C learance, confirm FMS RTE page is showing the new arrival you've been cleared for
R adios, confirm on NAV RAD page that tuned ILS or VORs agree with chart
A ltitudes, a quick re-set/re-brief of FAP/FAF, minima and MAP altitudes
P erformance, consider if new flap setting/autobrake setting required for new runway
And let's face it, as a mnemonic aide it comes quite naturally for a last-minute runway change...
