I am no historian but I guess it would certainly be before India gained Independence and/or the partition of the country and the ensuing religious nastiness.
Just found this with Google which seems to suggest that the RAF were gone before independence.
Chaklala was already functioning as an RIAF station well before independence and a Para Training School (PTS) was located there. On 12 January 47, a medical training centre under the command of Squadron Leader Haque was also established at Chaklala. On 14 August 47, the PTS had the honour of presenting the guard at the lowering of the RIAF ensign for the last time when RPAF Station Chaklala was born