Arrow PA-28R-201 Pilot's Operating Handbook And Faa Approved Airplane Flight Manual page 139

SECTION 6
WEIGHT AND BALANCE
6.1 GENERAL (continued)
PIPER AIRCRAFT CORPORATION
PA-18R-201, ARROW
The basic empty weight and CG. location are recorded in the Weight (
and Balance Data Form (Figure 6-5) and the Weight and Balance Record
(Figure 6-7). 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 empty weight
and
CO. position and to write these in the Aircraft Logbook and the Weight
and Balance Record. 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 ensure against improper loading.
The following pages are forms used in weighing an airplane in
production and in computing basic empty weight,
CO. position, and useful
load. Note that the useful load includes usable fuel, baggage, cargo and
passengers. Following this is the method for computing takeoff weight and
CO.
6.3 AIRPLANE WEIGHING PROCEDURE
At the time of licensing, Piper Aircraft Corporation provides each
airplane with the basic empty weight and center of gravity location. This
data is supplied by Figure 6-5.
The removal or addition of equipment or airplane modifications can
affect the basic empty weight and center of gravity. The following is a
weighing procedure to determine this basic empty weight and center of
gravity location:
(a) Preparation
(I) Be certain that all items checked in the airplane equipment
list are installed in the proper location in the airplane.
(2) Remove excessive dirt, grease, moisture, foreign items such
as rags and tools from the airplane before weighing.
(3) Defuel airplane. Then open all fuel drains until all
remaining fuel is drained. Operate engine on each tank
until all undrainable fuel is used and engine stops. Then
add the unusable fuel (5.0 gallons total, 2.5 gallons each
wing).
REPORT; VB-1365
6-2
ISSUED: SEPTEMBER 15,1988
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