| We carry Enroute Diversion Guides for those routes where terrain is likely to be a problem in the event of an engine failure or depressurisation. The guide depicts the minimum altitude to be flown for each segment of the route and also shows any applicable escape routes.
Minimum dispatch oxygen pressures (for crew and pax systems) have been calculated for the routes we fly, and cater for a depressurisation at the worst place enroute. Provided we dispatch with at least the minimum oxygen pressure for the route, there will be enough oxygen available for the crew and pax, even if the terrain dictates a minimum altitude greater than 10,000ft for some time after the depressurisation.
The EGPWS is designed as a warning system, not as a tool for planning an escape route. I'm sure most would agree that to use it as a planning tool would be pure folly. |