.A~rcraft Public:~tions
P~pcr Com;lnchc
250
(Early Model)
Section
-
6
Weight and Balance
AIRPLANE WEIGHING PROCEDURE
At the time of licensing, Piper Aircraft Corporation provided each airplane with the basic empty
weight and C.G. location. The removal andlor addition of equipment or aircraft modifications can
affect the basic empty weight and center
of
gravity. The following procedure
is
used to re-
determine the basic empty weight and C.G. location.
1.)
Preparation:
A,) Be certain that all items checked in the equipment list are installed in the proper location in
the airplane.
B.)
Remove excessive dirt, grease, moisture and foreign items such as rags and tools from the
airplane before weighing.
C.)
De-fuel the airplane, then add the unusable fuel (4.0 gallons total, 2.0 gallons to each
wing). Drain engine oil.
D.) Place pilot and copilot seats in a normal seating position (approximately the eighth notch
aft of full forward position). Put flaps in the
fUy retracted position and all control surfaces in
the neutral position. Secure the tow bar in its proper location and close all doors.
2.)
Leveling:
A.) With the airplane on scales, inflate main gear oleo pistons to the fdly extended position
B.)
Level the airplane both laterally and longitudinally by deflating the tires to center the
bubble on the level. The longitudinal level point is across the two machine screws above the
baggage compartment door. The lateral level point is located either at the station
136.5
bulkhead in the baggage compartment or the hat section channel of the firewall.
3.)
Weighing
-
Airplane Basic Empty Weight:
A,) Weigh the airplane inside a closed building to prevent errors in scale readings due to wind.
B.)
With the airplane level and the brakes released, record the weight shown on each scale.
Deduct the tare, if any, from each reading to determine the net weight. Basic empty weight is
the sum of all three readings.
4.)
Calculation
-
Basic
Empty
Weight Center of Gravity:
A.) The basic empty weight center of gravity can be determined by the following formula:
(See Figure
6-01)
Where
T=N+R+L
Copyright:
1993
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6-3
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