Bangalore: Former ISRO chief G Madhavan Nair has written to Prime Minister Manmohan Singh for quashing an official order barring him and three fellow space scientists from holding government posts and to also probe this issue.

"I have represented to the Prime Minister and asked him to quash the order as well as conduct an inquiry into the matter," Nair said on Monday, adding the Government should restore his honour.

"I am not interested in any government favours. What I am interested is restoring the honour of myself and my colleagues," said the ex-Chairman of the Indian Space Research Organisation(ISRO).

In the letter to Singh, Nair wanted an inquiry into Government action blacklisting the four scientists in connection with the Antrix-Devas deal in which the private firm was allotted scarce S band spectrum by ISRO allegedly violating rules when he was the space agency's chairman.

The architect of the maiden unmanned Moon mission Chandrayan-I separately said there should be a "proper procedure" in proceeding with all these matters before an official order is issued.

On the statement of Minister of State in the Prime Minister's Office V Narayanasamy that the government is ready to hear their views, Nair said, "If it is a real move from Government side it is good.”

Nair demanded an apology from those responsible for taking punitive action against the four space scientists.

"Certainly, they owe an apology not to me but to the whole country. Somebody has taken law into their hands and they have to apologise before the country", said Nair when asked if those who issued the order should tender an apology.

Nair said the earlier order was issued as per the direction of the government and "competent authority has taken a decision."

"Now, if the government is serious about it, it has to direct the so-called competent authority to do the needful (revoke the order)", he said.

He also said the government should approach him and the three scientists directly rather than seeking their views through media, asserting that truth has to be established as it's a question of their honour.