Intelligence writer Stephen Dorril claims Rickard was the Director and Co-ordinator of Intelligence (Northern Ireland) at the time of his death. Christopher Andrew's official history of MI5 appears to imply that John Deverell was DCI at the time of the crash, although this could be an ambiguous reference to an earlier post. Other reports suggest that Deverell was a Deputy Director General of MI5, which would appear to support Dorril's account.
- The 29 who died, The Guardian, 6 February 2002.
- Stephen Dorril, Lobster95, Issue 29, p.14.
- Christopher Andrew, The Defence of the Realm: The Authorized History of MI5, Allen Lane, 2009, p.785.
- Sally Weale and Owen Boycott, CHINOOK DISASTER: COUNTING THE COST OF THE SENIOR FIGURES IN BATTLE AGAINST TERRORISM, Guardian, 4 June 1994.