The Avidyne Equipped Cirrus Upgrade

ByHank Gibson October 27, 2020October 27, 2020

A History Lesson

11 years ago, in April of 2009, the Avidyne Corporation unveiled the much bally-hooed Release 9, or R9 as it is commonly known, as a hardware replacement for the Avidyne EX5000 Entegra system in Cirrus Aircraft. The Entegra system was way outdated by that point. Even though Avidyne was the first company to put together a glass PFD in a single engine piston airplane, the company had quickly fallen behind Garmin in keeping up with the ever changing technology landscape.

Rewind to 2008. Cirrus had been going strong with the Avidyne Entegra since the SR20 and SR22 went to full glass in 2003 (a PFD and an MFD; prior to that, Cirrus aircraft only had an MFD with steam gauges and a Sandel Electronic HSI). Cessna, on the other hand, vaulted past the Avidyne Entegra and went straight to the Garmin G1000 in it’s aircraft, starting in 2004 with the 182 G1000 and 2005 with the 172 G1000. Beechcraft and Columbia went to the G1000 (Columbia started with the Avidyne as well) in 2005.

Garmin’s technology in 2007 was so much better than Avidyne’s technology that Cirrus decided to switch. I’m sure there were many promises made by Avidyne to Cirrus about what Avidyne was working on (the R9), but the G1000 was out there, available, and being used in a lot of different airplanes with very good results.

So, in 2008, Cirrus made the switch from the Avidyne Entegra to the Garmin G1000, dubbing it the Cirrus Perspective by Garmin avionics package. Avidyne finally got the R9 to market in 2009, but by that time, Piper was the only airplane manufacturer left putting factory Avidyne panels in their airplanes, and they switched to G1000 later that year.

The R9 is a fabulous product. It’s fully integrated, has great graphics, has fully redundant displays, a QWERTY keypad (which, by the way, Garmin didn’t do for another 8 years), and a lot of other neat features. There’s a bit of a learning curve, but it’s a really good product for what it is.

Avidyne, though, was late to the game with their technology. By the time it debuted in 2009, all the GA aircraft manufacturers had long since switched to the Garmin G1000 and weren’t looking back. That left Avidyne with the retrofit market for the many different Avidyne Entegra Cirrus aircraft out there. The only problem was, the retrofit was $80,000 ($95,000 if you wanted to throw in the DFC 100 Autopilot, which is a must have) and not many owners were up for paying that much money, then or now.

To sum up our brief history lesson, Avidyne knew the Entegra needed to go, but couldn’t get the R9 out quickly enough to convince anyone to stick with Avidyne products. The retrofit market didn’t amount to many sales, so Avidyne doesn’t even make the R9 anymore.

As a side note, I really, really like the Avidyne R9 and am sad that it didn’t make it into more airplanes.

So, when the Avidyne Entegra starts to have issues, what’s an owner to do? Keep reading!

There is Hope

There are thousands of Cirrus aircraft out there flying with the Avidyne Entegra instrumentation, which is basically 20 year old technology (I’ve had a computer engineer tell me the programming in an Entegra is Windows 98 tech). These things are going to start having problems at some point (many already have), but what solution do owners have that is cost effective and get’s them new technology?

Remember that little company named Garmin? Well, they have come through again. Announced this summer, the Garmin G500 TXi is now certified as a replacement in the Cirrus Avidyne Entegra equipped aircraft. This means pulling out both the PFD and MFD and replacing them with the G500 TXi on both sides. Engine data is also displayed on the G500TXi MFD, including the percent power and TIT indications, if equipped.

Cirrus SR22 Equipped with Dual G500 TXi Screens and Dual Garmin GTN 650Xi GPS Units

The cost for the panel? Two 10.6″ G500 TXi’s run about $16,000 apiece for the units, not including labor. $32,000 for a brand new panel isn’t terrible. Plus, the G500 TXi’s work with the DFC90 autopilot if the Cirrus is already equipped with it. If not, the Garmin GFC 500 autopilot is now approved for the Cirrus at a relatively low price of $7,000, including the servos.

Still have the original Garmin 430s in your Cirrus? Upgraded to the Avidyne IFD 540/440 stack? Put in dual GTN 650Xi’s? Put in a GTN 750Xi? All are compatible with the G500 TXi panel.

