III. How a plane can fly assuring safety ? 3. Flight at high altitude Session 2: How works a pressurized fuselageSession 2: How works a pressurized fuselage
Objective: Explain that a fuselage of an airplane designed to fly at high altitude, besides other loads has to withstand a differential pressure between the external (atmosphere static) pressure and the internal thermodynamic pressure.
Explanation:
The teaching materials will utilized to give show how the fuselage skin withstand a differential pressure
Material:
- Multimedia black board + Power Point Like Software
- Photos / Videos
- Pictures
Figure 7 Pressurized Fuselage
Main activities
- By utilizing pictures (and eventually photos) and experimentations the students will learn how the fuselage skin withstand differential pressure
- Student will be asked to make a comparison with a submarine vehicle
Maximum duration:
60 minutes
Main question to be asked:
- What is the impact of fuselage capability to withstand to a differential pressure on the airplane characteristics?
- Ask to the students if they know some suggested procedures in case of a fuselage failure
Developing of Activity
- Make the students to perform experimentation
- Explain to the students by pictures how a pressurized fuselage withstand the differential pressure
- Make the students to discuss about this kind of problems
Results of Activity
- The differential pressure is balanced by internal skin capability to with stand traction loads
- The differential pressure could cause a fuselage local skin failure or the doors to be open
- Emergency procedures consists for pilots to get quickly a lower altitude and for passengers and crew to use the oxygen masks
Experiment 1: Static Airplane Model
Description
- Take a static airplane model (as completed as possible in every its elements).
- Ask the student to tell the functions of each element.
- Discuss with students about forces acting on each elements.
Figure 15 Airplane Parts
Explanation
Each part of a transport airplane has more than one function. One of the most important is: withstand loads. The way each part is designed depends on their function and on the kind of loads they have to withstand to.
Results
To withstand loads is one of the most important function of an airplane element. The kind of loads explains the choice of the material of that element.
