I am sure the AIR FORCE have applied MSG LOGIC to the Senrty Fleet and will apply it to the Rivet Joint aircraft.
Any logic applied to RAF aircraft will be carried out by a third party. The RAF no longer has the capability to apply MSG3 (RCM in RAF speak) to any aircraft. RCM at RAF Wyton was wound up in October 2011. I believe that this was a big mistake by the MoD bean counters, sanctioned by the RAF, to save a few pounds.
Shortly after the Sentry entered service the RAF handed over responsibility for the Sentry RCM to the Sentry PT who, I believe, passed it on to Grummon.
Aaron.