Want to upgrade everything? It does get kind of pricey at that point, but for just equipment, the cost for a complete panel conversion is somewhere in the area of $65,000 plus labor, still below what the R9 cost, but not cheap either. That would include 2 G500 TXi’s, 2 GTN 650Xi’s, a GFC 500 Autopilot, and all the engine monitoring equipment that the G500 TXi would need.

Cirrus SR22 Equipped with Dual G500 TXi Screens, a GTN 750Xi, and a GTN 650Xi

Thankfully, some new technology has finally come to the Generation 1-3 Cirrus. Oh, and by the way, your steam gauge Cirrus is fully upgradable as well.

Want to read more? Check out Garmin’s website.

Breathing…It’s The Difference in Engine Performance
ByJoe Casey November 27, 2018November 27, 2018

The PT6 engine that’s found on the Jetprop and Meridian is designated a -21, -34,-35, or a -42A. The Continental engine on a Malibu is either a TSIO 520 or a 550. What’s the difference? Why should I care? Most pilots don’t understand the difference, but it’s pretty easy to understand…and it’s all about breathing.

Whether a piston or a turbine, the engine has a ratio of fuel/air that works best. For a piston model, we can make adjustments to this ratio by adjusting the mixture. In climb we use a richer ratio to help cool the engine, and in cruise we lean the mixture to save fuel since we don’t need the extra fuel for cooling (due to higher speeds which cools the engine). In the turbine, the ratio is set and there’s nothing that can be done about it…except climb to a higher altitude. But, more about that in a second..let’s go back to the piston discussion…

Piston: A Continental 520 engine and the 550 engine are flown exactly the same. On takeoff, both will develop 310HP (38″MP with the 520, 35.5″MP with the 550). So, why would a pilot want a 550 in his airplane as opposed to a 520? The answer is breathing.

A 520 is named appropriately because the engine displaces 520 cubic inches of air with each complete cycle of all 6 cylinders. To determine the displacement, just figure the bore (diameter of the cylinder) and the Stroke (how far the piston travels in the cylinder) and plug the numbers into this formula:

CID = Bore X Bore X 0.8754 X Stroke X # of Cyl.

Here’s the bore and stroke of the Continental 520 and 550 engine:

TSIO 520: Bore = 5.25″ and Stroke = 4″
TSIO 550: Bore = 5.25″ and Stroke = 4.25″

So, you can see the two engines are exactly the same except the 550 has a little longer stroke, and therefore displaces a little more air. Said another way…it the sucks the air into the engine a little better.

So, with this knowledge, the ability for the engine to breathe becomes a little more clear. Both a 520 and a 550 will perform exactly the same until the point that a 520 simply cannot suck enough air and begins to develop less MP as a result. For most 520 engines, this will happen somewhere around 18,000 ft. But, it is dependent upon a myriad of factors including: health of the engine, altitude, temperature, and atmospheric pressure. When the 520 hits this point, the throttle can be full-forward, but the engine will not develop full MP, but some number that is less. I’ve seen a max MP at FL250 in a 520 Malibu to be about 31″MP. So, you can probably guess that the rate of climb will correspondingly suffer as the engine develops less MP. How do we fix this problem? Enter the 550…

Since the 550 displaces more air, the engine will maintain max MP to a higher altitude. When the 520 begins to develop less power at about FL180, the 550 engine will be able to continue to maintain 35″ at a higher altitude. Make no mistake…the 550 will also hit an altitude where is cannot develop 35″MP, but this altitude will probably be nearly FL220. So, the 550-powered Malibu will reach cruising altitude faster than the 520.

But, at cruise both engines are pulled back to 30″MP. So, either engine will deliver the same cruise speed because they are both able to develop 30″MP at any altitude. Does it really matter if you’ve got a 520 or a 550 engine? Answer: not much. Both are excellent engines and both will deliver the airplane to the destination, but if the chosen altitude is above FL180, the 550-powered airframe will probably arrive a few minutes earlier. Which would I want if I were purchasing an airplane? It’s not a big enough deal, IMHO. I’d select the best airframe/engine/prop combination and not put much weight into the 520 vs. the 550.

