Explanation:
Enter at the left side with 30C to PA
sea level.
Move right to mass reference line
paralleling the graph lines to the mass 2940 lbs.
Move right to the wind reference line
then up and left to 10kt TW.
Move right to obstacle height
reference line then up and left to read 1900ft.
It is believed that the exam answer
to this question is incorrectly given as 1300ft.
To achieve this they would have
incorrectly used 10 kt HW. If seen in the exams appeal this through your
school.