For all-engine-out rapid relight, what is the altitude range in which it has been demonstrated?

The correct choice regarding the altitude range for all-engine-out rapid relight is the range from 10,000 feet to sea level. This range is significant as it indicates the operational parameters in which the aircraft's systems and engines can still perform a successful relight after a dual engine failure.

Operating above 10,000 feet provides sufficient airflow and pressure conditions necessary for the engines to restart after they have been shut down. At altitudes lower than this, particularly near sea level, there's still an adequate atmospheric density to facilitate engine relight. The procedures are designed with this altitude range in mind, as performance data and tests have shown that relight attempts are most effective within these parameters. Understanding this limitation is crucial for pilots, not only for safety but also for effective decision-making in emergency situations.

In aviation practice, being aware of these specific altitude limitations aids in preventing reliance on conditions that exceed the proven performance criteria outlined by the manufacturer and aviation authority regulations.