diff --git a/Models/Instruments/MCDU/MCDU.nas b/Models/Instruments/MCDU/MCDU.nas
index 2aeb2e53..bb8116b1 100644
--- a/Models/Instruments/MCDU/MCDU.nas
+++ b/Models/Instruments/MCDU/MCDU.nas
@@ -1752,7 +1752,7 @@ var canvas_MCDU_base = {
 				me.fontRightS(default, default, default, default, default, default);
 				
 				me.fontSizeLeft(normal, normal, small, small, small, small);
-				me.fontSizeRight(normal, normal, small, small, small, small);
+				me.fontSizeRight(normal, normal, normal, small, small, small);
 				
 				me.colorLeft("grn", "grn", "wht", "wht", "wht", "wht");
 				me.colorLeftS("wht", "wht", "wht", "wht", "wht", "wht");
@@ -1796,12 +1796,19 @@ var canvas_MCDU_base = {
 			me["Simple_R5S"].setText("   GW/   CG");
 			me["Simple_R6S"].setText("EXTRA/TIME");
 			
-			if (blockSet.getValue() == 1 and zfwSet.getValue() == 1) {
-				setprop("/FMGC/internal/rte-rsv", num((block.getValue() - taxi_fuel.getValue() - min_dest_fob.getValue()) * (rte_percent.getValue() / 100) / (1 + rte_percent.getValue() / 100)));
-				setprop("/FMGC/internal/trip-fuel", num(block.getValue() - taxi_fuel.getValue() - min_dest_fob.getValue() - rte_rsv.getValue()));
-				setprop("/FMGC/internal/tow", num(block.getValue() + zfw.getValue() - taxi_fuel.getValue()));
-				setprop("/FMGC/internal/lw", num(tow.getValue() - trip_fuel.getValue()));
+			if (!getprop("/FMGC/internal/fuel-request-set") or !getprop("/FMGC/internal/block-confirmed") or getprop("/FMGC/internal/fuel-calculating")) {
+				me["Simple_L3"].setText(sprintf("---.-/%4.1f", rte_percent.getValue()));
+				me["Simple_L4"].setText("---.-/----");
+				me["Simple_L5"].setText("---.-/" ~ final_time.getValue());
+				me["Simple_L6"].setText("---.-");
 				
+				me["Simple_R4"].setText("---.-/FF+FQ");
+				me["Simple_R5"].setText("---.-/---.-");
+				me["Simple_R6"].setText("---.-/----");
+	
+				me.colorLeft("ack", "ack", "wht", "wht", "wht", "wht");
+				me.colorRight("ack", "ack", "ack", "wht", "wht", "wht");
+			} else {
 				me["Simple_L3"].setText(sprintf("%4.1f/", rte_rsv.getValue()) ~ sprintf("%4.1f", rte_percent.getValue()));
 				me["Simple_L4"].setText(sprintf("%4.1f/" ~ alt_time.getValue(), alt_fuel.getValue()));
 				me["Simple_L5"].setText(sprintf("%4.1f/" ~ final_time.getValue(), final_fuel.getValue()));
@@ -1816,15 +1823,6 @@ var canvas_MCDU_base = {
 				
 				me.colorLeft("ack", "ack", "blu", "blu", "blu", "blu");
 				me.colorRight("ack", "ack", "blu", "grn", "grn", "grn");
-			} else {
-				me["Simple_L3"].setText("---.-/---.-");
-				me["Simple_L4"].setText("---.-/----");
-				me["Simple_L5"].setText("---.-/0030");
-				me["Simple_L6"].setText("---.-");
-
-				me["Simple_R4"].setText("---.-/FF+FQ");
-				me["Simple_R5"].setText("---.-/---.-");
-				me["Simple_R6"].setText("---.-/----");
 			}
 			
 			me["Simple_R3S"].setText("ZFWCG/ZFW");
@@ -1849,6 +1847,30 @@ var canvas_MCDU_base = {
 				me["Simple_R3"].hide(); 
 			}
 			
