Piper ARCHER III Pilot Operating Handbook page 142

SECTION 5
PERFORMANCE
5.5 FLIGHT PLANNING EXAMPLE (continued)
(d) Descent
The descent data will be determjned prior to the cruise data to
provide the descent distance for establishing the total cruise distance.
Utilizing the cruise pressure altitude and OAT, determine the
basic time, distance and fuel for descent (Figure 5-37). These figures
must be adjusted for the field pressure altitude and temperature at
the destination airport. To find the necessary adjustment values,
use the existing pressure altitude and temperature condjtions at the
destination airport as variables to find the Lime, distance and fuel
values from the graph (Figure 5-37).
Now, subtract the values obtained from the field conditions from
the values obtained from the cruise conditions to find the true Lime,
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.
(I) Time to Descend
(16 min. minus 6 min.)
(2) Distance to Descend
(33 naut. miles minus 13 naut. miles)
(3) Fuel to Descend
(3.2 gal. minus I .3 gal.)
*reference Figure 5-31
REPORT: VB-2749
5-6
PA-28-181, ARCHER ill
10 min.*
20 naut. miles*
1.9 gal.
ISSUED: December 22, 2017
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