Turbine world: So, how about the -21, -34/35, and -42A compare? Here, there’s big difference, but it’s still all about the breathing. A -21, -34/35, and -42A are all derivatives of the famous PT6 family of engines, and all are designed to be 1000+SHP engines de-rated to fit the airframe. For instance, the -42A engine is 750SHP when mounted on a King Air 200, but the same engine is derated to 500SHP when mounted on the Meridian. Ditto with the -21 and -34/35 engines…all are de-rated. So what’s the difference? Breathing…

At the lower altitudes all will develop their maximum rated SHP, meaning they will all develop maximum torque. And, down low there’s plenty of air to breathe so the engine has no problem developing that torque at a low ITT. But, as altitude is gained, the engine must suck more air to develop the same torque, and the ITT goes up. At some point in the climb (depending upon altitude, temperature, pressure, and IAS) the engine will not be able to produce max torque without exceeding Max ITT. At this point, the engine cannot breathe any more (suck in anymore air), and the power (torque) developed falls off. With the -21 engine, the power falls off quite dramatically because the engine simply cannot breathe well. It is a smaller engine and more air cannot be forced into the compressor section. For the rest of the climb the engine is “ITT limited” and the performance will suffer.

The -34/35 engine is a little bigger and will develop maximum power (torque) to a higher altitude. And, when the torque does drop off (as altitude is increased), the rate of decrease is less because it can breathe easier due to it’s larger size. Guess what? The -42A will beat out the others and develop max torque to an even higher altitude. With this decrease in torque available also comes a welcome friend…less fuel burn. Altitude is the friend of any turbine pilot, and he/she will climb to the highest altitude possible to save on fuel.

The end result is the -21 powered Jetprop will cruise at 238 KTAS (in the summer) with a fuel burn of only 28gph. The -34 will have higher torque than the -21 and will develop more SHP and will have a higher cruise (260 KTAS in the summer) with a correspondingly higher fuel burn (32gph). The -42A will be breathing easily at higher altitudes, and will develop the most torque, but with a fuel flow of 39gph. The Meridian (with the -42A) will not out-perform the -34/35 Jetprop in cruise purely because the Meridian is much heavier.

Just remember…fuel flow in a turbine is always commensurate with its ability to breathe and a turbine’s ability to breathe is a function of the engine’s ability to breathe.

With this knowledge…let’s check your understanding. Answer this question: Will a Jetprop cruise faster in the summer or winter? Remember, cold air is more dense than warm air, and an engine will develop power according to it’s ability to suck in air. More air available, more power available. Answer: Winter.

A good analogy: I’m a Cross-fitter (meaning I do crossfit workouts a lot). In the gym we have various workouts that test a person’s ability to perform. Guess who usually does the best? Right…the guy who can breathe the best. A person is nothing more than an engine…we intake air and combine it fuel and burn it to develop energy. In Crossfit, the person with the biggest engine (muscles that can develop power) that can sustain power (good aerobic capability) will win almost every time. The only variables then are genetics (how well-made is the engine), flexibility (you’ve got to be able to get into the position), and skills (there are more efficient movements). A good Crossfitter will work hard on mobility, skill, and try to increase the bodies ability to increase capacity through a tough workout.

To get maximum performance, the pilot cannot change the engines skill or mobility (at least not without an engine change!), but a thorough understanding of the how the engine breathes will help him/her use the power that is available to the fullest.

Joe Casey’s aviation story began in 1990 with his first flight near Nacogdoches, TX in a Cessna 172. From lift-off, Joe knew he would have a lifetime passion flying just about anything that will leave the ground…He was completely hooked.

Along with being an FAA Designated Pilot Examiner (DPE), Joe is an ATP/CFI-AHMG and Commercial Rotorcraft/Glider Pilot in the civilian world and also a UH-60/AH-64 Pilot-in-Command/Instructor/Examiner Pilot in the US Army Reserves. His passion for the last 19 years, however, has been the PA-46 Malibu/Mirage/Matrix/Jetprop/Meridian. Has has amassed over 6,500 hours in various PA-46 airframes and believe it to be one of the finest flying machines available for the serious cross-country pilot with an eye for efficiency.

