diff --git a/pySim/ts_51_011.py b/pySim/ts_51_011.py
index 37d2bc8..8b73f02 100644
--- a/pySim/ts_51_011.py
+++ b/pySim/ts_51_011.py
@@ -313,4 +313,14 @@
 	57: 'Multimedia Messaging Service (MMS)',
 	58: 'Extension 8',
 	59: 'MMS User Connectivity Parameters',
-}
\ No newline at end of file
+}
+
+# 10.3.18 "EF.AD (Administrative data) "
+EF_AD_mode_map = {
+	'00' : 'normal operation',
+	'80' : 'type approval operations',
+	'01' : 'normal operation + specific facilities',
+	'81' : 'type approval operations + specific facilities',
+	'02' : 'maintenance (off line)',
+	'04' : 'cell test operation',
+}