diff --git a/ArduCopter/AP_Arming.cpp b/ArduCopter/AP_Arming.cpp
index dc1e165f739ef..189c6f6611b31 100644
--- a/ArduCopter/AP_Arming.cpp
+++ b/ArduCopter/AP_Arming.cpp
@@ -44,7 +44,7 @@ bool AP_Arming_Copter::run_pre_arm_checks(bool display_failure)
     }
 
     // always check motors
-    char failure_msg[50] {};
+    char failure_msg[100] {};
     if (!copter.motors->arming_checks(ARRAY_SIZE(failure_msg), failure_msg)) {
         check_failed(display_failure, "Motors: %s", failure_msg);
         passed = false;
@@ -224,7 +224,7 @@ bool AP_Arming_Copter::parameter_checks(bool display_failure)
         }
 
         #if FRAME_CONFIG == HELI_FRAME
-        char fail_msg[50];
+        char fail_msg[100]{};
         // check input manager parameters
         if (!copter.input_manager.parameter_check(fail_msg, ARRAY_SIZE(fail_msg))) {
             check_failed(ARMING_CHECK_PARAMETERS, display_failure, "%s", fail_msg);
@@ -291,7 +291,7 @@ bool AP_Arming_Copter::parameter_checks(bool display_failure)
 #endif
 
         // ensure controllers are OK with us arming:
-        char failure_msg[50] = {};
+        char failure_msg[100] = {};
         if (!copter.pos_control->pre_arm_checks("PSC", failure_msg, ARRAY_SIZE(failure_msg))) {
             check_failed(ARMING_CHECK_PARAMETERS, display_failure, "Bad parameter: %s", failure_msg);
             return false;
@@ -308,7 +308,7 @@ bool AP_Arming_Copter::parameter_checks(bool display_failure)
 bool AP_Arming_Copter::oa_checks(bool display_failure)
 {
 #if AP_OAPATHPLANNER_ENABLED
-    char failure_msg[50] = {};
+    char failure_msg[100] = {};
     if (copter.g2.oa.pre_arm_check(failure_msg, ARRAY_SIZE(failure_msg))) {
         return true;
     }
@@ -439,7 +439,7 @@ bool AP_Arming_Copter::mandatory_gps_checks(bool display_failure)
 
     // always check if inertial nav has started and is ready
     const auto &ahrs = AP::ahrs();
-    char failure_msg[50] = {};
+    char failure_msg[100] = {};
     if (!ahrs.pre_arm_check(mode_requires_gps, failure_msg, sizeof(failure_msg))) {
         check_failed(display_failure, "AHRS: %s", failure_msg);
         return false;
@@ -528,7 +528,7 @@ bool AP_Arming_Copter::winch_checks(bool display_failure) const
     if (winch == nullptr) {
         return true;
     }
-    char failure_msg[50] = {};
+    char failure_msg[100] = {};
     if (!winch->pre_arm_check(failure_msg, sizeof(failure_msg))) {
         check_failed(display_failure, "%s", failure_msg);
         return false;
diff --git a/ArduCopter/motor_test.cpp b/ArduCopter/motor_test.cpp
index 5c5deae8995cd..2313c30953d5d 100644
--- a/ArduCopter/motor_test.cpp
+++ b/ArduCopter/motor_test.cpp
@@ -102,7 +102,7 @@ bool Copter::mavlink_motor_control_check(const GCS_MAVLINK &gcs_chan, bool check
     }
 
     // Check Motor test is allowed
-    char failure_msg[50] {};
+    char failure_msg[100] {};
     if (!motors->motor_test_checks(ARRAY_SIZE(failure_msg), failure_msg)) {
         gcs_chan.send_text(MAV_SEVERITY_CRITICAL,"%s: %s", mode, failure_msg);
         return false;
diff --git a/libraries/AP_Arming/AP_Arming.cpp b/libraries/AP_Arming/AP_Arming.cpp
index 76f8159804ec4..9a99c614639d0 100644
--- a/libraries/AP_Arming/AP_Arming.cpp
+++ b/libraries/AP_Arming/AP_Arming.cpp
@@ -543,7 +543,7 @@ bool AP_Arming::compass_checks(bool report)
         if (!_compass.learn_offsets_enabled())
 #endif
         {
-            char failure_msg[50] = {};
+            char failure_msg[100] = {};
             if (!_compass.configured(failure_msg, ARRAY_SIZE(failure_msg))) {
                 check_failed(ARMING_CHECK_COMPASS, report, "%s", failure_msg);
                 return false;
@@ -602,7 +602,7 @@ bool AP_Arming::gps_checks(bool report)
     if (check_enabled(ARMING_CHECK_GPS)) {
 
         // Any failure messages from GPS backends
-        char failure_msg[50] = {};
+        char failure_msg[100] = {};
         if (!AP::gps().pre_arm_checks(failure_msg, ARRAY_SIZE(failure_msg))) {
             if (failure_msg[0] != '\0') {
                 check_failed(ARMING_CHECK_GPS, report, "%s", failure_msg);
@@ -1205,7 +1205,7 @@ bool AP_Arming::proximity_checks(bool report) const
 bool AP_Arming::can_checks(bool report)
 {
     if (check_enabled(ARMING_CHECK_SYSTEM)) {
-        char fail_msg[50] = {};
+        char fail_msg[100] = {};
         (void)fail_msg; // might be left unused
         uint8_t num_drivers = AP::can().get_num_drivers();
 
@@ -1494,7 +1494,7 @@ bool AP_Arming::generator_checks(bool display_failure) const
     if (generator == nullptr) {
         return true;
     }
-    char failure_msg[50] = {};
+    char failure_msg[100] = {};
     if (!generator->pre_arm_check(failure_msg, sizeof(failure_msg))) {
         check_failed(display_failure, "Generator: %s", failure_msg);
         return false;
@@ -1509,7 +1509,7 @@ bool AP_Arming::opendroneid_checks(bool display_failure)
 {
     auto &opendroneid = AP::opendroneid();
 
-    char failure_msg[50] {};
+    char failure_msg[100] {};
     if (!opendroneid.pre_arm_check(failure_msg, sizeof(failure_msg))) {
         check_failed(display_failure, "OpenDroneID: %s", failure_msg);
         return false;