NPA 2025-01

This NPA proposes to require some large aeroplanes to be equipped with a take-off performance monitoring system (TOPMS). The proposal addresses new designs, with an amendment of the Certification Specifications and Acceptable Means of Compliance for Large Aeroplanes (CS-25), and some already approved designs when the aeroplane is still in production and operated in commercial air transport, with an amendment of Part-26 (Annex I to Regulation (EU) 2015/640) and, subsequently, of the Certification Specifications and Guidance Material for Additional Airworthiness Specifications for Operations (CS-26).

The objective is to mitigate, using an on-board alerting system, the risk of large aeroplane accidents or incidents caused by the use of erroneous take-off performance parameters and erroneous take-off positions. Such errors have the potential to result in runway excursions and aeroplane upsets, with subsequent loss of control and collision with terrain or obstacles.

The proposed regulatory material is expected to improve safety while limiting manufacturers’ efforts in the development and implementation of TOPMS functions to the most beneficial cases. Low- to very low-cost impact is expected. No environmental and social impacts have been identified.