CYSH And it is intermittent. But these lines are now14 years old, and it's been very hot here lately even in the hangar, so that's my first guess. OK so removed the plugs visually inspected, sprayed them with contact cleaner and replaced. It is for a beech but the electrical installation should be the same. It's a real shame that STEC is so greedywith transferring the STC!
A2A Piper Cherokee 180 S-TEC 30 Autopilot Tutorial - YouTube Make sure it springs out after you push it in. The GFC500 has been installed a few times in Mooneys for $17K or so. If a functional one is on the airplane already, its real nice. then the System 30 ALT may be the economical solution to your problem.
. three GFC500 servos installed is 40 hours of labor on a Piper. Its been working just fine since then. First thing I tried was crawling under the panel and finding the connector between the pressure switch and the control module. Features. It is working fine except for slight a slight porpus at altitude hold engagement. Thanks again to all. Your link has been automatically embedded. Dev - make sure there is no water in the static system. Guessing it will cost just about the same for installation, I think you'd be better off to contact them to make sure my estimates are still goodand whether the deal for the 55X still stands. annual on both the pitch and roll servo using the old elt battery when I had a STEC 30 and experienced the problem once. As a last ditch effort I sprayed the pitch servo with electrical contact cleaner (sprayed the end with the brushes). smv Pattern Altitude Joined: Dec 30, 2019 Messages: Pretty much lucked out because it wasn't on my list of "must have" items when I was plane shopping. See last pages of the STEC-30 installation manual ALT lamp is illuminated onAP display. When I had the same problem (and same A/P)in my J-model we discovered the static lines were cracking with age and the leaks were causing this behavior, but it was much more gentle than what I experienced last weekend. Upload or insert images from URL. By Your avionics tech will most likely need to send the servo to Genesys.
S-Tec 30, worth the effort? - Mooneyspace.com Audible alert is squelched". Be careful about models because the III may not be the same as the IIIc. Painful topic - my own personal saga with the STEC-30, which I think has the same basic altitude hold system, is in the thread below. A simple, but in depth tutorial covering most aspects of the autopilot found in A2A's Piper Cherokee.
Stec 30A altitude hold for sale $2800 - Pilots of America We have placed cookies on your device to help make this website better. Also, these servos have a maintenance routine that may need to be conducted. Double check the mode select button on the turn coordinator. I'm VERY glad my plane had an AP installed when I bought it. Supporter; 848 Beyond that your best bet is to find someone familiar with the autopilot and connected systems and have them accompany you on a test flight. Sending in one part pf after another gets very expensive without fixing it. Went out for a scenic cruise with my brother last weekend and my always-trusty S-TEC 55x A/P altitude hold was on the fritz as soon as I activated it. Altitude Hold, Stabilization, Heading, and tracking VORs and GPS waypoints.If you just need info on one particular mode of the autopilot, you can skip to the relevant section by using the links below.Altitude Hold: http://youtu.be/-96FkQ8LP50?t=1m48sStablilization Mode: http://youtu.be/-96FkQ8LP50?t=2m16sHeadling Mode: http://youtu.be/-96FkQ8LP50?t=3m4sTRK Lo/HI with VOR/LOC: http://youtu.be/-96FkQ8LP50?t=4m38sTRK Lo/Hi foth GPS: http://youtu.be/-96FkQ8LP50?t=5m43s The same thing happened to mine several years ago. The converter isnt actually by-passed in HDG mode. So I've done this and so far things seem to be working better! You can post now and register later. Definitely follow through with Chris' @Marauderadvice on the Static line checks and the Alt hold sensor. With that in mind, and after reading this thread, I gently wiggled the connectors to see if that would solve the problem, and it did; on the ground, but the moment the engine started the vibration caused the fault to emerge, literally as the engine ran the light came on again, intermittently then constantly. If you swap the ST-901 for trouble-shooting you need to ensure its set-up for the correct heading source. So I don't really know the cause, but it's working now and I have steps to diagnose if it comes back. Got to get some good experience hand flying again. Building block concept allows upgrading to a System Thirty or a full two-axis System FiftyFiveX autopilot.
