Land ASAP - "The clock is running and the life of those on board is in immediate danger by staying in the air. Put the aircraft onto the ground (or water, if necessary) as soon as you can find a place where you expect everyone can survive the landing."
Land ANSA - "While the aircraft is not in immediate danger, sufficient failures have occurred so that a further failure will place the passengers in immediate danger. As such, the aircraft cannot continue to destination with a sufficient guarantee of safety. Land at the nearest airport, where you fully expect you can land with no further risk to aircraft or passengers. This means take full account of weather, approach aids, terrain, runway size, ATC and RFFS etc., but no account of engineering or company support - these considerations are only of importance after the passenger's safety is assured (i.e. on the ground)."