+			if (rte_set.getValue() == 1) {
+				me["Simple_L3"].setFontSize(normal);
+			} else {
+				me["Simple_L3"].setFontSize(small);
+			}
+			
+			if (alt_fuel_set.getValue() == 1) {
+				me["Simple_L4"].setFontSize(normal);
+			} else {
+				me["Simple_L4"].setFontSize(small);
+			}
+			
+			if (final_fuel_set.getValue() == 1 or final_time_set.getValue() == 1) {
+				me["Simple_L5"].setFontSize(normal);
+			} else {
+				me["Simple_L5"].setFontSize(small);
+			}
+			
+			if (min_dest_fob_set.getValue() == 1) {
+				me["Simple_L6"].setFontSize(normal);
+			} else {
+				me["Simple_L6"].setFontSize(small);
+			}
+			
 		} else if (page == "PROGTO" or page == "PROGCLB" or page == "PROGCRZ" or page == "PROGDES") {
 			if (getprop("/FMGC/status/phase") == 0 or getprop("/FMGC/status/phase") == 1) {
 				setprop("/MCDU[" ~ i ~ "]/page", "PROGTO");
diff --git a/Nasal/MCDU/FUELPRED.nas b/Nasal/MCDU/FUELPRED.nas
index 79108e44..78442676 100644
--- a/Nasal/MCDU/FUELPRED.nas
+++ b/Nasal/MCDU/FUELPRED.nas
@@ -29,74 +29,75 @@ var extra_time = props.globals.getNode("FMGC/internal/extra-time", 1);
 
