There was only one distress call from the Aer Lingus aircraft involved in the Tuskar Rock accident, which was heard and recorded by the London Air Traffic Control Centre. At the time of the accident, the aircraft was transmitting on the radio frequency of this centre.
The distress call, as reported in the report of the investigation into this accident, was very short, of approximately 2.5 seconds duration, and of poor quality. This recording was analysed at the time of the original investigation and was again re-examined in recent years. This recent examination failed to reveal any further useful information.
The Air Accident Investigation Unit of my Department is not aware of any new techniques that could glean further information from the recording. However, if anybody can suggest a methodology of testing that may detect further useful data from this short recording, the unit is fully prepared to have such tests conducted. Such tests would have to be conducted under the supervision of the Air Accident Investigation Unit. It would not be proper for the unit to surrender possession or control of the tape to another party. Under section 5.12 of Annex 13 to the Convention of International Civil Aviation, states are required to exercise control over the custody of such tape recordings.