Robinsons R66 - Page 130

Page 8.8 Chapter 8 Weight and Balance R66 Maintenance Manual SEP 2012
8-22 Weighing Procedure and Calculations (continued)
6. Calculate weight and CG per the following table. Adjust ballast per steps 6b thru 6e as
required until calculated CG is between 101.50 and 102.50 per step 6a.
Item Weight (lb)
Longitudinal CG
(arm, inches) Moment (in.-lb)
Forward Net: x 32.67 =
Left Net: x 127.35 =
Right Net: x 127.35 =
Pilot (right forward seat; add): 160.00 x 49.00 = 7840.00
Unusable fuel (add): 6.70 x 110.40 = 739.68
Calculated weight and CG:
a. If Calculated CG is between 101.50 and 102.50, (additional) ballast is not required.
Proceed to step 7.
b. If Calculated CG is less than 101.50 and nose ballast is not installed, install empennage
ballast per Section 8-32. Reweigh helicopter and calculate new weight and CG per
the previous steps.
c. If Calculated CG is less than 101.50 and nose ballast is installed, determine (minimum)
nose ballast to remove:
(102.50 - Calculated CG) X Calculated weight
=
97.35 lb
Round down to nearest 0.25 lb. Remove nose ballast per Section 8-31. Reweigh
helicopter and calculate new weight and CG per the previous steps.
d. If Calculated CG is greater than 102.50 and empennage ballast is installed, remove
empennage ballast per Section 8-32. Reweigh helicopter and calculate new weight
and CG per the previous steps.
e. If Calculated CG is greater than 102.50 and empennage ballast is not installed,
determine (minimum) additional nose ballast required:
(Calculated CG - 102.50) X Calculated weight
=
97.35 lb
Round up to nearest 0.25 lb. Install nose ballast per Section 8-31. Reweigh helicopter
and calculate new weight and CG per the previous steps.
7. Lower helicopter per Section 7-10. Secure aft tunnel cover.