Game Composites GB1 GameBird, Maintenance Manual

Page: 35 / 269

Maintenance Manual GB1 GameBird
Page date: April 24, 2020
8-2
Establish Empty Weight & Centre of Gravity
1. Drain all fuel tanks to unusable fuel level (see 12-06 )
2. Empty the smoke oil tanks (see 12-06 )
3. Remove optional tail ballast (see 41-02 )
4. Ensure engine oil and brake fluid levels are correct
5. Ensure that all loose baggage and non-fitted equipment
is removed from the airplane
6. Position calibrated scales (capable of minimum 300 kg
each) under each wheel
7. Raise and support tail wheel to put airplane in level
attitude: use cockpit frame by the side aft of the
windshield frame as reference. Place a spirit level in the position as shown in red and adjust tail
support to level attitude.
8.
Fill in below table and follow formula to obtain empty weight and center of gravity position:
W
ML
= weight on Main gear - left: _______ lb or kg
W
MR
= weight on Main gear - right: _______ lb or kg
W
T
= weight on tail wheel _______ lb or kg
L
M
= distance from main wheels to firewall = 10.6 in or 0.27 m
L
T
= distance from tail wheel to firewall = 198.4 in or 4.81 m
W
M
= weight on main wheels = W
ML
+ W
MR
= _______ lb or kg
W
o
= empty weight = W
M
+ W
T
= _______ lb or kg
M
M
= moment of main wheels = W
M
x L
M
= _______ in/lb or kg/m
M
T
= moment of tail wheel = W
T
x L
T
= _______ in/lb or kg/m
M
o
= moment of empty weight CG
L
o
= empty weight CG, distance to firewall
𝐿
𝑜
=
𝑀
𝑜
𝑊
𝑜
=
𝑀
𝑀
+ 𝑀
𝑇
𝑊
𝑀
+ 𝑊
𝑇