A new report into the RAF helicopter crash on the Mull of Kintyre 14 years ago will be presented today to British Defence Secretary Des Browne.
Campaigners from the Mull of Kintyre Group believe they have uncovered new evidence challenging the findings of an RAF inquiry that blamed "gross negligence" by the pilots for the Chinook crash.
All 29 people on board the helicopter - including 25 Northern Ireland security staff - were killed when it crashed into the Scottish island in bad weather on June 2nd, 1994.
Labour peer Lord O'Neill of Clackmannan, who will present the report to Mr Browne, said they believed it included evidence that was not available to the Board of Inquiry.
Campaigners, including the parents of the pilots - flight lieuts Jonathan Tapper and Rick Cook - have long argued that problems with the Chinook's engine control software could have been a factor in the crash.