Piper ARCHER II - Page 94

SECTION
5
PIPER
AIRCRAFT
CORPORATION
PERFORMANCE
PA-28-18],
ARCHER
II
values
from
the
graph
(Figure
5-31).
Now,
subtract
the
values
obtained
from
the
field
conditions
from
the
values
obtained
from
the
cruise
conditions
to
find
the
true
time,
distance
and
fuel
values
needed
for
the
flight
plan.
The
values
obtained
by
proper
utilization
of
the
graphs
for the
descent
segment
of
the
example
are
shown
below.
(1)
Time
to
Descend
(16
min.
minus
7.5
min.)
8.5
min.*
(2)
Distance
to
Descend
(35
minus
14.5
naut.
miles)
20.5
naut.
miles*
(3)
Fuel
to
Descend
(2
gal.
minus
1
gal.)
1
-gal.*
(e) Cruise
Using
the
total
distance
to
be
traveled
during
the
flight,
subtract
the
previously
calculated
distance
to
climb
and
distance
to
descend
to
establish
the
total
cruise
distance.
Refer
to
the
appropriate
Avco
Lycoming
Operator’s
Manual
when
selecting
the
cruise
power
setting.
The
established
pressure
altitude
and
temperature
values
and
the
selected
cruise
power
should
now
be
utilized
to
determine
the
true
airspeed
from
the
appropriate
Speed
Power
graph
(Figure
5-21
or
5-23).
Calculate
the
cruise
fuel
flow
for
the
cruise
power
setting
from
the
information
provided
by
the
Avco
Lycoming
Operator’s
Manual.
The
cruise
time
is
found
by
dividing
the
cruise
distance
by
the
cruise
speed
and
the
cruise
fuel
is
found
by
multiplying
the
cruise
fuel
flow
by
the
cruise
time.
The
cruise
calculations
established
for
the
cruise
segment
of
the
flight
planning
example
are
as
follows:
(1)
Total
Distance
314
naut.
miles
(2)
Cruise
Distance
{e)(1)
minus
(c)(4)
minus
(d)(2),
(314
minus
11.5
minus
20.5)
282
naut.
miles
*reference Figure 5-3]
REPORT:
VB-1120
ISSUED:
JULY
2,
1979
5-6
REVISED:
NOVEMBER
15,
1982