Figure 2.—Diagram of impact of OPSE-7 and No. 74.
National Transportation Safety Board (NTSB)
<a class="external free" href="https://en.wikisource.org/wiki/Page:NTSB_RAR-81-4.pdf/8">https://en.wikisource.org/wiki/Page:NTSB_RAR-81-4.pdf/8</a>