Century IIB autopilot - General Mooney Talk - Mooneyspace.com - A We have placed cookies on your device to help make this website better. SYSTEM 30 ALT Brochure / Manual. I don't know the breakdown on a fresh install for a Mooney, but three GFC500 servos installed is 40 hours of labor on a Piper. Upload or insert images from URL. I think you'd have a hard time beating that price by more than one or two AMU's with a used STEC flying. The GNS430. The ST-901 is the only thing attached to the autopilot heading error input and switches between the two sources. If you have an account, sign in now to post with your account. Features include a small inch square, panel-mounted On/Off switch to engage the altitude hold function and annunciate out-of-trim conditions. It seems like there might be something very simple that's wrong, and I might be about to blow 2amu for nothing. Powered by Invision Community. Display as a link instead, It went up and down about 30' from its assigned altitude. It happens to me prettyconsistently when flying right at nightfall, making me think it's some kind of condensation issue somewhere in the system as the air cools, or maybe when the air becomes smoother?
HELP another STEC 30 altitude hold oscillation thread, "Engage altitude hold mode. Is there a simple upgrade path from the Century III's to the Stec's? When the HDG/GPSS mode is in GPSS mode, the Autopilot tracks perfectly. FEATURES. Do the same for aft control wheel. With a rather curious intermittent fault.
S-TEC System 30 Autopilot - Sarasota Avionics Thanks for all the really interesting and useful input from everyone. 619 Location: West Memphis Reg #: 5687Q Model: 1965 M20C Posted November 22, 2018 This happened with our STEC a little while ago. It does tend to point to a duff instrument, but if you have a broken wire that could be picking up RF etc and if you drive an LED with AC it can glow with a varying brightness. Powered by Invision Community. You cannot paste images directly. To close the loop (for now!) Sent from my iPhone using Tapatalk Pro, Try not trimming it too perfectly, adjust it so its slightly out of trim. And then about 7 hours labor for removal, install, and bench check. However, if youre starting with no autopilot, Id bite the bullet with the gfc500 and get newer, better technology and many more functions. Attitude information is more advantageous for rapid recovery from in-flight upsets. Is it a fault in the HSI, in the STEC, or (less likely) in the converter? But it seems the lack of work for the brushes are what cause the issues. Might want to try the alternate air source while its misbehaving to see if that helps or changes the behavior. If however the GPSS mode switch is in GPSS mode it extinguishes, so the leakage is happening only when the converter is in HDG mode, so something is happening between the HSI and the STEC, when the Converter is switched out of the circuit. Upload or insert images from URL. Check voltage on servos, check all airframe and cable tension, replace Alt transducer with temp, remove static tubes on alt transducer.
Next steps.
Curious behaviour of the Heading Bug - STEC 30 - EuroGA (1) Flight 1: Cruise at 9000, OAT ~-10, sometimes smooth, some patches of significant turbulence encountered over 2 hours, and altitude hold works perfectly. This is a fix that was given to me by an STEC tech back in '05. The Century products can be made to work but it will generally take a lot of time and money and parts can be hard to find. Any attempt to centralise the bug produces a turn to the right. Tom.
STEC-30 Altitude Hold - General Mooney Talk - Mooneyspace.com Altitude Hold Mode Manually fly the airplane to the desired altitude and level off A roll mode must be selected prior to engaging a pitch mode Select ALT mode on autopilot mode controller Altitude may be fine tuned using the VS knob 20 foot increments Maximum authority +/- 360 feet NOTE .