 var fuelPredInput = func(key, i) {
 	var scratchpad = getprop("MCDU[" ~ i ~ "]/scratchpad");
-	if (key == "L3" and blockSet.getValue() == 1 and zfwSet.getValue() == 1) {
+	if (key == "L3" and getprop("/FMGC/internal/block-confirmed") and !getprop("/FMGC/internal/fuel-calculating")) {
 		if (scratchpad == "CLR") {
-			setprop("/FMGC/internal/rte-rsv", 0.05 * num(trip_fuel.getValue()));
+			setprop("/FMGC/internal/rte-rsv", 0.05 * num(getprop("/FMGC/internal/trip-fuel")));
 			setprop("/FMGC/internal/rte-percent", 5.0);
-			setprop("MCDU[" ~ i ~ "]/scratchpad-msg", 0);
-			setprop("MCDU[" ~ i ~ "]/scratchpad", "");
-			fmgc.updateFuel();
+			setprop("/FMGC/internal/fuel-calculating", 1);
+			setprop("/MCDU[" ~ i ~ "]/scratchpad-msg", 0);
+			setprop("/MCDU[" ~ i ~ "]/scratchpad", "");
 		} else if (getprop("/FMGC/internal/trip-fuel") != 0) {
 			var tf = num(scratchpad);
 			var tfs = size(scratchpad);
 			if (tfs >= 2 and tfs <= 5 and find("/", scratchpad) == 0) {
 				var perc = num(split("/", scratchpad)[1]);
 				if (perc != nil and perc >= 0.0 and perc <= 15.0) {
-					setprop("/FMGC/internal/rte-rsv", num(perc) / 100 * num(trip_fuel.getValue()));
+					setprop("/FMGC/internal/rte-rsv", num(perc) / 100 * num(getprop("/FMGC/internal/trip-fuel")));
 					setprop("/FMGC/internal/rte-percent", perc);
-					setprop("MCDU[" ~ i ~ "]/scratchpad", "");
+					setprop("/FMGC/internal/fuel-calculating", 1);
+					setprop("/MCDU[" ~ i ~ "]/scratchpad", "");
 				}
-			} else if (tfs >= 1 and tfs <= 4 and tf != nil and tf >= 0 and tf <= 21.7 and tf / num(trip_fuel.getValue()) <= 0.15) {
+			} else if (tfs >= 1 and tfs <= 4 and tf != nil and tf >= 0 and tf <= 21.7 and tf / num(getprop("/FMGC/internal/trip-fuel")) <= 0.15) {
 					setprop("/FMGC/internal/rte-rsv", scratchpad);
-					setprop("/FMGC/internal/rte-percent", scratchpad / num(trip_fuel.getValue()) * 100);
-					setprop("MCDU[" ~ i ~ "]/scratchpad", "");
+					setprop("/FMGC/internal/rte-percent", scratchpad / num(getprop("/FMGC/internal/trip-fuel")) * 100);
+					setprop("/FMGC/internal/fuel-calculating", 1);
+					setprop("/MCDU[" ~ i ~ "]/scratchpad", "");
 			} else {
 				notAllowed(i);
 			}
 		} else {
 			notAllowed(i);
 		}
-	} else if (key == "L4" and blockSet.getValue() == 1 and zfwSet.getValue() == 1) {
+	} else if (key == "L4" and getprop("/FMGC/internal/block-confirmed") and !getprop("/FMGC/internal/fuel-calculating")) {
 		if (scratchpad == "CLR") {
 			setprop("/FMGC/internal/alt-fuel", 0.0);
 			setprop("/FMGC/internal/alt-time", "0000");
-			setprop("MCDU[" ~ i ~ "]/scratchpad-msg", 0);
-			setprop("MCDU[" ~ i ~ "]/scratchpad", "");
-			fmgc.updateFuel();
+			setprop("/FMGC/internal/alt-fuel-set", 0);
+			setprop("/FMGC/internal/fuel-calculating", 1);
+			setprop("/MCDU[" ~ i ~ "]/scratchpad-msg", 0);
+			setprop("/MCDU[" ~ i ~ "]/scratchpad", "");
 		} else if (find(".", scratchpad) != -1) {
 			var tf = num(scratchpad);
 			var tfs = size(scratchpad);
-			if (tfs >= 3 and tfs <= 4 and tf != nil and tf >= 0 and tf <= 10.0 and tf < trip_fuel.getValue() + alt_fuel.getValue()) {
+			if (tfs >= 3 and tfs <= 4 and tf != nil and tf >= 0 and tf <= 10.0) {
 				setprop("/FMGC/internal/alt-fuel", tf);
-				setprop("MCDU[" ~ i ~ "]/scratchpad", "");
-				fmgc.updateFuel();
+				setprop("/FMGC/internal/alt-time", "0000");
+				setprop("/FMGC/internal/alt-fuel-set", 1);
+				setprop("/FMGC/internal/fuel-calculating", 1);
+				setprop("/MCDU[" ~ i ~ "]/scratchpad", "");
 			} else {
 				notAllowed(i);
 			}
 		} else {
-			var tf = num(scratchpad);
-			var tfs = size(scratchpad);
-			if (tfs == 4 and tf != nil and ((tf >= 0 and tf <= 59) or (tf >= 100 and tf <= 130))) {
-				setprop("/FMGC/internal/alt-time", scratchpad);
-				setprop("MCDU[" ~ i ~ "]/scratchpad", "");
-			} else {
-				notAllowed(i);
-			} 
+			notAllowed(i);
 		}
-	} else if (key == "L5" and blockSet.getValue() == 1 and zfwSet.getValue() == 1) {
+	} else if (key == "L5" and getprop("/FMGC/internal/block-confirmed") and !getprop("/FMGC/internal/fuel-calculating")) {
 		if (scratchpad == "CLR") {
 			setprop("/FMGC/internal/final-fuel", 0.0);
 			setprop("/FMGC/internal/final-time", "0030");
-			setprop("MCDU[" ~ i ~ "]/scratchpad-msg", 0);
-			setprop("MCDU[" ~ i ~ "]/scratchpad", "");
-			fmgc.updateFuel();
+			setprop("/FMGC/internal/final-fuel-set", 0);
+			setprop("/FMGC/internal/final-time-set", 0);
+			setprop("/FMGC/internal/fuel-calculating", 1);
+			setprop("/MCDU[" ~ i ~ "]/scratchpad-msg", 0);
+			setprop("/MCDU[" ~ i ~ "]/scratchpad", "");
 		} else if (find(".", scratchpad) != -1) {
 			var tf = num(scratchpad);
