ATC 'on conversion'........

[NacelleStrake]

What does 'on conversion' mean please?

[hvogt]

In which context?

[mr ripley]

When speed converts from a Mach number to a number indicated in knots.

[NacelleStrake]

Epiphany. Thank-you Mr Ripley...

[jc2065]

I believe you're referring to the point in descent at which jet aircraft revert to using indicated airspeed as opposed to Mach number. So ATC might say to a descending aircraft using a Mach speed; "Speedbird 123, make your speed 260 knots on conversion"

And when the aircraft descends through the point at which it starts using indicated airspeeds again, 260 knots is the ATC-imposed speed limit.

[jc2065]

What he said....

[mr ripley]

Prefer to hear '300 kts or greater on conversion'!

[Nubboy]

On airbi when asked to pedal hard seems to be somewhere aroun FL290.

Doubtless a question on the techies forum would give a more complete answer.