Iran Air Flight 655 - Potential Factors

Potential Factors

  • The ship's crew did not efficiently consult commercial airliner schedules, due to confusion over which time zone the schedules referred to. The schedules flight times used Bandar Abbas airport time while the Vincennes was on Bahrain time. The airliner's departure was 27 minutes later than scheduled. "The CIC was also very dark, and the few lights that it did have flickered every time the Vincennes fired at the speedboats. This was of special concern to Petty Officer Andrew Anderson, who first picked up Flight 655 on radar and thought that it might be a commercial aircraft. As he was searching in the Navy's listing of commercial flights, he apparently missed Flight 655 because it was so dark."
  • An Iranian P-3 was in the area some time before the attack, thought to be flying a "classic targeting profile", and in some reports providing an explanation why no radar signals were detected from Iran Air Flight 655. Other reports state that the Airbus was immediately detected after takeoff by Vincennes's AN/SPY-1 radar at a range of 47 miles (76 km).
  • The crew of the Vincennes Combat Information Center (CIC) confusingly reported the plane as ascending and descending at the same time (there were two "camps"). This seems to have happened because the Airbus' original Link 11 track, number 4474, had been replaced by the Sides track, number 4131, when the computer recognised them as one and the same. Shortly thereafter, track 4474 was re-assigned by the system to an American A-6, several hundred miles away, which was following a descending course at the time. Apparently not all the crew in the CIC realized the track number had been switched on them.
  • The psychology and mindset after engaging in a battle with Iranian gunboats. There are claims that Vincennes was engaged in an operation using a decoy cargo ship to lure Iranian gunboats to a fight. However, those claims are denied by Fogarty in "Hearing Before The Investigation Subcommittee and The Defense Policy Panel of The Committee on Armed Services, House of Representatives, One Hundred Second Congress, Second Session, 21 July 1992". Also, the initial claims of Vincennes being called for help by a cargo ship attacked by Iranian gunboats have been ruled out. That leads to claims that the Iranian gunboats were provoked by helicopters inside Iranian waters and not the other way around. This might have contributed to the mistakes made. The actual reasons for the Vincennes' engagement with gunboats is not so clear to this date.

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