What does Pressurisation & Air Conditioning cover?
Pressurisation keeps the cabin at a comfortable, safe altitude while the aircraft cruises high. This topic covers how cabin pressure is controlled with bleed air and outflow valves, and the protective devices against over- and under-pressure.
What this subject covers
- Cabin altitude, differential pressure and the schedule
- Bleed air, packs and outflow valves
- Safety/relief valves and protections
- Effects of decompression
Study tip
Keep differential pressure and cabin altitude distinct in your mind — many questions test the relationship between the two as the aircraft climbs.
Frequently asked questions
What controls cabin pressure?
The outflow valve regulates how much conditioned (bleed) air escapes, setting the cabin pressure according to the pressurisation schedule.
What is differential pressure?
The difference between cabin pressure and the lower outside pressure; the structure is certified to a maximum value.
