21-13. OXYGEN SYSTEMS
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1. The replenishment of an onboard oxygen bottle must be done:
2. A public transport aircraft has a cruising altitude of FL390. It is fitted with individual oxygen masks for the passengers. In the event of depressurization, the masks must be automatically released before the cabin pressure altitude exceeds:
3. Generally speaking when the oxygen flows to the masks in the passenger cabin, the system is activated by:
4. In case of smoke in the cockpit, the crew oxygen regulator must be set to:
5. What is supplementary oxygen used for in a pressurised aircraft?
