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Pressurization

Pressurization. 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%. Why pressurization?. This results in a diminishing time of useful consciousness (TUC)… 20,000 ft – 30 minutes

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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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