
n’ght
screw.
NOTE
Check for outside
magnetic
influences if excessive
compensation
is
required.
34-21-00
OLDWILLWAYNE