Autopilot not flying courseline on approach - Avidyne Online Community Pitch trim: My STEC-30 has altitude hold but no VNAV. The heading signal wont be flowing through it. It would be a completely new install. Try not trimming it too perfectly, adjust it so its slightly out of trim.Tom, Dev - make sure there is no water in the static system. Downfall is that it has to get back to STEC to get recertified for install to your aircraft legally under the STC. Thoughts? Upload or insert images from URL. The fault only arose on the first flight after lockdown, so that is a clue, No one seems to have had the same issue, but it is a common installation, so I am hoping someone has a steer for me (excuse the pun).
navigation - What are the differences between a GPS coupled autopilot Engaging it when out of trim seems to help. The LED is probably a redherring. Roughly, it will cost you about half of the purchase price of a new model to get it through the S-Tec process of getting an STC for your airplane. Downfall is that it has to get back to STEC to get recertified for install to your aircraft legally under the STC. Every annual I would "clean" the servo armatures and that kept it rock solid. . added value to purchase/selling, and anything else you want to add. So the next stage is to unplug the connector to the roll steering computer, clean and inspect the pins from the front, and replace. After 7 seconds, TRIM UP lamp flashes and audible alert becomes periodic. Congratulations. (2) Flight 2: The very next day, I cruise at 8000 in mostly smooth air, OAT ~-13. Heading mode worked perfectly on the ground and then for 15 minutes in flight,, before the problem came back. Be interesting to see if the price of "transfer of STC" comes down from S-Tec as these new A/P's hit the market if they don't lower it, they're dead. Altitude Hold, Stabilization, Heading, and tracking VOR. Will have better pictures shortly. Discussion in 'The Classifieds' started by wrighthenry, Jul 25, 2017. 2. . 2AMU. work perfect in one axis with GNS so I expected that S-TEC 55 can also keep glideslope not just be ALT hold if . Pa28-140 Pre-takeoff checklist Joined: Dec 6, 2009 Messages: 192 Location: Kansas City suburb Display name: Gordon Shumway I'm having an issue with my altitude hold on the STEC 30 autopilot. Just as you say, you can guess what will happen now.in IMC on the glideslope of course. The noise is very annoying Thanks! Your previous content has been restored. Issue occurs if auto trim on or off or if in ALT hold of VS set to zero. Specifically: (1) The system ground tests fine per the manual (2) the cables from the tail servo are at correct tension levels (tested at annual) (3) pitch controls are well-lubed and not binding anywhere (4) avionics guy sprayed contact cleaner in the servo. We are fortunate to be flying the test model of the trio.
S-Tec 30 in the IFR world | Pilots of America You can post now and register later. The ST-901 converts the ARINC 429 label 121 (Horizontal Command to Autopilot) which is a precise bank angle to a heading error signal. It can separate the wannabes from the real mechanics for sure. CESSNA STEC 30 ALTITUDE HOLD ATTENTION WHOLESALE BUYERS This is alt. If I was buying an airplane with an stec30A Id be fine with that. Might want to try the alternate air source while its misbehaving to see if that helps or changes the behavior. Garmin also announced theirs for this fall. TruTrak, Pro Pilot, and I think Dynon is working on an STC as well. 9 I'm trying to understand the differences here between an autopilot that is "coupled" into a GPS/NavCom like a Garmin 530W and what GPSS and altitude hold (like in an S-TEC 50 autopilot) have to do with this. If you have an account, sign in now to post with your account. ). Out of curiosity, what sort of aircraft are you looking at? Jan 23, 2011 Messages: 133 Location: Clemson, SC Display name: wrighthenry Selling our Stec 20 altitude hold. Only those on Dave Ramsey's approved list. I would replace that before I messed with replacing servos. You cannot paste images directly.
Adding an autopilot | Land and Hold Short By Manufacture charged $1375 for overhaul. The ST-901 is wired as an output to the autopilot heading error signal input. And my A&P did also spray Tri-Flow on the yoke shaft, which was binding a little. I will guide you to lear the functions and operations of the available. Worth the cost vs the Brittain? Can anyone explain this to me? Your link has been automatically embedded. I wondered if Boeing had secretly upgraded thefirmware without telling me. After 7 seconds, TRIM UP lamp flashes and audible alert becomes periodic. I just had it painted and understand very well the balancing act of deciding what "needs" an upgrade. Powered by Invision Community. Ill likely be selling my S-TEC 30 once Dynon gets their AP approved. Aircraft Factory (a division of A2A Simulations). The pitch servo is the most complicated servo of the autopilot system. 7 is ground.
