M16 (C) TANDEM TRAINER
MAINTENANCE MANUAL
PAGE
ISSUE
94
A_November 2012
5.2.2
OPERATION
ANOMALY
(See
fig.
5.1/1)
The
display
stays
black
and
gives
no
indication.
Actions
Make
sure
the
MASTER
switch
(20A)
is
in
ON
position
and
the
breaker
2A
FD
is
switched
ON.
Check
the
correct
tightening
of
the
connectors
on
the
back
of
the
instrument.
Verify
the
continuity
of
the
power
supply
wires
of
the
rotor
tachometer
instrument.
5.3
ROTOR
VIBRATIONS
(See
Fig.
5.3/1)
It
is
important
to
keep
the
rotor
vibrations
on
the
controls
and
machine
within
acceptable
limits.
This
contributes
to
the
maintenance
of
the
gyroplane.
The
frequencies
should
remain
similar
to
those
found
during
flight
testing
and
adjustments
conducted
by
the
producer.
Each
gyroplane
can
show
different
types
of
vibrations,
characterized
by
different
amplitude
and
frequency,
according
to
load,
speed
and
rotor
assembly.
The
pilot
must
evaluate
the
vibrations
on
the
controls.
Hereby
he
may
find
that
the
vibrations
are
getting
worse
with
time.
But,
prior
to
any
adjustment,
the
vibrations
must
be
checked,
during
a
periodical
or
special
inspection,
by
a
pilot
approved
by
the
producer.
The
first
step
towards
the
solution
of
the
problem
is
to
identify
the
type
of
vibration
so
as
to
define
the
type
of
intervention
needed
and
eliminate
the
problem
more
easily.
Lateral
vibrations
The
control
stick
shakes
laterally
(left
and
right).
Longitudinal
vibrations
The
control
stick
shakes
longitudinally
(pitch
up
and
down)
Divergent
vibrations
5.3.1
LATERAL
VIBRATIONS
Lateral
vibrations
with
constant
frequency
and
amplitude
can
be
smoothened
by
acting
on
the
threaded
bushing
pn
247
(loose
the
lock
nut
pn
283
first
to
move
the
threaded
bushing
pn
247).
In
fact,
screwing
the
threaded
bushing
in
or
out
makes
it
possible
to
offset
the
hub
‐
bar
pn
245
versus
the
head
pn
066
of
the
rotor
head.
But,
if
the
threaded
bush
has
not
been
tampered
or
if
the
lock
nut
is
not
loose,
it
is
better
to
avoid
this
intervention.
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