CAUSE: Check the tail "Trim" on the transmitter.

LIKELIHOOD: 1 on a scale of 1 to 20 where 1 is most likely and 20 is least likely.

REMEDY: The trim adjustment on the transmitter needs fine tuning or has been inadvertantly moved.

DIFFICULTY: 1 on a scale of 1 to 10 where 10 is most difficult and 1 is easiest.

CAUSE: The "Proportional" mix is slightly out of adjustment.

LIKELIHOOD: 2 on a scale of 1 to 20 where 1 is most likely and 20 is least likely.

REMEDY: Adjust "Proportional" pot on the 4-n-1.

DIFFICULTY: 1 on a scale of 1 to 10 where 10 is most difficult and 1 is easiest.

CAUSE: The tail motor is failing or defective.

LIKELIHOOD: 3 on a scale of 1 to 20 where 1 is most likely and 20 is least likely.

REMEDY: Replace the Tail Motor.

DIFFICULTY: 4 on a scale of 1 to 10 where 10 is most difficult and 1 is easiest.

CAUSE: The 4-n-1 unit may be defective.

LIKELIHOOD: 4 on a scale of 1 to 20 where 1 is most likely and 20 is least likely.

REMEDY: Install a new 4-n-1 unit.

DIFFICULTY: 6 on a scale of 1 to 10 where 10 is most difficult and 1 is easiest.