diff --git a/plane/source/docs/airspeed.rst b/plane/source/docs/airspeed.rst index cdd8f2df0c..0d366dcc04 100644 --- a/plane/source/docs/airspeed.rst +++ b/plane/source/docs/airspeed.rst @@ -143,6 +143,11 @@ By default, these functions are disabled. :ref:`EKF3 affinity and lane switching ` is another option for dealing with airspeed sensor failure. +Balloon Drop +------------ + +In the special case of a high altitude balloon drop, the EKF will declare the airspeed sensor faulty since there is gps speed but no airspeed due to air density. This can result in TECS miss-applying pitch. In this special case , the :ref:`AHRS_OPTIONS` bit 2 can be set to prevent EKF from declaring the airspeed sensor as faulty and continue to use it. + .. _arspd-sensor-list: Airspeed sensors available from ArduPilot Partners: