http://isro.org/pressrelease/scripts/pressreleasein.aspx?Jul21_2011"
GSAT-12 Communication Satellite placed in Geosynchronous OrbitThe GSAT-12 Communication Satellite, launched onboard Polar Satellite Launch Vehicle (PSLV-C17), has been successfully placed in Geosynchronous Orbit with a perigee of 35,684 km, apogee of 35,715 km and an orbital inclination of 0.17 degree with respect to the equatorial plane.
It may be recalled that on July 15, 2011, PSLV-C17 had injected GSAT-12 into an elliptical transfer orbit of 281 km perigee and 21,027 km apogee, and orbital inclination of 17.9 degree. The critical manoeuvres to raise GSAT-12 Satellite into Geosynchronous Orbit were performed by firing the 440 Newton Liquid Apogee Motor of GSAT-12 Satellite for
about 80 minutes in five spells during July 16-20, 2011.
-----------------------------------------------------------
------------------------------------------------------------
-----------------------------------------------------------
"
Why was it necessary to fire the LAM so many times(5 times), would 1 or 2 long firings over heat the LAM? Or is there some other reason for so many firings?
Is it not risky to restart the LAM so many times? ( just in case the LAM fails to restart)