S-TEC 30 Autopilot Operation - YouTube 3. Your link has been automatically embedded. Paste as plain text instead, The Stec 30 is driven by an NSD 360 HSI in heading mode and VOR/LOC Tracking Modes. Otherwise, to troubleshoot, you need to check the signals properly. He then removed the pitch servo and connected it to a power supply on the bench. Specs. Move A/C Control Wheel as far forward as possible. And the altitude would oscillate up and down by about 30. The good news is that the S-TEC 20 can easily be upgraded to an S-TEC 30, which does support altitude hold and electric trim. What are used S-TEC 30 systems going for nowadays? Before I do that, I thought I would describe the behavior of the system on my last twoflights and see if anyone has ideas: (1) Flight 1: Cruise at 9000, OAT ~-10,sometimes smooth, somepatches of significant turbulence encountered over 2 hours, and altitude hold works perfectly. The trim servo started fine with the D-cell, the pitch servo did not.
BeechTalk.com BT - problem-stec 30 w/altitude hold yes, the cost is significantly more on paper, but install is about the same and youll have to pay stec to get the stc for your airplane. AFaIK they both can use a 52D67 or 52D167 horizon gyro. The altitude hold oscillates wildly by 150 feet or more. OK; with nobody in the business being bothered about helping somebody out let me have a go. Derives all input from solid state absolute pressure transducer and accelerometer. No way I'd spend $20K. This function is also available by use of the control wheel mounted altitude engage/disengage switch, for added convenience. Even without installation, $4K for the system would be a bargain. My problem got worse and worse until it liked to behave like an prototype for the 737 MAX MCAS system The Vizion comes in three modelsstandard, 3-inch and flat pack, all for the same price of $5,000. Thanks! Anyone ever heard of this? 2. Or some connecting pins bridging somewhere due to corrosion. Furthermore, the glow remains if I use the Autopilot to track a VOR/LOC or in steering mode, but with no adverse effect. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. The gizmo is about 1.5 round and an inch thick. I don't have any suggestions in your part of the country but you want someone that has both the expertise and equipment to diagnose the issue. If nothing shows up, before you pull servo's or any parts to send in for bench checking I highly recommend you take the time to make a flight to a shop that has full capabilities on working on your auto-pilot. You can post now and register later. It was the pitch servo itself. Maybe there is no difference, I really need this explained. He jumped the power terminals on the trim servo, and then the pitch servo with a D-cell battery. I painted the contacts with Stabilant 22. A nice one to have, but should work without. Jeff, run the servo motor in each direction for about a minute to clean the armature. Jeff_S Mooneyspace.com Interesting - I tried this manual procedure a while back and it seemed fine - I didn't realize the potential for it to be both diagnostic and therapeutic - will try again. When the HDG/GPSS mode is switched to HDG (bypassing the converter) the null on the HDG bug intermittently has a fault, where the aircraft will hold level with about an 80 degree left offset of the bug. Display as a link instead, Hang 4, Aug 2, 2020 #2 N1120A and Stan Cooper like this. keep me posted. My mechanic sprayed the shaft with ??? Features. The principle difference is that the III can be a handful when the autopilot goes offline when flying an approach while the IIIc is fairly benign. Do you normally fly at 1500 feet with the control lock in? The solution came from the Stec field rep who lives in your neck of the hills. Any other thoughts or ideas on this? We have placed cookies on your device to help make this website better. Pitch trim annunciator. If your connectors are corroded then a contact spray may help but really you will get other problems in due course. When you turn off the trim, does the altitude hold work? More sharing options. The glow happens whenever the HGD/GPSS converter is set to HDG, regardless of whether the Autopilot is tracking. ALT lamp is illuminated on. Pasted as rich text.
