Normally, LTA fall within the meaning of 'Salary'. These benefits are taxable under the head 'Salaries' subject to exemption u/s 10(5). Accordingly, it would not be liable to FBT.
However, if the LTA is not included in 'Salary' then it will be taxed under FBT in clause (F) of sub section (2) of section 115WB & accordingly be liable to FBT.