Piper ARCHER III - Page 102

SECTION 5
PERFORMANCE PA-28-181, ARCHER III
SECTION 5
PERFORMANCE PA-28-181, ARCHER III
REPORT: VB-1611 ISSUED: JULY 12, 1995
5-6
REPORT: VB-1611 ISSUED: JULY 12, 1995
5-6
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 6 min.) 10 min.*
(2) Distance to Descend
(33 naut. miles minus 13 naut. miles) 20 naut. miles*
(3) Fuel to Descend
(3.2 gal. minus 1.3 gal.) 1.9 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
5-20 [a,b] and 5-21).
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 nm minus 12 nm minus 20 nm) 282 naut. miles
*reference Figure 5-31
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 6 min.) 10 min.*
(2) Distance to Descend
(33 naut. miles minus 13 naut. miles) 20 naut. miles*
(3) Fuel to Descend
(3.2 gal. minus 1.3 gal.) 1.9 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
5-20 [a,b] and 5-21).
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 nm minus 12 nm minus 20 nm) 282 naut. miles
*reference Figure 5-31