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NOTE
Any scale reading that shows a drift value of >5.0 pounds (2.3 kilograms) will
constitute the basis for a reweigh. Drift is the difference in scale reading between the
zero value adjusted prior to each weighing and the value indicated after the weighing
procedure.
4. Calculate the longitudinal center-of-gravity and percent MAC. Refer to the Airplane
Weighing Forms for formulas required.
NOTE
The center-of-gravity is sensitive to proper leveling.
Method 2: Leveling and Weighing on Landing Gear
1. Leveling on Landing Gear.
a. Inflate the nose gear strut to its maximum extension. Deflate the main gear struts to
the point where the airplane is approximately level.
b. Position jacks and jack the airplane, maintaining it approximately level. Refer to the
Maintenance Manual, Chapter 7, Lifting - Maintenance Practices.
c. Position scales under the wheels, carefully lower and center wheels onto the scales,
add wheel chocks and remove airplane from jacks.
d. To level laterally, place a leveling bar across the aft inboard crew seat rails at
approximately FS 196 inches (4978 millimeters).
(1) Ensure leveling bar is parallel to fuselage station plane and is resting solidly on
seat rails.
(2) Position the leveling tool on leveling bar with the base parallel to the long axis of
the leveling bar.
(3) Refer to the Maintenance Manual, Chapter 8, Leveling - Maintenance Practices.
Adjust the main gear tire or strut pressure to level the aircraft.
e. To level longitudinally, place a leveling bar across the aft inboard crew seat rails at
approximately FS 196 inches (4978 millimeters).
(1) Ensure leveling tool is perpendicular to fuselage station plane and is resting
solidly on seat rails.
(2) Position the leveling tool on leveling bar with the base perpendicular to the long
axis of the leveling bar at BL 0.0.
(3) Adjust the nose wheel tire or strut pressure to level if sufficient adjustment
capability remains. If adjustment is insufficient, adjust both main gear tires and/
or struts to level the airplane.
(Continued Next Page)
6-42 510WB-00
MODEL 510 SECTION VI - WEIGHT AND BALANCE DATA
CONTROL - GROUND OPERATIONS
FAA APPROVED
U.S.
Airplane Weighing Procedure (Continued)
Method 2: Leveling and Weighing on Landing Gear (Continued)
2. Weighing on Landing Gear.
a. After preparing and leveling the aircraft, allow scales to stabilize.
b. Record each scale reading.
(1) Record tare weight at each weighing point, where tare is used, to determine the
"as weighed" condition.
NOTE
Tare is any weight on the scales not to be included in the airplane weight, such as
wheel chocks.
(2) Record each scale reading and check for drift.
NOTE
Any scale reading that shows a drift value of >5.0 pounds (2.3 kilograms) will
constitute the basis for a reweigh. Drift is the difference in scale reading between the
zero value adjusted prior to each weighing and the value indicated after the weighing
procedure.
3. Measuring Oleo Extensions.
a. Accurately measure the oleo extension lengths. Use of digital calipers is preferred.
Measure the distance between the underside of the upper barrel and the topside of the
lower cap (Main Landing Gear) or the topside of the fork (Nose Landing Gear).
Measure the shiny portion of the oleo. See Figures 24 - 27.
b. Determine the axle/tire center-of-gravity for both the nose and main landing gear using
the equations in Figures 24 - 27.
c. Determine the values A and B on the Airplane Weighing Form using the calculated
axle/tire center-of-gravity.
d. Calculate the longitudinal center-of-gravity and percent MAC. Refer to the Airplane
Weighing Form for formulas required.
NOTE
The center-of-gravity is sensitive to proper leveling and landing gear oleo extension
measurements.
Assessing Airplane Weight and Center-of-Gravity Results
1. Evaluate the weight and center-of-gravity values.
If the weight and center-of-gravity do not appear to be correct, based on the last weight or
continuous history, lower the airplane, remove the scales or load cells, rotate all three
scales to a different location and reweigh the airplane as described above.
2. Compare the weight and center-of-gravity values from the second weighing to the values
recorded earlier.
A third weighing will be required if the overall weight varies by more than 40 pounds (18
kilograms) or the center-of-gravity differs by more than 0.31 inches (8 millimeters).
3. If after the third weighing, the weight and center-of-gravity still have wide variations from
previous values, the airplane should be reweighed again on a known accurate set of scales.
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