SANJIV KHANNA, J.

We have heard Mr. Dharambir, a retired Head Master, who appears in person in this writ petition which impugns order dated 13th February, 2015 passed by the Principal Bench of the Central Administrative Tribunal in OA Nos. 5/2011 and 3723/2011.

2. The petitioner was appointed as an Assistant Teacher in Municipal Corporation of Delhi on 18th September, 1972 in the pay scale of Rs.135-320. The petitioner was granted senior scale after completion of 12 years’ of service in the scale of Rs.1400-2600, with effect from 1st January, 1986 which was revised to Rs.5500-9000 with effect from 1st January, 1996 on implementation of the Fifth Pay Commission recommendations. The petitioner was promoted as Head Master on 31st January, 2003 in the pay-scale of Rs.5500-9000, as applicable at the time of promotion.

3. The Municipal Corporation of Delhi vide circular dated 1st September, 2005 had implemented the Assured Career Progression Scheme with retrospective effect from 9th August, 1999. The petitioner had already got the first financial upgradation when he was granted senior scale with effect from 1st January, 1986. The petitioner claimed entitlement to the second financ