diff --git a/Nasal/MCDU1/INITB.nas b/Nasal/MCDU1/INITB.nas
index 06f6fd39..29de161a 100644
--- a/Nasal/MCDU1/INITB.nas
+++ b/Nasal/MCDU1/INITB.nas
@@ -8,12 +8,11 @@ var initInputB = func(key) {
 	var scratchpad = getprop("/MCDU[0]/scratchpad");
 	if (key == "R1") {
 		if (scratchpad == "CLR") {
-			setprop("/FMGC/internal/zfw", 0);
-			setprop("/FMGC/internal/zfwcg", 55.1); # 25KG default
-			setprop("/FMGC/internal/zfw-set", 0);
-			setprop("/FMGC/internal/zfwcg-set", 0);
-			setprop("/MCDU[0]/scratchpad-msg", "0");
-			setprop("/MCDU[0]/scratchpad", "");
+			if (getprop("/MCDU[0]/scratchpad") != "NOT ALLOWED") {
+				setprop("/MCDU[0]/last-scratchpad", getprop("/MCDU[0]/scratchpad"));
+			}
+			setprop("/MCDU[0]/scratchpad-msg", "1");
+			setprop("/MCDU[0]/scratchpad", "NOT ALLOWED");
 		} else {
 			var tfs = size(scratchpad);
 			if (tfs == 0) {
diff --git a/Nasal/MCDU2/INITB.nas b/Nasal/MCDU2/INITB.nas
index 0b0558a3..cb587f8d 100644
--- a/Nasal/MCDU2/INITB.nas
+++ b/Nasal/MCDU2/INITB.nas
@@ -8,12 +8,11 @@ var initInputB = func(key) {
 	var scratchpad = getprop("/MCDU[1]/scratchpad");
 	if (key == "R1") {
 		if (scratchpad == "CLR") {
-			setprop("/FMGC/internal/zfw", 0);
-			setprop("/FMGC/internal/zfwcg", 55.1); # 25KG default
-			setprop("/FMGC/internal/zfw-set", 0);
-			setprop("/FMGC/internal/zfwcg-set", 0);
-			setprop("/MCDU[1]/scratchpad-msg", "0");
-			setprop("/MCDU[1]/scratchpad", "");
+			if (getprop("/MCDU[1]/scratchpad") != "NOT ALLOWED") {
+				setprop("/MCDU[1]/last-scratchpad", getprop("/MCDU[1]/scratchpad"));
+			}
+			setprop("/MCDU[1]/scratchpad-msg", "1");
+			setprop("/MCDU[1]/scratchpad", "NOT ALLOWED");
 		} else {
 			var tfs = size(scratchpad);
 			if (tfs == 0) {