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MODIFIED FUEL
MANAGEMENT
PROCEDURES
With
a
combination
of highly
volatile
fuel,
high
fuel
temperature,
high
operating
altitude,
and low
fuel flow
rate
in
the tank
outlet
lines,
there
is
a remote
possibility
of
accumulating
fuel
vapor and
encountering
power
ir-
regularities
on
some
airplanes.
To minimize
this
possibility,
the
follow-
ing
operating
procedures
are
recommended:
(1)
Take-off
and climb
to
cruise
altitude on "both"
tanks.
(This
is consistent
with current
recomtnendations.)
(2)
When reaching
cruise
altitude above 5000 feet
MSL,
promptly
switch
the
fuel selector
valve
from "both"
tanks to
either
the
"right"
or
"left"
tank.
(3)
During
cruise,
use
"left" and
"right"
tank
as
required.
(4) Select "both"
tanks
for landing as currently
recommended.
POWER RECOVERY TECHNIQUES
In
the
remote event
that
vapor is present
in sufficient
amounts
to
cause a
power
irregularity,
the
following
power
recovery
techniques
should
be followed:
OPERATION
ON A SINGLE TANK
Should
power
irregularities
occur
when operating
on a single
tank,
power
can be restored
immediately
by switching
to the
opposite
tank.
In addition,
the
vapor
accumulation
in
the tank
on which
the
power
irregu-
larity
occurred
will rapidly
dissipate
itself
such
that that tank
will
also be
available
for
normal
operation
after it
has
been
unused
for approximately
one (1)
minute.
OPERATION
ON BOTH TANKS
Should power
irregularities
occur with
the
fuel selector
on both
tanks,
the
following steps are
to
be
taken to
restore
power:
(1) Switch
to
a single
tank
for a
period
of
60 seconds.
(2)
Then
switch
to the
opposite
tank
and power
will
be
restored.
1-5
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