Step #1
Draw a rectangle as shown.
Step #2
Draw air ambulance base & fan.
Step #3
Draw rounded corner square.
Step #4
Draw shape as shown.
Step #5
Draw the tail.
Step #6
Draw cap like shape.
Step #7
Enhance drawing as shown.
Step #8
Draw line as shown.
Step #9
Draw landing skids.
Step #10
Draw main rotor blade.
Step #11
Draw windows and other parts.
Step #12
Enhance the drawing as shown.
Step #13
Make necessary improvements to finish.