In a letter to Principal Secretary Home, Amitabh said, "With passing of 140 days since my suspension on 13 July and there being no review of the suspension during this period, my suspension has already legally lapsed and I shall be reinstated immediately".
Thakur noted that he was suspended under Rule 3 of the All India Services Discipline and Appeal Rules but as per the sub-rule 8, every suspension order must be reviewed within 90 days of suspension by a Review Committee headed by Chief Secretary and if such review is not done, the suspension order stands automatically revoked.
"If I did not get an appropriate order within a week, I will move to Court for judicial relief," he added.
Thakur was suspended after he lodged an FIR against Samajwadi Party supremo Mulayam SIngh Yadav, who allegedly threatened him over phone.