PPOS hold on B-738-LNAV,VNAV..

[boeingdream787]

Just something that happened to me today.Say you get into a PPOS hold,in straight and level flight at say 50 nm from destination.Both LNAV and VNAV are the operational modes.Say you are descended to an interim level from your cruising level by ATC and asked to hold Present Position(PPOS) at say level 250 and your cruising level was 350.My question is that once in the hold,without ANY pilot input into the FMC's what would the FMC/AP do and why.In this instance,say you have a reserve fuel of 2.0 T and you had 2.5 T when you started the hold.No EAT fed into the box(would that make a difference??).Would REALLY help if i could get something from ALL the learned ones out there.Many many thanks in advance.BTW....737-800.[/COLOR]......