ED Decision 2025/010/R
CENTRE OF GRAVITY (CG) LIMITS — OPERATIONAL CG ENVELOPE AND IN-FLIGHT CG
(a) Forward and aft CG limits are specified in the AFM. These limits allow for a proper trim setting for take-off and ensure that the certification stability and control criteria are met throughout the whole flight.
(b) The IAM operator should ensure that these limits are respected by:
(1) defining and applying operational margins to the certified CG envelope in order to compensate for the following deviations and errors:
(i) deviations of the actual CG at empty or operating mass from published values due, for example, to weighing errors, unaccounted modifications and/or equipment variations;
(ii) deviations in the distribution of baggage and cargo in the various compartments as compared with the assumed load distribution as well as inaccuracies in the actual mass of baggage and cargo;
(iii) deviations in the actual passenger seating from the seating distribution assumed when preparing the mass and balance documentation. Large CG errors may occur when ‘free seating’, i.e. freedom of passengers to select any seat when entering the VCA, is permitted;
(iv) deviations of the actual CG of cargo and passenger load within individual cargo compartments or cabin sections from the normally assumed mid position;
(v) deviations of the CG caused by any configuration change, unless already covered by the certified limits;
(vi) deviations caused by in-flight change of loading;
(vii) deviations caused by the difference between the actual passenger masses and standard passenger masses when such masses are used; and
(2) defining and applying operational procedures in order to:
(i) ensure even distribution of passengers in the cabin;
(ii) take into account any significant CG travel during flight caused by passenger/crew movement; and
(ii) take into account any significant CG travel during flight caused by fuel consumption, if applicable.
AMC1 UAM.POL.VCA.140 requires IAM operators to respect certified CG limits by applying operational margins and procedures, covering deviations and in-flight CG travel.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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