The ATR doesn't have drop down Ox masks.
It has fixed Ox outlets overhead pax seats.
As far as I know the max FL250 is set by the max differential of the pressurisation system. Any higher than the max diff will set off the CCAS CRC
[Centralised Crew Alerting Syst. Continuous Repetitive Chime]
edit cant spell Continuous
Last edited by dv8; 16th May 2002 at 18:48.