Description Of The Flight Recorder Systems

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The parameters that are mandatory and those that are only recommended depend of the type of the aircraft.
ICAO – A8 - 2.2.2.6 Type IA FDR
This FDR shall be capable of recording, as appropriate to the aeroplane, at least the 78 parameters in Table A8-1
ICAO – A8 - 2.2.2.7 Type I FDR.
This FDR shall be capable of recording, as appropriate to the aeroplane, at least the first 32 parameters in Table A8-1.

Table giving the parameters to record, the required precision and frequency (Extract)

Tests for crash protected devices

The manufacturers have to ensure to the authorities that their systems will be still usable even after a crash. Therefore they have to demonstrate its reliability in extreme case through tests and certifications.
ICAO – A8 - 1.3 The flight recorder systems, when tested by methods approved by the appropriate certificating authority, shall be demonstrated to be suitable for the environmental extremes over which they are designed to operate.
1.5 The manufacturer shall provide the appropriate certificating authority with the following information in respect of the flight recording systems:
a) manufacturer’s operating instructions, equipment limitations and installation procedures;
b) Parameter origin or source and equations which relate counts to units of measurement; and
c) Manufacturer’s test reports

The tests are supposed to simulate a crash of the aircraft so it has to be submitted to intense solicitations. To assure that the conditions are

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