Flight data recorders: filtered data.

CFR · 2024-01-01 · US · Title 14

(a) A flight data signal is filtered when an original sensor signal has been changed in any way, other than changes necessary to: (1) Accomplish analog to digital conversion of the signal; (2) Format a digital signal to be DFDR compatible; or (3) Eliminate a high frequency component of a signal that is outside the operational bandwidth of the sensor. (b) An original sensor signal for any flight recorder parameter required to be recorded under § 135.152 may be filtered only if the recorded signal value continues to meet the requirements of Appendix D or F of this part, as applicable. (c) For a parameter described in § 135.152(h)(12) through (17), (42), or (88), or the corresponding parameter in Appendix D of this part, if the recorded signal value is filtered and does not meet the requirements of Appendix D or F of this part, as applicable, the certificate holder must: (1) Remove the filtering and ensure that the recorded signal value meets the requirements of Appendix D or F of this part, as applicable; or (2) Demonstrate by test and analysis that the original sensor signal value can be reconstructed from the recorded data. This demonstration requires that: (i) The FAA determine that the procedure and test results submitted by the certificate holder as its compliance with paragraph (c)(2) of this section are repeatable; and (ii) The certificate holder maintains documentation of the procedure required to reconstruct the original sensor signal value. This documentation is (d) (

official document · source cfr-2024 · id 14:§ 135.156