Review Graph "A" from an overhead transparency. This is another look at the data the students graphed in Activity 1. Spend time pointing out the features of the airplane illustration (i.e. the direction of the wind gust, the restoration of the pitch moment, the similarity, in this case, of the beginning and ending flight path angle.

Next, closely review the graph relating what the airplane is doing in the illustration to the points indicated along the slope. The text in between the illustration and the graph contains that information. Note that the airplane will react in a similar manner even if the elevator was set at ­10 degrees or +10 degrees, hence the similar slope of all 3 lines.

Change the graph scenario by stating that instead of encountering turbulence, the pilot changed the elevator to +10 degrees.

Ask the question: What would be the new position for point "B"?
Answer: 0.002, 2

Ask the question: What would be the new position for point "C"?
Answer: 0.000, 6

Change the graph scenario again by stating that instead of encountering turbulence, the pilot changed the elevator to ­10 degrees.

Ask the question: What would be the new position for point "B"?
Answer: -0.002, 2

Ask the question: What would be the new position for point "C"?
Answer: -0.004, 6

Instruct the students that while working in small groups they will be given a graph to analyze. They must determine which of the following 4 scenarios below is being shown by the data on their graph. Have them follow the steps below:

1. Analyze the graph noticing the arrows.
2. Draw a diagram of an airplane as it moves according to the information depicted in the graph.
3. State which scenario the graph and drawing represent.

"

Scenario 1
Aircraft at flight condition "A" encounters a gust of wind that pitches the nose down. The aircraft responds with a new pitching moment and pitches the nose up again to its original flight path angle.

Scenario 2
Aircraft at flight condition "A", the pilot changes the elevator position to +10 degrees. Aircraft responds by pitching up to new trimmed flight path.

Scenario 3
Aircraft at flight condition "A", encounters a gust of wind that pitches the nose up to position "B". The pilot responds to the gust by setting the elevator to +10 degrees. The aircraft is at its new trimmed flight path at position "C".

Scenario 4
Aircraft at flight condition "A" encounters a strong gust of wind and pitches up to condition "B". The pilot responds by setting the elevator to +10 degrees at condition "C". This stable airplane responds by pitching the nose down to point "D" which is a new trimmed stable flight path.

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