PENTAGON BUILDING PERFORMANCE REPORT
3.7 SUMMARY OF THE IMPACT
At that time the aircraft had rolled slightly to the left, its right wing elevated. After the plane had traveled approximately another 75 ft,
the left engine struck the ground at nearly the same instant that the nose of the aircraft struck the west wall of the Pentagon (figure 3.15)

Killtown: Where?
Photo Source:
DoD
The size of a Boeing's left engine.