12 - 18 CRP 5 Computer

Question 1

Using the CRP 5, given the following information, what is the process of calculating the Track and the Ground Speed?

• Hdg
• W/V
• TAS

Answer 1

1. Set the wind direction on the inner wheel
2. Mark the wind dot below the grommet at the wind speed
3. Set the TAS under the grommet
4. Set the heading in the inner wheel
5. Read the Ground Speed the line the dot is on
6. Read the Drift under the dot
7. Read the Track under the Drift value onto the inner wheel

Question 2

Using the CRP 5, given the following information, what is the process of calculating the Wind Velocity

• Hdg
• Track
• TAS
• Ground Speed

Answer 2

1. Set the Hdg in the inner wheel
2. Set the TAS under the grommet
3. Read off the Drift
4. Mark the wind dot at the intersection of the Drift and Ground Speed
5. Rotate the inner wheel so the wind dot is cantered below the grommet
6. Read off the Wind Velocity

Question 3

Using the CRP 5, given the following information, what is the process of calculating the Heading and the Ground Speed?

• W/V
• Track
• TAS

Answer 3

1. Set the Wind direction in the inner wheel
2. Mark the wind dot under the grommet at the wind speed
3. Set the grommet over the TAS
4. Set the Tack on the inner wheel
5. Read the Drift from the wind dot
6. Adjust the heading according to the Drift, turning towards the dot
7. Repeat steps 5 and 6 until the dot no longer changes Drift
8. Read off the heading
9. Read off the ground speed

Question 4

Using the CRP 5, given the following information, what is the process of calculating the Wind Velocity?

• TAS
• Hdg 1
• Drift 1
• Hdg 2
• Drift 2

Answer 4

1. Set TAS under the grommet
2. Set Hdg 1 in the inner wheel
3. Mark a line along the Drift 1 angle
4. Set Hdg 2 in the inner wheel
5. Mark a line at Drift 2 angle where the other line crosses
6. Bring the cross down in line under the grommet
7. Read off heading
8. Read off Wind Speed

Question 5

Using the CRP 5 what is the process of calculating the Headwind and the Crosswind components?

Answer 5

1. Set the grommet at the top of the square grid section
2. Set the wind direction on the inner wheel
3. Mark the wind dot on the corresponding speed
4. Set the RW direction on the inner wheel
5. Read the head wind component (vertical distance)
6. Read the cross wind component (horizontal distance)
   (Direction to the dot for cross wind direction)

Question 6

Using the CRP 5 what is the process of calculating the maximum and minimum wind velocities?

Answer 6

1. Set the Runway direction in the inner wheel
2. Draw a horizontal line at the corresponding speed for the minimum headwind
3. Draw two vertical lines at the corresponding speeds for the maximum cross wind
4. Set the wind direction in the inner wheel
5. Read off the maximum and minimum values

Question 7

What are the equations for calculating the Headwind and the Crosswind components?

Answer 7

Headwind = Wind Speed x Cos(Difference Angle)

Crosswind = Wind Speed x Sin(Difference Angle)

Difference Angle is the angle between the RW and the wind direction

Question 8

What are the equations for calculating the Maximum and Minimum wind speeds?

Answer 8

Maximum Wind Speed = Min. HW / Cos(Difference Angle)

Minimum Wind Speed = Max. XW / Sin(Difference Angle)

Difference Angle is the angle between the RW and wind direction

Question 9

What is the Wind Correction Angle (WCA)?

Answer 9

• The Wind Correction Angle is the same as the Drift
• BUT it is applied to the Track to get the Heading
• Starboard (R) Drift is a ‘-ve’ WCA
• Port (L) is a ‘+ve’ WCA

Question 10

What part of the CRP 5 can be used to give a COAT given an IOAT and a TAS?

Answer 10

The Blue Temp. Rise section

Question 11

What is the formula for the ‘1 in 60’ rule?

Answer 11

Angle = (Opposite (small length) / Adjacent (long length)) x 60

Question 12

When flying off track, describe the ‘Parallel Track’ method

Answer 12

• Calculate the Track Error
• Apply the Track Error to the heading
• Effectively fly parallel to the desired track

Question 13

When flying off track, describe the ‘Regaining Track’ method

Answer 13

• Calculate the Track Error
• Apply the twice the Track error to the heading
• Re-apply the Track Error in the opposite direction when back on desired track

Question 14

When flying off track, describe the ‘Fly to Turning Point’ method

Answer 14

• Calculate Track Error
• Calculate Closing Angle
• Apply the sum of Track Error and Closing Angle
• Fly straight to the next turning point