From e2879b375ddf44276284df76b24d5efe4af04f88 Mon Sep 17 00:00:00 2001
From: Robert Lefebvre <robert.lefebvre@gmail.com>
Date: Mon, 28 Dec 2015 19:06:11 -0500
Subject: [PATCH] Copter: fix Ch6 Tuning when no RC Receiver on boot

---
 ArduCopter/tuning.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ArduCopter/tuning.cpp b/ArduCopter/tuning.cpp
index 86fac7a669..2b3ca930ca 100644
--- a/ArduCopter/tuning.cpp
+++ b/ArduCopter/tuning.cpp
@@ -11,8 +11,8 @@
 //  should be called at 3.3hz
 void Copter::tuning() {
 
-    // exit immediately if not tuning of when radio failsafe is invoked so tuning values are not set to zero
-    if ((g.radio_tuning <= 0) || failsafe.radio || failsafe.radio_counter != 0) {
+    // exit immediately if not using tuning function, or when radio failsafe is invoked, so tuning values are not set to zero
+    if ((g.radio_tuning <= 0) || failsafe.radio || failsafe.radio_counter != 0 || g.rc_6.radio_in == 0) {
         return;
     }