Vilas is correct, as an added note for those using Thales FMGC's, the below is from Thales New Pilots Guide Release 1A:
"Notes - At 700FT RA : Approach Data are locked, i.e. ILS/MLS/GLS freq & course are frozen in the receiver, when in APPR mode (LOC & G/S armed or engaged) with at least one AP/FD engaged. Any entry via MCDU or RMP does not affect the receiver."
There was an accident regarding this where the crew hard tuned an ILS freq for use during a departure and never cleared it (our SOP is to clear the RAD/NAV page of pilot tuned NAVAIDS at 18k) On approach they couldn't figure out why they couldn't get the FMGC loaded ILS to work. The FMGC will not overwrite pilot loaded NAV aids. (I can't find the report of that incident, if anybody recalls it, I would appreciate a link - thanks)
Last edited by CaptainMongo; 30th Jun 2016 at 21:00.