May be it's not a daily RSA ( as HWH JS is not running on Sunday whereas RNC JS is daily). The schedule is probably like this ( Just a guess):
Rake 1 : Sun-Sat as RNC JS-> Sun ( Full maintenance) -> Mon-Sat as HWH JS -> Sun-Sat as RNC JS->Sun ( Full maintenance).
Rake 2 will have a similar schedule. This way, every alternate sunday, one rake will go for a complete maintenance and whichever rake runs as HWH JS for the week, will run as RNC JS for the next...
more... week and then go for a full maintenance.