USE OF SUPPLEMENTAL OXYGEN (UNPRESSURIZED)
1. Oxygen Masks - NORMAL below 25,000 cabin altitude.
100% at or above 25,000 feet.
Ensure crew and passengers are receiving oxygen.
2. Cabin Altitude - MAX 25,000 FEET with passengers.
MAX 41,000 FEET crew only.
3. Oxygen - CHECK ENDURANCE (Refer to Figure 3-4).
4. Range - COMPUTE (based on oxygen endurance and revised fuel flow and ground speed).