CS 25.1460 Data link recorders — CS-25

IRImplementing rule

CS 25.1460Data link recorders

(See AMC 25.1460)

(a)Each recorder performing the data link recording function required by the operating rules must be approved and must be installed so that it will record data link communication messages related to air traffic services (ATS) communications to and from the aeroplane.

(b)Each data link recorder must be installed so that:

(1)(i) it receives its electrical power from the bus that provides the maximum reliability for the operation of the recorder without jeopardising service to essential or emergency loads; and

(ii)it remains powered for as long as possible without jeopardising the emergency operation of the aeroplane;

(2)there is an aural or visual means for pre-flight checking of the recorder for the proper recording of data in the storage medium; and

(3)if the recorder is deployable, it complies with CS 25.1457(d)(7).

(c)If the recorder is not deployable, the container of the recording medium must be located and mounted so as to minimise the probability of the container rupturing, the recording medium being destroyed, or the underwater locating device failing as a result of any possible combinations of:

(1)impact with the Earth’s surface;

(2)the heat damage caused by a post-impact fire; and

(3)immersion in water. If the recorder is deployable, the deployed part must be designed and installed so as to minimise the probability of the recording medium being destroyed or the emergency locator transmitter failing to transmit (after damage or immersion in water) as a result of any possible combinations of:

(1)the deployment of the recorder;

(2)impact with the Earth’s surface;

(3)the heat damage caused by a post-impact fire; and

(4)immersion in water.

(d)The container of the data link recorder must comply with the specifications applicable to the container of the cockpit voice recorder in CS 25.1457(g).

[Amdt 25/26]

IR · CS 25.1460 — CS-25 · ED Decision 2020/024/R · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

AMCAcceptable means of compliance

AMC 25.1460Data link recorders

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1.General The installation of a recorder with an ETSO authorisation against ETSO-C177a (or an equivalent standard accepted by EASA) satisfies the approval requirement in CS 25.1460(a). In showing compliance with CS 25.1460, the applicant should take into account EUROCAE Document ED-112A, ‘Minimum operational performance specification for crash protected airborne recorder systems’, dated September 2013, or a later revision. ‘DLR system’ designates the data link recorder (DLR) and its dedicated equipment. It may include the following items as appropriate to the aircraft: a. A crash-protected recorder. b. Digital interface equipment suitable for converting a data link communication message into a format which is to be recorded. c. Digital data busses and/or networks providing communications between elements of the system. The data link recording function may be performed by: a. a cockpit voice recorder; b. a flight data recorder; c. a flight data and cockpit voice combination recorder; or d. a dedicated data link recorder.

2.Combination recorders Refer to the Section of AMC 25.1457 titled ‘Combination recorder’.

3.Recorded data The recorded data should be sufficient to allow investigators, in the framework of an accident or incident investigation, to accurately reconstruct the sequence of data link communications between the aircraft and air traffic service units, other aircraft and other entities. For this purpose, the data link recording should comply with: a. EUROCAE Document ED-93 (dated November 1998), ‘Minimum aviation system performance specification for CNS/ATM message recording systems’, Section 2.3.1, Choice of recording points, and Section 2.3.2, Choice of data to be recorded on board the aircraft; and b. EUROCAE Document ED-112A (dated September 2013), ‘Minimum operational specification for crash protected airborne recorder systems’, Part IV, Chapter IV-2, Section IV-2.1.6, Data to be recorded.

4.Instructions for Continued Airworthiness (ICA) When developing the ICA for the DLR system, as required by CS 25.1529 and Appendix H, the applicant should address all the failures that may affect the correct functioning of the DLR system or the integrity of the recorded information. Examples of failures (indicative and non-exhaustive list): Loss of the recording function or of the acquisition function of the DLR; Part of the data link communication (required by CS 25.1460(a) or by the applicable air operations regulations) is missing or corrupted; Failure of a means to facilitate the finding of the DLR recording medium after an accident (e.g. an underwater locating device or an emergency locator transmitter attached to the recorder); Failure of a means to detect a crash impact (for the purpose of stopping the recording after a crash impact, or for the purpose of deploying the recorder if it is deployable). In addition, the ICA should include the following item, unless the applicant shows that this is not applicable: Documentation to perform the following: i. Convert the recorded data back to the original format of the data link communication messages, ii. Retrieve the time and the priority of each recorded message, and iii. Correlate the recorded messages with the FDR and CVR recordings.

[Amdt 25/26]

AMC · AMC 25.1460 — CS-25 · ED Decision 2020/024/R · CS-25 Easy Access Rules · EAR revision 26 Jan 2023