Honeywell Automatic Pitch Trim Installation Manual

Automatic Pitch Trim

Installation Manual

8300-013 Rev K

Honeywell International,

Inc. 9201-B San Mateo Blvd N.E.

Albuquerque, New Mexico 87113 U.S.A.

Telephone: [phone] (Toll Free U.S.A./Canada)

Telephone: [phone] (International/Direct)

RESTRICTION ON USE, DUPLICATION, OR DISCLOSURE OF

PROPRIETARY INFORMATION

THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF

BENDIXKING. AND MAY NOT BE REPRODUCED, COPIED, DISCLOSED OR UTILIZED IN ANY

WAY, IN WHOLE OR IN PART, WITHOUT THE PRIOR WRITTEN CONSENT OF

BENDIXKING.

8300-013 1 Rev K

8300-013 2 Rev K

Table of Contents

1. Document Revision History ............................................................................. 4

Warning: ................................................................................................................... 5

2. Electrical Pinout ............................................................................................... 5

3. Retrofit to Existing Autopilot Harness ............................................................ 6

4. Pitch Auto Trim Block Diagram ...................................................................... 7

5. 28 Volt Aircraft with 12 Volt Trim System ..................................................... 8

6. Troubleshooting ............................................................................................... 9

7. Autotrim Installation ....................................................................................... 9

8. Autotrim Ground Setup .................................................................................... 9

9. Autotrim Ground Checkout ........................................................................... 10

10. Autotrim Status Lamp Indications ............................................................ 10

11. Autotrim Checkout Flowchart ................................................................... 11

12. Autotrim Troubleshooting ......................................................................... 12

13. Autotrim Dimensions ................................................................................. 14

8300-013 3 Rev K

1. Document Revision History

Rev Description Pages Date
C New Auto Trim Module All
D Updated Trouble Guide 1, 5& 6
E Updated for new autotrim design All
F Corrected Diagrams for LED 4-6 3/2/2015
G Corrected setup procedure 9 3/30/2015
H Added note to diagrams for LED polarity 4-6 7/13/2017
I Corrected Pin 16 Connection 4 10/23/2017
J Corrected Flow Chart 9 10/30/2017
K Updated for BendixKing All 2/15/2021

12/22/2009
6/3/2011
2/23/2015

8300-013 4 Rev K

Warning:

IT IS THE INSTALLERS RESPONSIBILITY TO ENSURE THAT THE TRIM
SYSTEM DOES NOT EXCEED THE ABILITY OF THE PILOT TO CONTROL
THE AIRCRAFT AT ANY SPEED WITH THE TRIM TAB AT FULL
DEFLECTION IN EITHER POSITION.
IF UNABLE TO MAINTAIN FLIGHT CONTROL WITH THE TRIM TABS AT
FULL DEFLECTION THEN STOPS WILL BE NEEDED IN THE AIRCRAFT
TRIM SYSTEM.

2. Electrical Pinout

The Trim motor control from the pilot trim switch system will pass through the
Auto Trim module when the Auto Pilot is NOT ENGAGED through a normally closed
relay internally. Once the Auto Pilot is engaged the Auto Trim will open the relay
and pulse the voltage that is applied to pin 12 / 13 and ground on pins 9 and 10
according to which direction the sense voltage from the Pitch Servo indicates to
drive the trim motor. This control voltage and ground MUST be connected to the
trim motor ONLY, it will not drive the trim relay system.

8300-013 5 Rev K