Problem with S-TEC 55X Autopilot in Bonanza A36 But when everything is accounted for, it is a $20k proposition installed, be it a basic Garmin installation or theused or refurbished S-Tecs. Prop 65 Warning: This product may contain chemicals known to the State of California to cause cancer, and birth defects or other reproductive harm. Somewhere there is voltage leaking into an otherwise unused LED in heading mode causing it to offset its null. The altitude holdoscillates wildly by 150 feet or more. The III senses tension in the elevator wires (I believe) and the IIIc senses voltage to the elevator servo. Comanche 250s represent a good deal, too. The ST-901 switch/annunciator switches what is driving the autopilot heading error input from the real heading error signal from the NSD 360 HSI or the generated heading error signal from the conversion of the GPS bank angle. It does seem that the Autopilot is not at fault, as it only has one input for the left/right error signal, which clearly is working as advertised when the converter is in GPSS mode.
Tim Buckley wrote:Might try a few 360 degree turns in both directions using heading mode to clean the servo. Condition: Discontinued Warranty: Not Specified Add to List Compare Questions? If you have an account, sign in now to post with your account. I asked Genesys if there was anything I could do preventably to extend the life of the pitch servo. My avionics tech had a neat trick. A heading bug is normally a voltage, plus or minus x mV either side of straight ahead and this is easy to check. Sent it out for flat-rate service and it's been rock solid ever since. 7 hours, YIKES!
STEC 30 - silence the altitude alerts | Pilots of America Paste as plain text instead, It is designed to provide an economical solution for aircraft owners who need altitude hold, but dont need the additional pitch functions such as vertical speed command or glide slope capture. Had a similar problem and replaced a directional gyro that was getting tired and precessing quite a bit. This happened with our STEC a little while ago. Avidyne is in the process of certifying their DFC90 autopilot (a very capable very modern microprocessor controlled system) on several aircraft with the ability to interface with existing Century III servos (and some others). I will run it by the avionics guy next time it's in the shop -probably more than I should be messing with. (You must log in or sign up to reply here. That's $4k alone in labor plus the rest of the panel work on top of that. You cannot paste images directly. and the binding stopped along with the oscillating. And it glows whether or not the autopilot is engaged. There are some subtle differences between the III and the IIIc with autotrim. If that doesnt work I will remove the connector shell and inspect the connections between wires and pins for intermittent joints. We are actually getting the Trio system in the next few weeks.
PDF S-tec System 50 Two-axis Automatic Flight Section Ii Guidance System Paul (user handles is something like kortespate)I think once described it. Number 2 first. Paste as plain text instead, $4000 obo Sent from my iPhone using Tapatalk wrighthenry, Jul 25, 2017 #1 Caramon13 Pattern Altitude Joined: May 18, 2015 Messages: 2,261 Location: Sarasota, FL Display name: I'd give a hard look at Mooneys. Then I get dropped down to 6000 feet, still in pretty smooth air, and it works perfectly for the rest of the flight at multiple lower altitudes ! The only caveatis if they run into something not their fault and must be addressed such as corrosion or other airframe issues beyond the scope of the job. Two-axis autopilot combining Altitude Hold with the roll axis function of the, Independent system- does not require interfacing to altimeter or attitude gyro, Derives all input from solid state absolute pressure transducer and accelerometer, Compact, remote-mounted pitch computer and amplifier, Smoothly holds existing altitude when engaged; can be activated during climb or descent, System senses out-of-trim conditions and annunciates direction to adjust pitch trim, Utilizes single, remotely-mounted Of/Off Switch to engage and disengage Altitude Hold, ** CALL FOR INSTALLATION PRICE - OVER THE COUNTER SALES ONLY FOR EXPERIMENTAL AIRCRAFT. One correction to my description: The HSI is an NSD-1000 Slaved (Electric version of NSD 360). I had a chronic problem with my STec 55 (non X) porpoising. VS is controlled by the pitch servo and doing that would give the brushes some movement. Sadly I already tried that one, forgot to mention above. So if GPSS works, that eliminates the autopilot as being the issue. (Obviously, be sure the autopilot is off and the airplane is trimmed up before takeoff.). Your only hope then is to find a bad connection by accident; failing that, attach some wires to some signals, bringing them back to the cockpit where they can be probed, and go for a flight with somebody checking the voltages.
