Pan Am Flight 103 Conspiracy Theories - Radio Detonation

Radio Detonation

According to conspiracy theorist and self-styled private investigator Joe Vialls, who died in July 2005, the bomb on PA 103 was triggered not by a simple timing device, but by a more complex technique of radio detonation. The Vialls theory relies on the assumption that the aircraft was handed over to a different air traffic control center when it passed over the Dean Cross navigational beacon, requiring it to communicate on one of the 22 frequencies used by Shanwick Oceanic Control. Maid of the Seas would then have been flying at about 500 mph between Dean Cross beacon and where it crashed on the town of Lockerbie, an overall distance of 30 miles (48 km) representing a point-to-point flight time of barely four minutes. As PA 103 passed overhead the Dean Cross beacon, a light would have flashed on in the cockpit alerting the pilots to change frequency in order to obtain permission for the Atlantic crossing from Shanwick Oceanic Control at Prestwick, Scotland. Using standard reaction times, according to Vialls, it would have taken between three and five minutes for the crew to be ready to communicate on the new frequency. In its PA 103 report, the Air Accident Investigation Branch (AAIB) stated:

"At 18.58 hrs the aircraft established two-way radio contact with Shanwick Oceanic Control on frequency 123.95 MHz. At 19.02:44 hrs the clearance delivery officer at Shanwick transmitted to the aircraft its oceanic route clearance. The aircraft did not acknowledge this message and made no subsequent transmission." The AAIB report continued: "The cockpit voice recorder tape was listened to for its full duration and there was no indication of anything abnormal with the aircraft, or unusual crew behaviour. The tape record ended, at 19.02:50 hrs ± 1 second, with a sudden loud sound on the cockpit area microphone channel followed almost immediately by the cessation of recording whilst the crew were copying their transatlantic clearance from Shanwick ATC."

The Vialls radio detonation theory puts forward two different triggering mechanisms:

• A remotely controlled bomb in the aircraft that was triggered by a radio signal sent from outside the aircraft
• A sophisticated device on board the aircraft that monitored multiple variables including time and the use of specific air-traffic control frequencies by the aircraft.

Vialls cited the following example of how the Israelis used the technique of radio detonation: In the late 1980s, Israeli intelligence managed to obtain the cellular phone of Yahya Ayyash by fooling him into believing that his phone had a fault; the phone was booby-trapped with explosives when he brought it in for repairs, then subsequently detonated by a signal sent over the Israeli-controlled mobile phone network when he answered it.

According to Vialls, the inside of a Boeing 747 is a Faraday cage, which would ensure that secondary emissions—from the captain's radio message to Shanwick Oceanic Control, for example—would be sufficient to activate the radio trigger of the bomb. Thus, the PA 103 bomb could have been triggered by an internally generated command radio signal transmitted to or received from Shanwick. However, Vialls believed that the extent of the damage caused to the aircraft meant that the bomb was probably positioned close to the fuselage, rather than—as the prosecution maintained at the trial—being wrapped in clothing, packed in a suitcase and loaded inside a baggage container.

Vialls himself blamed the Israeli Mossad for the PA 103 bombing. This fitted with the general theme of Vialls's investigations: he blamed Israel and Mossad for a variety of international disasters and events, including the 2004 Asian Tsunami and the death of Diana, Princess of Wales.