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<blockquote data-quote="imhotep" data-source="post: 30473867" data-attributes="member: 562115"><p>I wasn't missing the context and commenting on fail-safe. </p><p></p><p>BTW both the FDR & CVR are powered from the engines. FDR is powered by Engine #1 via the AC TFR BUS 1 while the CVR is powered by Engine#2 via the AC TFR BUS 2. </p><p>In case of one engine failure the power is fed via the other engine or by the APU via a Tie Bus.</p><p>The battery backup is optional (but no cost option) in which case these devices are powered by DC sources.</p></blockquote><p></p>
[QUOTE="imhotep, post: 30473867, member: 562115"] I wasn't missing the context and commenting on fail-safe. BTW both the FDR & CVR are powered from the engines. FDR is powered by Engine #1 via the AC TFR BUS 1 while the CVR is powered by Engine#2 via the AC TFR BUS 2. In case of one engine failure the power is fed via the other engine or by the APU via a Tie Bus. The battery backup is optional (but no cost option) in which case these devices are powered by DC sources. [/QUOTE]
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