Raytheon Beech Baron E55 - Page 384

~eechcraft
BARON
55
AND
58
SHOP
MANUAL
NOTE
speed
should
be
625
to
650
rpm.
If
the
engine
is
not
idling
within
the
specified
range,
change
the
idle
After
each
idle mixture
adjustment,
clear
the
engine
by
increasing
rpm
to
approxi-
speed adjustment
screw
as
required
to
obtain the
mately
2000
before
making
the
next
mix-
proper
idle
speed.
Refer
to
Figure
6-6.
Turn
the
idle
I
ture
check,
speed adjustment
screw
clockwise
to
increase
rpm
and
counterclockwise
to
decrease
rpm.
IDLE
SPEED
AND
MIXTURE
c.
The
engine-driven
fuel
pump
pressure
should
ADJUSTMENT
(Effectivity:
TH-
1389,
read
8.00
to
10.00
psig.
If
adjustment
is
required
to
TH-
1396
and after
IO-550-C
Engine)
achieve
the
proper
pump pressure,
turn
the
relief
valve
adjustment
screw
clockwise to
increase
pres-
a.
Install
a
pressure gage
in the fuel line between the
sure
and
dounterclockwise to
decrease
pressure.
engine-driven
fuel
pump
and
the
metering
unit. The
Refer
to
Figure
6-7
gage
will be used
to
monitor fuel
pump
outlet
pressure
d.
Maintain
the
specified
idle
rpm
and the
fuel
pump
(also
called
unmetered
pressure).
pressure.
Adjust
the
mixture
to
attain
a
momentary
NOTE
gain
of 25
to
50
rpm
when
the mixture control is
moved toward the
idle cutoff
position.
If
the mixture
is
The
pressure gage
should be vented
to
too
lean,
the
rpm
will
drop.
If
an
idle
mixture
adjust-
the
atmosphere.
ment
is
required,
turn
the idle
mixture
adjusment
nut
b. Start and
run
the
engine according
th
the
warm-up
as
necessary
(tighten
the
nut to
enrich
the
mixture
or
procedures
in the
applicable
Pilot’s
Operating
Hand- loosen the
nutto
lean the
mixture)
to
obtain
the
cor-
book. Move the mixture
control
to
full
rich. The idle
rect
idle
mixture.
Refer
to
Figure
6-6.
METERED OR FUEL
FLOW FUEL
FLOW UNMETERED
OR
PUMP
ENGINE
RPM
NOZZLE PRESSURE
LBSIHR GAUHR
OUTLET
PRESSURE
(881)
PSI
I I
(APPROX.)
I
(REF.
ONL
625-650
1 I I i
9-11
IO-470-L
*2625
15.5- 16.5
123- 130 20.5-
21.7
25-27.5
IO-520-BB
625-650
1 I I 1
9-11
and
"2700
15.5-
16.5 136-
146
22.7-
24.3
28-31
IO-520-CB
625-650
1 I I 1
8.00-
10.00
10-550-0
*2700
17.9-
18.5
35-38
Values
given
are
for maximum
rated
RPM.
If
I
When
setting
up
full throttle
fuel flow
on an
above
standard
rated
rpm
at
static
run-up
cannot
be
day
(above
60
"F),
the
system
should
be
set
toward
the
achieved
with full
throttle,
adjust
flow
slightly
lower limit.
On
a
below standard
day (below
60"F),
the
sys-
below values
given.
Make certain
specified
tem
should
be
set
toward
the
higher
Row limit.
values
are
achieved
when
rated
rpm
is
obtained
during
takeoff roll.
8704878
Fuel
Pressure and
Flow
Chart
6-1
815
6-11