M16 (C) TANDEM TRAINER
MAINTENANCE MANUAL
.
ISSUE
PAGE
A_November 2012
41
9.
The
outside
observer
will
now
have
to
verify
that
the
belts
pn
A28
remain
still
on
the
pulleys
pn
124
(3)
and
are
not
dragged
by
these
pulleys.
If
this
condition
is
satisfied,
go
to
the
next
step.
Otherwise
proceed
to
point
11;
10.
Increase
the
engine
r.p.m.
to
a
value
between
3500
and
4000.
The
outside
observer
will
have
to
verify
that
the
belts
remain
still
on
the
pulleys
and
are
not
dragged
by
them.
If
this
condition
is
satisfied,
go
to
point
12.
Otherwise
proceed
to
point
11;
11.
Wait
till
the
rotor
r.p.m.
is
less
than
50
and
repeat
points
4,
5,
6,
7,
8
and
9;
12.
It
is
possible
to
go
for
a
flight
test
if
the
pre
‐
rotation
parameters
are
similar
to
the
indications
of
the
following
diagram.
3.2.4
PRE
ROTATION
PARAMETERS
SUMMARY
TABLE
Engine
RPM
Rotor
RPM
1800
>160
2200
‐
2400
200
Reaching
the
parameters
indicated
in
the
above
table
guarantees
the
efficiency
of
the
pre
‐
rotation
system.
3.3
REPLACEMENT
OF
PULLEYS
AND
BELTS
(See
Fig.
3.3/1)
The
belts
pn
A28
and
the
pulleys
pn
124
are
subject
to
a
continuous
wear
in
all
the
operations,
except
during
pre
‐
rotation.
The
pulley
pn
124
and
propeller
are
fixed
with
six
bolts
pn
284
to
the
engine
flange;
thus
its
rotation
is
identical
to
the
number
of
revolutions
of
the
engine.
Furthermore,
the
belts
pn
A28
are
braked
whenever
they
are
not
tightened
through
the
pre
‐
rotation
system.
So,
interference
and
a
continuous
slipping
are
created
between
the
belts
and
pulleys,
which
modify
the
profile
of
the
pulleys’
grooves.
The
wear
of
the
pulleys
causes
a
reduction
of
the
performances
of
the
pre
‐
rotation
system,
which
can
be
overcome
by
following
the
procedures
described
in
section
3.2.
Because
the
adjustments
described
above
will
no
longer
be
sufficient
to
bring
the
system
back
to
full
efficiency,
replacement
of
belts
and
pulleys
is
recommended
every
500
hours
as
indicated
in
the
"Ordinary
Maintenance
Schedule".
WARNING:
Always
use
belts
and
pulleys
supplied
by
Magni
Gyro
itself,
as
these
parts
are
run
‐
in
by
the
Manufacturer
so
as
to
guarantee
a
soft
and
progressive
coupling,
even
during
the
first
pre
‐
rotations.
Take
care
to
note
the
position
of
the
belts
on
the
pulley
when
they
are
supplied
by
the
Manufacturer
or
Area
Retailer
and
do
not
invert
them
(as
each
pair
of
pulleys
is
run
‐
in
on
its
own
pulley,
each
belt
impresses
its
own
groove
on
that
pulley).
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