senseFly swinglet User Manual page 136

Maintenance, Repair and Troubleshooting
Airspeed
malfunction
Low airspeed
Overspeed
136
The differential pressure sensor used to measure air-
speed is registering invalid values. This may be due
to a damaged sensor or to a clogged pitot probe.
Security action: The drone flies towards the Home
waypoint at an altitude defined by the Home way-
point's Change altitude parameter (by default, set to
'Highest') at a constant thrust value instead of con-
trolled speed, potentially resulting in low or high
flight speeds depending on wind. Once it reaches the
Home waypoint it initiates a landing procedure.
User action: Land as soon as possible and perform
Check 4 in section 'Full airframe and sensor inspec-
tion' on page 119.
Detected airspeed is unusually low or close to zero.
This may be due to a collision with the ground or a
clogged airspeed sensor.
Security action: The drone shuts off its motor and
tries to continue its mission.
User action: If the warning is due to a clogged air-
speed sensor it may be due to moisture in the air.
Try commanding the drone to descend closer to the
ground and out of any cloud cover.
Detected airspeed is unusually high, possibly due to
a loss of control.
Security action: The drone applies a 50% reverse
thrust to try to slow down.
User action: Keep track of the drone's position in
case it is unable to slow back down to a regular air-
speed.