RAZAIR
‐
A1
‐
METRO
‐
III
‐
AFM
‐
001
1
‐
12
AC
POWER
AC
electrical
power
is
supplied
by
single
‐
phase
inverters.
Two
inverters
are
installed
but
only
one
is
used
at
a
time.
The
inverter
selector
switch
position
determines
which
one
is
used.
The
inverters
produce
115
volt
and
26
volt
AC
power.
Fig.
25
AC
power
voltmeter.
The
AC
warning
and
monitoring
system
includes
a
bus
selectable
voltmeter
on
the
left
console
(Fig
25)
and
two
bus
failure
warning
lights
on
the
annunciator
panel.
The
AC
voltmeter
can
be
selected
to
monitor
either
the
left
or
the
right
115
volt
bus.
If
power
to
either
115
volt
bus
is
lost,
the
respective
AC
BUS
warning
light
illuminates.
Illumination
of
both
warning
lights
is
usually
an
indication
of
inverter
failure
and
the
other
inverter
should
be
selected.
POWER
DISTRIBUTION
Aircraft
power
is
distributed
through
three
DC
and
four
AC
busses.
DC
power
is
distributed
through
the
Left
Essential
Bus
(LEB),
the
Right
Essential
Bus
(REB)
and
the
Non
‐
Essential
Bus
(NEB).
Both
the
LEB
and
RB
are
limited
to
225
amperes
while
the
NEB
is
limited
to
150
amperes.
The
LEB
is
located
in
the
left
console.
The
REB
and
NEB
are
located
in
the
right
console.
Each
bus
is
connected
to
the
distribution
system
with
the
bus
tie
switch
mounted
on
the
respective
console
(Figures
26
and
27).
The
LEB
power
ten
essential
items:
1.
Pilot’s
DC
instruments
2.
Fuel
crossflow
valve.
3.
Pilot’s
turn
and
bank.
4.
Surface
deicer
boots.
5.
Landing
gear
control.
6.
Landing
gear
position
indicator.
7.
Cabin
pressure
dump.
8.
Left
engine
intake
heat.
9.
Right
engine
intake
heat.
10.
Left
windshield
heat.
These
items
can
also
be
powered
by
the
RB
by
actuating
the
BUS
TRANSFER
switches
located
on
the
aft
end
of
both
left
and
right
side
panels
(Figures
26
and
27).
