AMC1 NCC.POL.105(b) Mass
and balance, loading
WEIGHING OF AN AIRCRAFT
(a) New aircraft that have been weighed at the factory may be placed into operation without reweighing if the mass and balance records have been adjusted for alterations or modifications to the aircraft. Aircraft transferred from one EU operator to another EU operator do not have to be weighed prior to use by the receiving operator, unless the mass and balance cannot be accurately established by calculation.
(b) The mass and centre of gravity (CG) position of an aircraft should be revised whenever the cumulative changes to the dry operating mass exceed ±0.5 % of the maximum landing mass or for aeroplanes the cumulative change in CG position exceeds 0.5 % of the mean aerodynamic chord. This should be done either by weighing the aircraft or by calculation.
(c) When weighing an aircraft, normal precautions should be taken, which are consistent with good practices such as:
(1) checking for completeness of the aircraft and equipment;
(2) determining that fluids are properly accounted for;
(3) ensuring that the aircraft is clean; and
(4) ensuring that weighing is accomplished in an enclosed building.
(d) Any equipment used for weighing should be properly calibrated, zeroed and used in accordance with the manufacturer's instructions. Each scale should be calibrated either by the manufacturer, by a civil department of weights and measures or by an appropriately authorised organisation within 2 years or within a time period defined by the manufacturer of the weighing equipment, whichever is less. The equipment should enable the mass of the aircraft to be established accurately. One single accuracy criterion for weighing equipment cannot be given. However, the weighing accuracy is considered satisfactory if the accuracy criteria in Table 1 are met by the individual scales/cells of the weighing equipment used:
Table
1: Accuracy criteria for weighing equipment
|
For a scale/cell load |
An accuracy of |
|
below 2 000 kg |
± 1 % |
|
from 2 000 kg to 20 000 kg |
± 20 kg |
|
above 20 000 kg |
± 0.1 % |
EU aviation rules mandate accurate aircraft weight and balance for safe operations. Re-weighing isn't always needed for new or transferred aircraft if records are updated. Significant weight/balance changes require revision via weighing or calculation. Weighing must follow precise procedures using calibrated equipment, meeting specific accuracy standards based on load.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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