ED Decision 2020/024/R

Installation and maintenance of recorders – certification aspects, Tyre pressure monitoring, Regular update of CS-25

CS-25 Amendment 26

The objective of this Decision is to: 

  1. improve the availability and the quality of data recorded by flight recorders in order to better support safety investigations of large aeroplane accidents and incidents; 
  2. decrease the risk of a hazardous or catastrophic tyre failure of a large aeroplane that is caused by inadequate tyre inflation pressure;
  3. reflect the state of the art of large aeroplane certification and improve the harmonisation of CS-25 with the Federal Aviation Administration (FAA) regulations; and
  4. make editorial corrections.

This Decision amends CS-25 to: 

  1. provide certification specifications (CS) and acceptable means of compliance (AMC) for flight recorders performing the data link recording function; introduce into AMCs for flight recorder installations new sections explaining the expectations in terms of instructions for continued airworthiness (ICA); introduce into AMC 25.1457 a new section explaining how to perform evaluations of cockpit voice recorder (CVR) recordings; and amend CS 25.1457 for CVRs to allow the use of more than four channels;
  2. require a means to minimise the risk that a tyre is below its minimum serviceable inflation pressure during operation; 
  3. introduce amendments addressing various selected non-complex, non-controversial, and mature subjects: Go-around handling qualities and performance; Minimum control speeds; Fuel tank and system lightning protection; Cabin safety; Electronic AFMs – computation of misleading primary information; On-board weight and balance systems; Air conditioning systems; Flight guidance systems; Primary flight displays during unusual attitude and declutter modes; Lightning protection and electrical bonding and protection against static electricity; and Operation without normal electrical power; and
  4. make editorial corrections in CS 25.807, Emergency exits.

The amendments are expected to increase safety without any significant economic impact, and with no environmental or social impact. This will also support large aeroplane operators in ensuring the serviceability of flight recorders, and streamline the CS-25 certification process, thereby providing an economic benefit for operators, CS-25 certification applicants, and EASA.