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Old 26th Oct 2016, 18:27
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Lantirn
 
Join Date: May 2007
Location: FL390
Age: 38
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BUSS FL250
In unreliable speed (all ADR's affected) you have to descend to FL250 to enable BUSS.

However in triple ADR fault, executing the ALL ADR OFF procedure, there is no need to descend to FL250 for BUSS switching. Or at least it is not documented in the QRH or in the ECAM.

I know that the BUSS is valid below FL250 due to mach number effects in AOA vanes.

Any input?
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