Piper SENECA III - Page 126

SECTION 5
PIPER AIRCRAFT CORPORATION
PERFORMANCE
PA-34-220T,
SENECA III
(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
Power
Setting
Tables
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
Speed Power
graph (Figure 5-27).
Calculate the
cruise
fuel for
the
cruise
power
setting
from
the
information provided
on
Figure
5-25.
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:
(l)
Total Distance
394
miles
(2)
Cruise Distance
(e)(!)
minus
(c)(4)
minus
(d)(2),
(394
naut,
miles minus
24
naut.
miles
minus
37
naut.
miles)
333
naut.
miles
(3)
Cruise
Power
55%
rated
power
(4)
Cruise Speed
172
KTS
TAS*
(5)
Cruise
Fuel
Consumption
18.7 GPH**
(6)
Cruise
Time
(e)(2)
divided
by
(e)(4), (333
naut.
miles divided by 172
KTS) 1.94 hrs.
(7)
Cruise Fuel
(e)(5)
multiplied
by
(e)(6), (18.7
GPH
multiplied
by
I
94
hrs.) 36.3 gal.
*reference
Figure 5-27
**reference
Figure 5-25
REPORT: VB-1110
ISSUED:
JANUARY
8, 1981
5-6