 			var tfs = size(scratchpad);
-			if (tfs >= 3 and tfs <= 4 and tf != nil and tf >= 0 and tf <= 10.0 and tf < trip_fuel.getValue() + final_fuel.getValue()) {
+			if (tfs >= 3 and tfs <= 4 and tf != nil and tf >= 0 and tf <= 10.0) {
 				setprop("/FMGC/internal/final-fuel", tf);
-				setprop("MCDU[" ~ i ~ "]/scratchpad", "");
-				fmgc.updateFuel();
+				setprop("/FMGC/internal/final-fuel-set", 1);
+				setprop("/FMGC/internal/fuel-calculating", 1);
+				setprop("/MCDU[" ~ i ~ "]/scratchpad", "");
 			} else {
 				notAllowed(i);
 			}
@@ -105,12 +106,38 @@ var fuelPredInput = func(key, i) {
 			var tfs = size(scratchpad);
 			if (tfs == 4 and tf != nil and ((tf >= 0 and tf <= 59) or (tf >= 100 and tf <= 130))) {
 				setprop("/FMGC/internal/final-time", scratchpad);
-				setprop("MCDU[" ~ i ~ "]/scratchpad", "");
+				setprop("/FMGC/internal/final-time-set", 1);
+				setprop("/FMGC/internal/fuel-calculating", 1);
+				setprop("/MCDU[" ~ i ~ "]/scratchpad", "");
 			} else {
 				notAllowed(i);
 			} 
 		}
-	} else if (key == "R3") {
+	} else if (key == "L6" and getprop("/FMGC/internal/block-confirmed") and !getprop("/FMGC/internal/fuel-calculating")) {
+		if (scratchpad == "CLR") {
+			setprop("/FMGC/internal/min-dest-fob", 0);
+			setprop("/FMGC/internal/min-dest-fob-set", 0);
+			setprop("/FMGC/internal/fuel-calculating", 1);
+			setprop("/MCDU[" ~ i ~ "]/scratchpad-msg", 0);
+			setprop("/MCDU[" ~ i ~ "]/scratchpad", "");
+		} else if (find(".", scratchpad) != -1) {
+			var tf = num(scratchpad);
+			var tfs = size(scratchpad);
+			if (tfs >= 3 and tfs <= 5 and tf != nil and tf >= 0 and tf <= 80.0) {
+				setprop("/FMGC/internal/min-dest-fob", tf);
+				setprop("/FMGC/internal/min-dest-fob-set", 1);
+				setprop("/FMGC/internal/fuel-calculating", 1);
+				setprop("/MCDU[" ~ i ~ "]/scratchpad", "");
+				if (num(getprop("/FMGC/internal/min-dest-fob")) < num(getprop("/FMGC/internal/final-fuel") + getprop("/FMGC/internal/alt-fuel"))) {
+					genericMessage(i, "CHECK MIN DEST FOB", "wht");
+				}
+			} else {
+				notAllowed(i);
+			}
+		} else {
+			notAllowed(i);
+		}
+	} else if (key == "R3" and !getprop("/FMGC/internal/fuel-calculating")) {
 		if (scratchpad == "CLR") {
 			notAllowed(i);
 		} else {
@@ -130,6 +157,10 @@ var fuelPredInput = func(key, i) {
 					if (getprop("/FMGC/internal/block-set") != 1) {
 						setprop("/FMGC/internal/block", num(getprop("consumables/fuel/total-fuel-lbs") / 1000));
 						setprop("/FMGC/internal/block-set", 1);
+						setprop("/FMGC/internal/fuel-request-set", 1);
+						setprop("/FMGC/internal/fuel-calculating", 1);
+						setprop("/FMGC/internal/block-calculating", 0);
+						setprop("/FMGC/internal/block-confirmed", 1);
 					}
 				}
 				if (zfw != nil and zfws >= 1 and zfws <= 5 and zfw > 0 and zfw <= 999.9) {
@@ -138,6 +169,13 @@ var fuelPredInput = func(key, i) {
 					if (getprop("/FMGC/internal/block-set") != 1) {
 						setprop("/FMGC/internal/block", num(getprop("consumables/fuel/total-fuel-lbs") / 1000));
 						setprop("/FMGC/internal/block-set", 1);
+						setprop("/FMGC/internal/fuel-request-set", 1);
+						setprop("/FMGC/internal/fuel-calculating", 1);
+						setprop("/FMGC/internal/block-calculating", 0);
+						setprop("/FMGC/internal/block-confirmed", 1);
+					}
+					if (getprop("/FMGC/internal/block-confirmed")) {
+						setprop("/FMGC/internal/fuel-calculating", 1);
 					}
 				}
 				if ((zfwcg != nil and zfwcgs >= 1 and zfwcgs <= 5 and zfwcg > 0 and zfwcg <= 99.9) or (zfw != nil and zfws >= 1 and zfws <= 5 and zfw > 0 and zfw <= 999.9)) {
@@ -153,6 +191,10 @@ var fuelPredInput = func(key, i) {
 					if (getprop("/FMGC/internal/block-set") != 1) {
 						setprop("/FMGC/internal/block", num(getprop("consumables/fuel/total-fuel-lbs") / 1000));
 						setprop("/FMGC/internal/block-set", 1);
+						setprop("/FMGC/internal/fuel-request-set", 1);
+						setprop("/FMGC/internal/fuel-calculating", 1);
+						setprop("/FMGC/internal/block-calculating", 0);
+						setprop("/FMGC/internal/block-confirmed", 1);
 					}
 					setprop("MCDU[" ~ i ~ "]/scratchpad", "");
 				} else {
diff --git a/Nasal/MCDU/MCDU.nas b/Nasal/MCDU/MCDU.nas
index e7748e55..6cfe9937 100644
--- a/Nasal/MCDU/MCDU.nas
+++ b/Nasal/MCDU/MCDU.nas
@@ -399,6 +399,8 @@ var lskbutton = func(btn, i) {
 			initInputA("L6",i);
 		} else if (getprop("MCDU[" ~ i ~ "]/page") == "INITB") {
 			initInputB("L6",i);
+		} else if (getprop("MCDU[" ~ i ~ "]/page") == "FUELPRED") {
+			fuelPredInput("L6",i);
 		} else if (getprop("MCDU[" ~ i ~ "]/page") == "IRSINIT") {
 			initInputIRS("L6",i);
 		} else if (getprop("MCDU[" ~ i ~ "]/page") == "ROUTESELECTION") {