From 042257c33fee11dda8ae01e2b1f8215eb3c3d947 Mon Sep 17 00:00:00 2001
From: Konrad <konrad@auterion.com>
Date: Fri, 12 Jan 2024 11:50:17 +0100
Subject: [PATCH] TECS: fast descend only available if airspeed is available.

---
 src/lib/tecs/TECS.cpp | 3 ++-
 src/lib/tecs/TECS.hpp | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/lib/tecs/TECS.cpp b/src/lib/tecs/TECS.cpp
index 867df64caa..30f7822885 100644
--- a/src/lib/tecs/TECS.cpp
+++ b/src/lib/tecs/TECS.cpp
@@ -773,7 +773,8 @@ bool TECS::_checkFastDescend(const float alt_setpoint, const float alt)
 {
 	bool ret_val{false};
 
-	if ((_fast_descend_alt_err > FLT_EPSILON) && ((alt_setpoint + _fast_descend_alt_err) < alt)) {
+	if (_control_flag.airspeed_enabled && (_fast_descend_alt_err > FLT_EPSILON)
+	    && ((alt_setpoint + _fast_descend_alt_err) < alt)) {
 		ret_val = true;
 	}
 
diff --git a/src/lib/tecs/TECS.hpp b/src/lib/tecs/TECS.hpp
index 9192e29668..88baed65ba 100644
--- a/src/lib/tecs/TECS.hpp
+++ b/src/lib/tecs/TECS.hpp
@@ -729,6 +729,7 @@ private:
 	TECSControl::Flag _control_flag{
 		.airspeed_enabled = false,
 		.detect_underspeed_enabled = false,
+		.fast_descend = false
 	};
 
 	/**