Now, Joe has flown more than 12,200 hours in just about every imaginable environment. Whether providing initial/recurrent training in the PA-46’s, TBM’s, instructing in NVG’s in a UH-60 Blackhawk, flying the King Air series of airplanes, giving tailwheel endorsements, or taking kids flying for the first time, he simply loves flying machines and the people who fly them.
New Houston Airspace Procedures
ByHank Gibson May 29, 2014

If you are based in Houston, or heading into or out of the Houston airspace under IFR, have you updated your charts? If not, you may hear a clearance stating: “N67889, cleared to Amarillo via the BORRN 1 Departure, CRGER Transition, Direct. Climb via the departure, expect 8000 in 10 minutes. Departure frequency 123.8, Squawk 3365.” You manage to get the clearance written down, but have completely messed up the spelling of both BORRN and CRGER, so you have no idea where the intersections are. After stumbling through a readback, you ask ground to spell the fixes for you.

Then, more bad news. You haven’t updated your GPS cards yet, so the departure isn’t in your 430. It’s an RNAV only departure, so you can’t fly it based on the NAV Radio. You were planning on updating your iPad when you got to Amarillo, so you don’t have the departure on there, either.

This has probably already happened to a few people today already.

Houston airspace got a major overhaul today. There are 20 new DPs and 29 new STARs guiding IFR traffic into and out of Houston airspace (including one named the DOOBI 1 Arrival, named after the Dooby Brothers band).

The FAA’s goal in all these changes, according to AOPA, is to “bring fuel efficiencies, time efficiencies, and reduce carbon emissions” (from Benet J. Wilson’s May 15th article on AOPA.com). The FAA issued a NOTAM today valid until June 6th describing what routes for pilots to file. The NOTAM also contains contingency plans for pilots flying without updated charts (like our example above).

Pilots should expect these wide scale procedure additions and changes to start showing up in other Class B airspace across the country. As always, make sure those charts are updated, GPS databases are current, and you do some studying of your route before you file your flight plan.
Flying WAAS GPS Approaches
ByHank Gibson August 30, 2021August 30, 2021

When flying a WAAS GPS approach, there are several different levels of WAAS signal that a GPS receiver can get. The most precise is an LPV signal. LPV stands for Localizer Performance with Vertical guidance. An LPV approach has the lowest minimums of all the WAAS GPS approaches, typically in the range of 200-300 feet AGL. A GPS glide path (GP) is guaranteed with an LPV approach and the minimum altitude is a decision altitude (DA).

Just like a localizer, an LPV course width get’s tighter and the CDI becomes more sensitive the closer the plane get’s to the runway. Even though the LPV approach minimums are so low and the approach is down to a DA, they still aren’t considered precision approaches by the FAA (which leads to some extra planning when selecting an airport as an alternate that only has GPS approaches, since the AIM specifies only the LNAV minimum are to be considered if an alternate airport only has GPS approaches, bringing the 800 foot ceiling requirement to bear)

An LNAV/VNAV approach is still a WAAS approach that has a GPS glidepath, but is slightly different than an LPV approach. An LNAV/VNAV final approach course does not get more sensitive the closer the plane gets to the runway. The smallest course width on an LNAV/VNAV approach is 0.3 miles either side of center. LNAV/VNAV approaches will, most of the time, have higher minimums than LPV approaches and can have minimums no lower than 250′ AGL.

The third type of WAAS approach is strictly a non-precision approach with a Minimum Descent Altitude (MDA). These are designated LP approaches, which stands for Localizer Performance. These are like old school Localizer only approaches that, similar to the lateral portion of an LPV approach, the course width tightens the closer to the runway that a pilot is. There is no glide path by definition of an LP approach, though there is a caveat.

Now, by looking at an approach plate that is a WAAS approach, but only has LP minimums listed, a pilot would assume there would be no glide path. Depending on what type of GPS unit the airplane has, that pilot could be wrong. Garmin Perspective units (Cirrus G1000), all GTN 750s and GTN 650s, All G1000 NXi units, most Garmin 430W and 530W, and all Avidyne IFD 550/540 and 440 units will display an advisory glide path on an LP approach, designated LP+V.

What does LP+V indicate? An advisory glide path is just advisory, but it is totally legal to follow down on a non-precision LP approach. The kicker is obstacle clearance is not guaranteed and the pilot needs to keep an eye on minimum altitudes at the different waypoints on the approach. The big thing I tell people is, when you arrive at the MDA and the runway is in sight, following the advisory glide path below the MDA could get you in trouble with obstacles. Don’t just hone in on your instruments when you break out of the clouds. Look out the windscreen and make sure you won’t hit anything.

