Piper Aircraft Corporation Cherokee Arrow II, Руководство по эксплуатации

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ARROW
WEIGHT AND BALANCE
In order to achieve the performance and flying characteristics which are designed into the
aircraft, the Arrow must be flown with the weight and center of gravity (C.G.) position within the
approved envelope. The aircraft offers a tremendous flexibility of loading. However, you cannot fill
the aircraft, with four adults, full fuel tanks and maximum baggage. With the flexibility comes
responsibility. The pilot must insure that the airplane is loaded within the loading envelope before
he makes a takeoff.
Misleading carries consequences for any aircraft. An overloaded airplane
will
not take off,
climb or cruise as well as when it is properly loaded. The heavier the airplane is loaded the less
climb performance it will have.
Center of gravity is a determining factor
in
flight characteristics. If the C.G. is too far
forward in any airplane, it may be difficult to rotate for take-off or landing. lf the C.G. is too
far aft, the airplane may rotate prematurely on take-off or try to pitch up during cUmb.
Longitudinal stability will be reduced. This can lead to inadvertent stalls and even spins; and
spin recovery becomes more difficult as the center of gravity moves aft of the approved limit.
A properly loaded aircraft, however, will perform as intended. Before the aircraft is delivered,
the Arrow is weighed and a basic weight and C.G. location computed. (Basic weight consists of the
empty weight of the aircraft plus the unusable fuel and full oil capacity.) Using the basic weight and
C.G. location, the pilot can easily determine the weight and C.G. position for the loaded airplane by
computing the total weight and moment and then determining whether they are within the approved
envelope.
The basic weight and C.G. location for a particular airplane are recorded in the weight and
balance section of the Airplane Flight Manual. The current values should always be used. Whenever
new equipment is added or any modification work is done, the mechanic responsible for the work is
required to compute a new basic weight and basic C.G. position and to write these in the aircraft log
book. The owner should make sure that it is done.
A weight and balance calculation is necessary in determining how much fuel or baggage can be
boarded so as to keep within allowable limits. Check calculations prior to adding fuel to insure
against improper loading.
The following pages are forms used in weighing an airplane in production and in computing
basic weight, basic C.G. position, and useful load. Note that the useful load includes fuel, oil,
baggage, cargo and passengers. Following this is the method for computing takeoff weight and C.G.
ISSUED:
October
14, 1971
REVISED: APRLL 10, 1979
REPORT: VB-334 PAGE 5-1
MODEL: PA-28R-200
N16422 POH