Service Letter CSL 2016-1

  • Print

                     

SERVICE LETTER

NUMBER CSL 2016-1

DATE 2/24/16

TO: Century Flight Systems Dealers

SUBJECT: Century 41 Pitch and Trim Servo Directions

The following information is provided as an aid in trouble shooting a Century 41 autopilot system when the Torque Sensing Pitch Servo 1C812 – ( ) or 1C822 – ( ) is replaced by a newer Century Servo 1C784 – ( ) or 1C785 – ( ) and a corresponding Servo Adapter unit 1C950-( ).

  1. If the Pitch Servo is running backwards swap pins 3 & 6 at CD 204 connector of the servo.
  2. If autotrim is running backwards and you are getting a “FAIL AUTOTRIM” on the annunciator, swap pins 7 & 2 at CD 184 at the Flight Computer and then swap pins 3 & 6 of CD 204 on the Pitch Servo.
  3. If autotrim is running backwards and you are not getting a “FAIL AUTOTRIM” on the annunciator, swap pins 3 & 6 at the Trim Servo connector. This will cause manual electric trim to run backwards so swap pins 37 & 39 on CD 184 at the Flight Computer.
  4. If the Pitch Servo is running the correct direction but you get a “FAIL AUTOTRIM” on the annunciator, swap pins 3 & 6 on CD 183 that connects to the 1C950-( ) Servo Adapter. When this is done, it will cause pitch to run backwards so swap pins 3 & 6 at the CD 204 connector on the Pitch Servo.

                                                    

Lottie J. Eubanks

President