Tailplane Icing Symptoms

Tailplane icing is diagnosed by the following conditions:

1. Elevator control pulsing, oscillations, or vibrations

2. Abnormal nose-down trim change

3. Pitch anomalies

4. Reduction or loss of elevator effectiveness

5. Sudden nose-down pitch (control would move nose-down if unrestrained)

A tailplane stall resulting from ice accumulation on the horizontal stabilizer is most likely to occur during the extension of flaps to the landing position.

Tailplane Icing Procedures

1. Immediately retract flaps to previous setting and apply nose-up elevator pressure.

2. Increase airspeed appropriately for the reduced flap extension setting.

3. Apply sufficient power for aircraft configuration and conditions.

4. Make nose-down pitch changes slowly, even in gusting conditions if circumstances allow.