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Swissair 111

Printed page 74. PDF page 86.

thereby simultaneously disabling the FDR and the CVR. With both the CVR and the FDR on the same generator bus, a failure of that bus, or the intentional disabling of the bus (e.g., as a result of checklist actions in
Open final report at PDF page 86TSB A98H0003: In-flight fire leading to collision with water

Swissair 111

Printed page 256. PDF page 268.

were powered from separate electrical buses; however, the buses received power from the same generator; this configuration was permitted by regulation. Both recorders stopped recording at almost the same time because of fire-related power interruptions; independent sources
Open final report at PDF page 268TSB A98H0003: In-flight fire leading to collision with water

Swissair 111

Printed page 264. PDF page 276.

thereby simultaneously disabling the FDR and the CVR. With both the CVR and the FDR on the same generator bus, a failure of that bus, or the intentional disabling of the bus (e.g., the result of checklist actions in an
Open final report at PDF page 276TSB A98H0003: In-flight fire leading to collision with water

Swissair 111

Printed page 209. PDF page 221.

aircraft where the CVR and the flight data recorder (FDR) are both powered from the same aircraft generator bus, both recorders would stop recording at the same time if that generator bus went off-line. Although the current requirement to power
Open final report at PDF page 221TSB A98H0003: In-flight fire leading to collision with water