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The memorandum in question, coded mfr04016821, asserts critical observations from the investigation carried out by the 9/11 Commission. It clarifies that the ELTs on the Boeing 767s used in the attacks cannot be manually triggered by the pilots. Rather, they are designed to activate automatically upon impact.
The specifics are revealing: American Airlines Flight 11's ELT signal activated two minutes before the aircraft crashed at 8:46 AM, while United Airlines Flight 175's ELT transmitted its signal four minutes ahead of its impact. Such discrepancies directly contradict earlier assumptions that the pilots might have activated the transmitters manually.