Mooney M20M - Magnetic Compass; Turn Coordinator; Turn Coordinator-Trouble Shooting

SERVICE
AND
MAINTENANCE MANUAL M20M MOONEY AIRCRAFT
CORPORATION
D/G
TROUBLE
SHOOTING
(con’t.)
TROUBLE PROBABLE
CAUSE
REMEDY
Defective mechanism
(worn
or
Replace
instrument.
dirty
pivots
and
bearings.)
Dial
spins
continuously
in
one
Operating
limits
have
been Reset the
instrument
with
the aircraft
in
direction. exceeded
level
Right.
Defective mechanism.
Replace
instrument.
34-21-00
-TURN
COORDINATOR
A
gym
instrument
that
indicates
control coordination and
rate
of
turn.
This
instrument is
electrically
driven.
34-21-01
TURN
COORDINATOR
TROUBLE
SHOOTING
TROUBLE PROBABLE
CAUSE
REMEDY
Pointer
fails
to
respond.
Foreign
matter
lodged
in
Replace
instrument.
instrument.
No
electric
current.
Check
voltage
at
instrument.
Bar does
not
set
level.
Gimbal and
rotor
assembly Replace
instrument.
out
of
balance.
Fitted
or worn
pivots
or
Replace
instrument.
bearings.
In
low
temperature,
bar
fails
to
Oil has
become
too
thick.
Replace
instrument.
respond
or
responds
sluggishly
and with insufficient
deflection.
Insufficient
bearing
clearance.
Replace
instrument.
Bar
sluggish
in
returning
to
Oil
or
dirt
between
damping
Replace
instrument.
level does
not
set
on
level
pistons
and
cylinders.
when
stationary.
Excessive
clearance
Replace
instrument.
between
rotor
and
rotor
pivots.
34-22-00
MAGNETIC COMPASS
NOTE
The
magnetic
compass
dial,
graduated
in
five-degree
Check
for
outside
magnetic
influences if
increments,
is
encased
in
a
liquid
filled
glass
and
metal
excessive
compensation
is
required.
case.
The unit
mounts
at
the
top
of the
glareshield.
The
compass
should
be
swung
and
compensated
at
each
annual
inspection
and
whenever
new
equipment
is
installed.
To
compensate
for
N-S
deviation,
adjust
left
screw;
to
compensate
for E-W
deviation,
adjust
right
screw.
Degausing
of the tubular
structure
may
be
required
if
compass
cannot
be
compensated
within
limits.
Carefully
go
over
the entire steel
structure
with
degauser,
from
center
to
outboard of
structure
(Left
Right),
to
remove
residual
magnetism.
It is
recommended that
an
Armature Growler be used
to
degause
steel
structure.
NOTE
Refer
to
S.B.
M20-150A,
Instruction
Ill,
for
detailed
degausing procedures.
34-21-00
4-99
OLDWILLWAYNE