TruTrak Automatic Pitch Trim User Manual
Installation Manual
For
8300-013 Rev C
Automatic Pitch Trim
TRUTRAK FLIGHT SYSTEMS
1500 S. Old Missouri Road
Springdale, AR 72764
Ph: 479-751-0250 Fax: 479-751-3397
www.trutrakap.com
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.
Table of Contents
Electrical Pin-Out.................................................................................................................1
Automatic Pitch Trim Ground Checkout..........................................................................2
Retrofit to existing autopilot harness.................................................................................3
Pitch Auto Trim Block Diagram.........................................................................................3
Roll Auto Trim Block Diagram ..........................................................................................4
28 Volt Aircraft with 12 Volt Trim System .......................................................................4
Manual Auto Trim Switching.............................................................................................5
Trouble Shooting..................................................................................................................5
RETURN MERCHANDISE POLICY...............................................................................6
Revision Date Discription Pages
C 12/22/2009 New auto trim module All
Electrical Pin-Out
The table below provides a brief explanation of each pin function on the 25-pin connector P101.
P101 Pin Function Notes
1 No Connection. Reserved for future expansion.
2 No Connection. Reserved for future expansion.
3 Pitch Servo Trim Sensor. Pitch servo trim sensor output to autopilot programmer. @2.5 v AP engaged no load
4 Pitch Servo Trim Sensor. Pitch servo trim sensor input from pitch servo pin 7. @2.5 v AP engaged no load
5 Torque Control. Pitch servo torque control input from autopilot programmer. @5 volt, AP engaged
6 Torque Control. Pitch servo torque control output to pitch servo. @5 volt, AP engaged
7 No Connection. Reserved for future expansion.
8 Trim Switch 1. Line 1 to existing trim switch.
9 Motor 1. Line 1 to existing trim servo motor. Will not control relays Voltage in @max 5 amps
10 Motor 2. Line 2 to existing trim servo motor. Will not control relays Voltage in @max 5 amps
11 Trim Switch 2. Line 2 to existing trim switch.
12 Power. Connects to autopilot master or pitch servo power line from programmer. 11 – 35V input
13 Power. Connects to pitch servo pin 1.
14 Ground. Ground connection to link sensor.
15 Ground. Connect to aircraft ground. Aircraft ground
16 Ground. Ground connection to pitch servo pin 9.
17 No Connection. Reserved for future expansion.
18 PH1P. Servo drive line output to pitch servo pin 3.
19 PH1P. Servo drive line input from programmer
20 PH1N. Servo drive line output to pitch servo pin 2.
21 PH1N. Servo drive line input from programmer
22 PH2P. Servo drive line output to pitch servo pin 5.
23 PH2P. Servo drive line input from programmer
24 PH2N. Servo drive line output to pitch servo pin 4.
25 PH2N. Servo drive line input from programmer
1
2345678910111213
14 15 16 17 18 19
20 21 22 23 24 25
25-Pin Connector P101
The Auto Trim controller MUST be wired directly to the aircraft trim motor. If the aircraft
manual trim system uses a relay system the Auto Trim connects on the motor side of the
relay system.
Total Weight Voltage Current Trim Motor Output
.5 LB 11 V – 35 V .25 A – 5 A Input voltage / 5 Amps
Auto Trim Installation Manual 1 TruTrak Flight Systems
December 2009 8300-013 Rev C
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