Intelligence officials and relatives of military personnel were killed in the 1994 Royal Air Force helicopter crash and took the first step towards legal action against the Ministry of Defense (MOD) on the fortress of Gentle.

On June 2, 1994, after crashing in mist in southwestern Scotland, there were 29 people - including MI5, Royal Ulster Police and Army officers, as well as special forces crews of helicopters, and special forces crews of helicopters.

Now, 31 years ago, BOONO was issued for lawyers who lost their loved ones, and the Ministry of Defense has been released through the "Letter before the Operation" seen by the Guardian.

The letter formally informed the intention of the Chinook Judicial Movement campaign for judicial review to apply for a judicial review without public inquiries about the crash and invoked Section 2 of the Human Rights Act, which protects the right to life. It urged Secretary of State John Healey to start the investigation "without further delay" and allowed him to respond for 14 days.

Last week, the Guardian reported the needs of the families in an open letter to the government to release all archive documents that have been locked in 2094 by the Defense Department. Their attorneys believe that the investigation led by a public judge will have full access to material that was not considered by previous investigations.

"The government has a legal obligation to answer these families. Thirty-one years, the reason for not operating is the reason for confidentiality, and the only way is through a judge-led investigation where the judge can review what is called "secret material" and answer what is called "secret" material and answer the remaining questions."

Stephens said the families and their legal counsel had seen "enough evidence" to convince them that "the plane should never be taken off."

Lord Philip’s latest review in 2011 raised safety issues, but concluded that the cause of the crash was impossible to know, while also causing the helicopter’s late pilot, FLT LTS LTS Richard Cook and Jonathan Tapper to be founded by RAF 17 years ago in the “Gross Entligence”.

Maj Gary Sparks, father of Esme Sparks of County Durham, was killed in the crash. : "We don't want legal action against the government, but we do want and need answers. In our opinion, public inquiries are key."

When Andy Tobias was eight years old, his father, Lieutenant Colonel John Tobias, 41, was killed: "It's obvious to me that there is a total lack of care obligations for those passengers because they ride in Chinooks who are not suitable for flight.

“In fact, governments need to express their candid obligations and be really open and transparent about what’s in these documents and give us the opportunity to really understand anything in it that can give us more answers about what’s going on.”

On Sunday, the family attended a private commemoration at Staffordshire National Memorial Botanical Garden. A MOD spokesman previously said describing the crash as a “tragic accident”, after saying: “Our thoughts and compassion remain family, friends and colleagues of all the dead.”