Tailplane icing
symptoms
- elevator control pulsing
- oscillations or vibrations
- abnormal nose-down trim change
- other unusual or abnormal pitch anomalies that may result in pilot-induced oscillations
- reduction or loss of elevator effectiveness
- sudden change in elevator force pulling in the nose-down direction
- and sudden uncommanded nose-down pitch.
recovery
- immediately retract flaps to the previous setting
- apply appropriate nose-up elevator pressure
- increase airspeed appropriately for the reduced flap extension setting
- apply sufficient power for aircraft configuration and conditions
- make nose-down pitch changes slowly
if a pneumatic deicing system is used, operate the system several times in an attempt to clear the tailplane of ice.