Avionics List
new and used avionics

Sell your avionics
Advanced avionics search
Avionics Articles and Reviews
Used Avionics Buying Guide

STEC 55 Autopilot Computer and other parts

Cirrus Autopilot Computer, STEC A/P and Alt Selector


View Pictures

Bid or Purchase
Current Price: 5,000.00 USD Buy It Now Price: 5500.0 USD Ends in: ended

I have a collection of STEC parts that I was going to put together for another experimental aircraft project.  The main flight computer is from a Cirrus.  The remainder of the parts are from other installations. 

I currently have an STEC 55X in another flying airplane and I have checked out this 55 computer and it works fine.  The pictures are of THIS 55 installed in my panel and connected to the Garmin 530W.  You can see that it powers up and goes to RDY(Ready) Mode.  The G530W is ouputting NAV info and the 55 shows it working in NAV and ALT mode. APP and Heading mode are also shown engaged.  The other parts include a wiring harness that may be modified for this system, but are not be specific to the 55.  The Altitude selector/alerter powered up fine, but I have no facilities to bench check it for all functions. 

Although the sticker on the autopilot computer shows 28VDC, the unit also works fine on 14VDC, as indicated in the photos.  The lighting for the bezel may be 28VDC, I don't know.  The sticker shows it currently configured for EDO NSD360A heading system.

Included in this sale:

1) The STEC 55 Flight Computer PN 12721-002
2) New Tray currently wired for a single plug installation. PN12721-101
3) Servo (14VDC) No PN
4) Wire Harness The connectors should fit this tray and the one connector is for the rate gyro that is not included.  One connecter for Heading Gyro.
5) Altitude selector/alerter LCD System PN 01279-PX
6)  Pressure transducer (blue thing)   

I'm also throwing in some nylon spacers, various servo parts, bridal cable connectors, home made service jumper for servo and ALSO a servo bridal spindle that is NOT shown in the picture.

Info on Altitude Selector.

Digital vertical speed select for climb or descent
  • - Pre-select and capture altitude; with visual and aural alerts
  • - Alerts if aircraft departs selected altitude
  • - Selectable DH (decision height) or MDA (minimum descent altitude), with visual and aural alerts
  • - Monitor outputs of altitude encoder
  • - Automatic vertical speed reduction prior to altitude capture
  • - Panel mounted programmer/annunciator with LCD display
  • - Completely case-contained
  • - Requires input from aircraft’s altitude encoder
  • - Power required:14/28 VDC
  • - Weight:1.25 lbs.
  • - Dimensions:1.6” x 3.42” x 6.75”
  • - Approved to TSO C9c


I believe the computer may also work on the 28V system, but I'm not sure...The Altitude Controller/Alerter works on both.

This is listed as a "parts" only ad as it is not complete.  A gyro is also required, as well as another servo.

This is a fantastic autopilot.  It will take some installation specific tuning to make things work.  I don't want to give up on this project, but more
important things have come my way.  Someone should get the makings of a great setup...The altitude alerter/selector alone is selling at nearly $3800.  One recently sold on Ebay for $1500. 

IF you're not really into electrical projects, this is not for you.  It will take someone with wiring skills and autopilot familiarly to get this up and running.  You will need another servo and the rate based gyro for the gyro platform.  The computer can be modified for various heading systems.


Here's a Utube video of an approach with this autopilot and altitude selector:  http://www.youtube.com/watch?v=aTRqUtODD4k

Other links:

http://www.sarasotaavionics.com/Manuals/stec/st360.pdf

http://www.rwrpilottraining.com/01279ASAPOH.pdf

http://www.csobeech.com/files/S-Tec55Manual.pdf

International Shipping to pay actual shipping/handling costs.  I will ship US only for free.

Questions?  Al... 817 578 0206

STEC 55 Autopilot Computer and other parts  STEC 55 Autopilot Computer and other parts  STEC 55 Autopilot Computer and other parts
STEC 55 Autopilot Computer and other parts  STEC 55 Autopilot Computer and other parts  STEC 55 Autopilot Computer and other parts
STEC 55 Autopilot Computer and other parts  STEC 55 Autopilot Computer and other parts  STEC 55 Autopilot Computer and other parts
STEC 55 Autopilot Computer and other parts  STEC 55 Autopilot Computer and other parts  STEC 55 Autopilot Computer and other parts


Bid on or purchase this item.

©2013 AvionicsList.com | links | [RSS] | contact | privacy policy