---
title: "NCO.POL.105 Weighing — Part-NCO · Avioverse"
description: "The operator shall ensure that the mass and, the CG of the aircraft have been established by actual weighing prior to the initial entry into service of…"
url: "https://avioverse.aero/regulations/easa/air-ops/part-nco/subpart-c/nco-pol-105"
---

# NCO.POL.105 Weighing

ANNEX VII (Part-NCO) · Regulation (EU) No 965/2012 · EAR revision 27 Mar 2026

IR Implementing rule

## NCO.POL.105 Weighing

(a) The operator shall ensure that the mass and, the CG of the [aircraft](https://avioverse.aero/glossary/easa/aircraft) have been established by actual weighing prior to the initial entry into service of the aircraft. The accumulated effects of modifications and repairs on the mass and balance shall be accounted for and properly documented. Such information shall be made available to the pilot-in-command. The aircraft shall be reweighed if the effect of modifications on the mass and balance is not accurately known.

(b) The weighing shall be accomplished by the manufacturer of the aircraft or by an approved maintenance organisation.

IR · NCO.POL.105 — Regulation (EU) No 965/2012 · Regulation (EU) 2018/1975 · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

GM Guidance material

## GM1 NCO.POL.105 Weighing

GENERAL

(a) New [aircraft](https://avioverse.aero/glossary/easa/aircraft) that have been weighed at the factory may be placed into operation without reweighing if the mass records 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 should be revised whenever the cumulative changes to the [dry operating mass](https://avioverse.aero/glossary/easa/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 may be done by weighing the aircraft or by calculation. If the AFM requires to record changes to mass and CG position below these thresholds, or to record changes in any case, and make them known to the pilot-in-command, mass and CG position should be revised accordingly and made known to the pilot-in-command.

GM · GM1 NCO.POL.105 — Regulation (EU) No 965/2012 · ED Decision 2018/003/R · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

[All rules in SUBPART C: AIRCRAFT PERFORMANCE AND OPERATING LIMITATIONS](https://avioverse.aero/regulations/easa/air-ops/part-nco/subpart-c)

Consolidated from the EASA Easy Access Rules (revision 27 Mar 2026, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.