diff --git a/central-manager/lib/data.h b/central-manager/lib/data.h
index b5d5171..014fb4f 100644
--- a/central-manager/lib/data.h
+++ b/central-manager/lib/data.h
@@ -17,6 +17,7 @@
     #define TERMREQ_CAP 0x02
     #define TERMREQ_SPD 0x04
     #define TERMREQ_ALT 0x08
+    #define TERMREQ_OFF 0x10
 
     #define PLANE_LEN     ( sizeof(char)*6+sizeof(int)*5 )
     struct plane{
diff --git a/central-manager/lib/local/handler.c b/central-manager/lib/local/handler.c
index d65576e..0d06a80 100644
--- a/central-manager/lib/local/handler.c
+++ b/central-manager/lib/local/handler.c
@@ -137,7 +137,7 @@ void* managePlane(void* THREADABLE_ARGS){
 		}
 
 		/* 4. On copie/met à jour les valeurs */
-		if( tmpFlags != 0x10 ){ // gestion réponse ctrlTerm
+		if( tmpFlags != TERMREQ_OFF ){ // gestion réponse ctrlTerm
 			arg->sgca->unit[pindex].flags = tmpFlags;                                    // on met à jour les flags
 			while( arg->sgca->unit[pindex].thrId == 0xf0 );                              // on attend le numéro de thread
 			printf("{tcp_com}(%d)             Waking up UDP threaad@%d for ctrlTerm response\n", index, arg->sgca->unit[pindex].thrId);
@@ -264,7 +264,7 @@ void* manageViewTerm(void* THREADABLE_ARGS){
 		sent = recvfrom(arg->socket, buffer, 1, 0, (struct sockaddr*) &clientInfo, &len);
 
 		/* 2. Gestion erreur (erreur ou mauvais feedback != 0x10) */
-		if( sent <= 0 || buffer[0] != 0x10 ){
+		if( sent <= 0 || buffer[0] != TERMREQ_OFF ){
 			printf("{udp_vterm}{com}(%d)      Unable to recv feedback -> exiting\n", index);
 			break;
 		}
@@ -420,7 +420,7 @@ void* manageCtrlTerm(void* THREADABLE_ARGS){
 			/* 3. Si on a pas trouvé -> on quitte l'udpdate */
 			if( pindex <= -1 || arg->sgca->unit[pindex].socket <= -1 ){
 				printf("{udp_cterm}{com}(%d)      Plane unknown or unreachable, passing\n", index);
-				request.flags = 0x10;
+				request.flags = TERMREQ_OFF;
 				break;
 			}
 
@@ -439,7 +439,7 @@ void* manageCtrlTerm(void* THREADABLE_ARGS){
 			/* 3. On envoie la requête à l'avion */
 			if( send(arg->sgca->unit[pindex].socket, buffer, count/sizeof(char), 0) <= 0 ){
 				printf("{udp_cterm}{com}(%d)      Cannot send request to plane\n", index);
-				request.flags = 0x10;
+				request.flags = TERMREQ_OFF;
 				break;
 			}
 
@@ -450,11 +450,11 @@ void* manageCtrlTerm(void* THREADABLE_ARGS){
 			arg->sgca->unit[pindex].thrId = index;
 			sleep(2);
 			flags = arg->sgca->unit[pindex].flags; // on récupère les flags
-			arg->sgca->unit[pindex].flags = 0x10;  // on reset les flags
+			arg->sgca->unit[pindex].flags = TERMREQ_OFF;  // on reset les flags
 
-			if( flags == 0x10 ){
+			if( flags == TERMREQ_OFF ){
 				printf("{udp_cterm}{com}(%d)      Cannot get response from plane %d bytes (%d expected)\n", index, count, (int) PLANE_LEN);
-				request.flags = 0x10;
+				request.flags = TERMREQ_OFF;
 				break;
 			}
 
diff --git a/plane/plane.c b/plane/plane.c
index 68133c2..586efad 100644
--- a/plane/plane.c
+++ b/plane/plane.c
@@ -304,13 +304,13 @@ void update(){
   int             received;
   struct sgca_req request;
   char            buffer[MAX_BUF_LEN] = {0};
-  char            persistentFlags     = 0x10;
+  char            persistentFlags     = REQ_OFF;
 
   while( 1 ){
 
     calc_ctrl();
     send_data(persistentFlags);
-    persistentFlags = 0x10;
+    persistentFlags = REQ_OFF;
 
     /* [1] Gestion réception avec timeout
     =========================================================*/
diff --git a/plane/plane.h b/plane/plane.h
index dd88ffb..67a682f 100644
--- a/plane/plane.h
+++ b/plane/plane.h
@@ -53,6 +53,7 @@
     #define REQ_CAP 0x02
     #define REQ_SPD 0x04
     #define REQ_ALT 0x08
+    #define REQ_OFF 0x10
 
     struct sgca_req{
         char flags;