Honeywell Automatic Pitch Trim Installation Manual

Automatic Pitch Trim

Installation Manual

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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

PROPRIETARYINFORMATION

THIS DOCUMENT CONTAINSPROPRIETARY INFORMATION OF

BENDIXKING. AND MAY NOTBE REPRODUCED, COPIED, DISCLOSED OR UTILIZED IN ANY WAY, IN WHOLE OR IN PART,WITHOUT THE PRIOR WRITTEN CONSENT OF BENDIXKING.

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Table of Contents
1.	DocumentRevision 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 LampIndications ............................................................		10
11.	Autotrim Checkout Flowchart...................................................................	11
12.	Autotrim Troubleshooting.........................................................................	12
13.	Autotrim Dimensions.................................................................................	14

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1. Document RevisionHistory

Rev	Description	Pages	Date
C	New Auto Trim Module	All	12/22/2009
D	Updated Trouble Guide	1, 5& 6	6/3/2011
E	Updated fornew autotrim design	All	2/23/2015
F	Corrected Diagrams for LED	4-6	3/2/2015
G	Corrected setup procedure	9	3/30/2015
H	Addednote todiagrams 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 forBendixKing	All	2/15/2021

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Warning:

ITIS THE INSTALLERS RESPONSIBILITY TO ENSURE THATTHE TRIM SYSTEM DOES NOT EXCEED THE ABILITY OFTHE PILOTTOCONTROL THE AIRCRAFT ATANY SPEED WITH THE TRIM TAB ATFULL DEFLECTION INEITHER POSITION.

IF UNABLE TOMAINTAINFLIGHT CONTROL WITH THE TRIM TABS AT FULL DEFLECTION THEN STOPS WILL BE NEEDED INTHE AIRCRAFT TRIM SYSTEM.

2. Electrical Pinout

The Trim motor control fromthepilot trim switch systemwill pass through the Auto Trim module when the Auto Pilot is NOT ENGAGED through a normallyclosed relay internally. Once the Auto Pilot is engaged the Auto Trim will open the relay and pulse the voltage that is applied topin 12/ 13and ground on pins9 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 motorONLY, it willnot drive the trim relay system.

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