Bristell B23
Airplane Maintenance Manual
Chapter 08
Issue: 30-Sep-2020
Chapter 08 Page 3
Nominal Geometric Lever Arms and Lengths
Nose gear ground contact X_N............................... 0.588 m
Main gear ground contact X_L, X_R........................ 2.062 m
MAC..................................................................... 1.343 m
MAC Leading edge (MAC
LE
).................................... 1.377 m
Airplane Weighing Procedure
▶
Prepare aircraft by off-loading any luggage and loose
items which are not part of the standard equipment.
▶
Check coolant and oil filled, replenish if needed.
▶
Drain fuel.
▶
Replenish unusable fuel (1.0 Litre each wing tank).
▶
Level airplane on scales (refer to Chapter 08-20).
▶
Determine individual weight on all three gears (W_N,
W_L, W_R).
▶
Check gear lever arms (X_N, X_L, X_R; reference propeller
flange X=0.0m, or firewall X=0.960m).
▶
Calculate Empty Weight:
W_empty = W_N+W_L+W_R
▶
Calculate Empty airplane moment:
M_empty = WN*X_N + W_L*X_L + W_R*X_R
▶
Calculate Empty Airplane CG:
CG_empty = M_empty/W_empty
▶
Record date, empty weight, moment and CG in the Empty
Aircraft Weight and Balance Record (see 08-10-01).
▶
Check aircraft is within limits given in Chapter 08-10-02
Weight and Balance Envelope Limits
.
▶
If it is not contact the manufacturer.