796 Empty Weight and CG Measurement While on Gear
100654-02
Use this procedure to determine the weight and balance condition of the
A5 on its landing gear.
Instructions are for Garmin 796 equipped aircraft.Applicable Aircraft Serial Numbers
All
Type of Maintenance
Line
Level of Certification
LSA-RM
Task Specific Training Required
No
Special Tools Required
None
Parts Required
None
Aircraft System and Number
NA
Safety Equipment
As Needed
Consumable
None
Task Instructions
Verify the following conditions are met before performing the weight and CG measurement procedure:
• The airplane empty weight includes engine oil and coolant, unusable fuel, hydraulic brake fluid, and installed equipment for the aircraft.
• The airplane must be weighed and leveled in a level area. The weighing area should also be calm or indoors to prevent wind from affecting the readings.
• Check the calibration of the scales used to ensure accurate results.
• Check the oil dipstick to verify at least 3.17 quarts (three liters) of oil. Service as necessary.
• The difference between the max and the min marks is approximately 0.5 quarts (0.47 l).
• Retract flaps to the 0° position.
• Center all controls to the neutral, static position.
• Install removable side windows.
• Close and latch the canopy.
• Ensure all inspection covers and panels are installed.
• Brake fluid properly serviced.
• Bilge pump shall be run to ensure no water is in the aircraft.
• The wings shall be confirmed free of water.
• All control surfaces (ailerons, elevator, flaps) shall be checked and drained of water.
• The BRS Safety Pin for the Complete Aircraft Parachute shall be installed.
• The key shall be in the aircraft, installed in the ignition switch.
• All aircraft accessories are to be removed: Wind Deflectors, Tie Downs, Headsets, Removable Garmin, etc.
• POH must be in the aircraft, located in the co-pilot seatback pocket.
• Left and right hand rudder pedals must be in the most aft position.
• Verify all three (3) jacks are properly inserted in the jack points and are on the center of the scale (if used).
1. Install the platform scales under the two Main Gear and Nose Gear.
3. Shim or block up the aircraft so that the bubble level beneath the right-side floorboard indicates a level condition.
5. Record the weight readings on the scales under the Nose Gear, RH Main Gear, and LH Main Gear.
6. Complete the Empty Weight and CG Calculation Form and perform the calculations to obtain the total empty weight and CG position.
Verification Method
Fill out blank cells in table below.
Scale Position | Weight, Wt (lbf) | Arm, FS (in) | Moment, M=Wt x Arm (lbf-in) |
|---|
Nose Gear | | 84.5 | |
Right Main Gear | | 176.0 | |
Left Main Gear | | 176.0 | |
Total | | | |
Total Weight (lbf) | CG Position—FS (in) |
|---|
| |
Calculate the FS location of the CG by dividing the total moment by the total weight.
Total Wt (from above)=______ lbs
Aircraft CG Location, FS (Total M/Total Wt)=______ in
Verify that the above readings and calculations make sense by comparing them with the Pilot’s Operating Handbook (POH) records. Enter the new weight and balance information as a new baseline in the POH.
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