1. Don the oxygen masks.
2. Establish crew communications.
3. Check the cabin altitude and rate.
4. If the cabin altitude is uncontrollable: Without delay, descend to the lowest safe altitude or 10,000 feet, whichever is higher.
- To descend:
- - Move the thrust levers to idle
- - Extend the speedbrakes
- - If structural integrity is in doubt, limit airspeed and avoid high maneuvering loads.
- - Descend at VMO/MMO