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Pressurization

Learn about the importance of pressurization for aircraft cabins to ensure passenger comfort and safety at high altitudes. Discover the impact of altitude on human breathing and the critical role of pressurization in maintaining a safe cabin environment.

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Pressurization

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  1. Pressurization

  2. Why pressurization? • Humans have trouble breathing at higher altitudes… • Sea Level – 100% • 10,000 ft – 90% • 15,000 ft – 75% • 20,000 ft – 40% • 25,000 ft – 0%

  3. Why pressurization? • This results in a diminishing time of useful consciousness (TUC)… • 20,000 ft – 30 minutes • 25,000 ft – 3 – 5 min • 30,000 ft – 1 – 4 min • 35,000 ft – 30 – 60 sec • 40,000 ft – 15 – 20 sec • 45,000 ft – 9 – 15 sec!

  4. How much pressurization? • Based on differential pressure • Ratio of outside pressure (at altitude) to inside pressure • Beech Baron – 3.6 PSID • Altitude 15,000’ – cabin 6,000’ • Boeing B-737 – 7.8 PSID • Altitude 37,000’ – cabin 8,000’ • Chart on next page

  5. Requirements for pressurized flight • Cabin strong enough to withstand pressure differential • Source of pressurized air • Drawn from turbocharger or supercharger • Turbine engine uses bleed air from compressor • Method to control pressurization • Cabin pressure controller • Outflow valve(s)

  6. Source of pressurized air • Air Pump • Roots – type • Vane type • Hydraulic lesson

  7. Pressurization Control Panel • Rate Selector Knob • Control pressure changes • Cabin Altitude Selector Knob • Sets desired cabin altitude • Barometric Pressure Correction Knob

  8. Pressurization Control Panel

  9. Pressurized Flight Profile

  10. Pressurization System

  11. Larger Aircraft Similar • Higher pressurization differentials • Same Basic Components • Source, • Control Mechanism • Outflow Valves

  12. Pneumatics

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