Permitted payload-range and CG envelope
The JS-3 CG envelope is based on the allowable flying mass and CG
ranges given in Section 2.5 and Section 2.6.
Care must be taken that the CG stays within the allowable limits. The
following loads have an effect on the CG position:
• Pilot
• Cockpit ballast (removable)
• Water ballast: Main tank (and tip tanks in 18 m configuration)
• Water ballast: Expendable tail tank
• Non-expendable tail tank
• Baggage
• O
2
bottle
• Fuselage water ballast
• Fin ballast
Adjustment possibilities, such as cockpit ballast, lead tail ballast and
water in the non-expendable tail tank (top fin tank), is available to help
the pilot achieve the desired CG position.
The expendable water tank in the fin (bottom fin tank) is used to offset
the CG change due to the water ballast in the main wing tanks. No
change in the set CG is expected during dumping when this tank is
correctly loaded.
Figure 6.3-1 and Table 6.3-1 give the maximum mass and the moment
arms of the various variable loads for the JS-3 with a single non-
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