Genesys Aerosystems SYSTEM 50 Two Axis Autopilot This is also infuriating for a system that I installed for >15amu about 4 years ago, particularly when there is a 7amu Trutrak system that is superior just around the corner. There are many potential causes. The first two are 5-6k for the install kits, servos, and autopilot itself. Hereis a quick read that might be helpful. Replace each of these LRUs in turn.
Product Information Page for S-Tec System 30 Autopilot Its some sort of exercise routine. I made a "connector" pigtail I could plug into the servo and could put 12V and run the motor in each direction for a minute or 2. It took about 3.5 volts to start, which is out of spec. A new or yellow taggedservo also has to be "approved" for your STC by Genesis (read: pay a vig) if I am not mistaken, at least that was the case when I *thought* I had a bad servo until I learned of the clean the armature trick. That and their refusal to certify the Mooney for the 3100 and I'm for one, not interested in doing business with them. "Engage altitude hold mode. You may also want to consider cost of an STec in purchase price of a plane. On 7/10/2020 at 5:55 PM, mike_elliott said: the connector between the pressure switch and the control module andpainted the contacts with Stabilant 22. I have 55X and about a year ago my airplane started oscillating in level flight with the alt. Hey there Russell. It turned out the pitch servo needed be overhauled. D connector that has 4 pins connected. You will need a sub min. or go right to where you really want to be, and get a Bonanza. This thread is locked. Tug002 Senior Master Sergeant Posts: 2249 Joined: 25 Oct 2013 Location: Ontario, Canada. It basically means you have to go over all connectors and wiring first and look for anything loose. Quote; Link to comment Share on other sites. While shopping, I stumbled on usedS-Tec 30 and S-Tec 55X and started inquiring about the conversion to fit my airplane. Harness routing, installation of the brackets, doublers, the servos, then the connections to the control cables plus calibration and paint touch-up. Mine has been real nice so far. By So I took the plane up for a little cross country for the holiday and out of no where the altitude hold on my STEC 30 autopilot would not hold altitude. Included. The gizmo is about 1.5 round and an inch thick. July 10, 2020 in Avionics/Panel Discussion. You are probably right, but I was not going to argue about it as the entire job was flat-rated as a fly away cost. I had to replace my roll servo last year and Stec didnt have any in stock, it took at least a month to get and it wasnt to much fun to replace either. Yet another reason Im installing a TruTrak when able.
Can You Afford NOT To Install A New Autopilot In Your Used Plane? Heres the curious behaviour and I wonder where (i.e. I cant remember the pinouts right off.
Two-axis autopilot combining Altitude Hold with the roll axis function of the System 20. They tightened it up and all was good. But unfortunately I don't think it makes sense to install it after the fact. If you see a plane that is in excellent condition other than a non-working C-III and the price reflects that, you could install the one you want. I'm may be looking at well over 2amu to go down this road. hold only from 182Q 28v system ready to install, ad your existing 300, etc works great Contact Joe Armbruster AIRCRAFT BY ARMBRUSTER LLC , - located Amherst, OH 44001 United States Telephone: 440-320-6726 Posted June 19, 2023 Show all Ads posted by this Advertis. Its some sort of exercise routine. The transducer would than call for up or down pitch from the servo to hold the assigned altitude. Email a friend SYSTEM 30 Brochure / Manual Info Features Included The System Thirty is a two-axis roll stabilization and altitude hold autopilot that requires zero additional panel space. Audible alert is squelched". Since it is most likely the Roll Steering computer, I will initially swap this out with a replacement (it has to be correctly strapped for the NSD-1000/STEC 30. Pasted as rich text. Return to Piper Comanche 250 Tech Support, Users browsing this forum: No registered users and 0 guests.
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