If you arrive at the MDA on the advisory glide path and the runway isn’t in sight, DON’T GO BELOW THE MDA! Most autopilots won’t level off at the MDA, even if that altitude is set in the altitude pre-select, so this will involve turning off the autopilot before the MDA and manually leveling off, or engaging the altitude mode of your autopilot at the MDA.

One other type of GPS approach that you will encounter is an LNAV approach. This is a non-WAAS approach down to an MDA, but your GPS unit may still give you a +V. Most modern ones will.
2024 Texas Top Aviation Shangri-La Fly In
ByHank Gibson January 15, 2024May 7, 2024

It’s that time of year again! Yes, it’s the New Year, but it’s also time to register for the 2024 Texas Top Aviation Fly In. The Aviator’s Academy’s sister company, Texas Top Aviation, is hosting it’s 4th annual fly in event on March 19th-22nd, 2024 at the Shangri-La Resort in Grand Lake, OK.

For those not familiar with the annual Texas Top Aviation Fly In, we’ve been hosting this event since 2019 and it is always well attended and fills up fast. Geared around aviation education, golf, community, and a whole lot of fun, the fly in is always very popular.

This year, we are adding a Par 3 Shootout for early arrivals on Tuesday, March 19th at the Shangri-La’s Battlefield Par 3 Course. The 4th Annual 2 Round Golf Tournament begins on the afternoon of Wednesday, March 20th and finishes up on the afternoon of Thursday, March 21st.

The biggest hit of the week is always the safety seminars on Thursday morning. This year, Texas Top Aviation has secured the talents of Paul New, expert Cirrus, Columbia, and Cessna mechanic, and owner of Tennessee Aircraft services. If you listen to Mike Busch’s podcast, Paul is a regular. Scott Williams, owner of The General Aviation Law Firm, will be presenting on LLC’s and Illegal Charters, while Hank Gibson, owner of Texas Top Aviation and The Aviator’s Academy, will present a study on several different accidents and what can be learned from other’s mistakes.

It’s guaranteed to be a fun week. The Grove Regional Airport in Grove, OK will be our host airport (KGMJ) this year. Sign up soon as space is limited. Registration is only open till February 23rd, 2024. For more information and to register, simply Click Here. We hope to see you there!
The Glass Panel Cockpit Seminar
ByHank Gibson September 10, 2014September 16, 2014

Have you looked longingly at the Aspen PFD or Garmin G500, imagining those beautiful glass panels set in your airplane? Think it’s too advanced for your flying skills? Well, think again! Hank Gibson of Texas Top Aviation will be hosting a seminar at the Redbird Skyport FBO at the San Marcos Airport (KHYI) on Thursday, September 25th at 7pm to enlighten everyone on all the different glass panel and modern GPS options out there.

No panel is too complex! No GPS is too complicated! Come hear about how you can upgrade your steam gauge airplane to a modern, glass panel cockpit that will be the envy of all your pilot buddies.

The seminar begins at 7pm in the large conference room at the Redbird Skyport. Come see this beautiful facility which hosted the AOPA Fly In this past April. There will be two drawings for free flight training in your airplane, so make sure you get your entry in once you arrive. WINGS credit will also be given.

Redbird welcomes pilots flying in for the event. If you are flying in, please show your support for Redbird by purchasing fuel!

Signup is required for the event. To sign up, please click here.

We hope to see you there!!!
Aircraft Purchase: The Logbook & Pre-Purchase Inspections
ByHank Gibson July 10, 2014July 14, 2026

Your about to make your dream aircraft purchase. The plane has low time on the engine, is reasonably priced, and, according to the seller, has no damage history. You are overjoyed! Your dream of making an aircraft purchase is finally coming true. You prepare your offer for the seller, set up the escrow account, and start all the paperwork.

Two weeks later, the airplane is yours! You start flying it, though, and the engine starts to have some strange vibrations. After several flights, it starts to get worse. You take it to your mechanic to get it looked at and you find out the airplane needs three new cylinders along with some other engine work that is going to total a lot of money. Plus, your airplane is now going to be in the shop for several weeks.

All that excitement you just had? It just went out the window.

Could this have been prevented? Probably so, with a logbook inspection and a pre-purchase inspection.

Aircraft Purchase: Logbook Inspection

Inspecting a logbook can be very daunting when making an aircraft purchase, especially for older airplanes. This is, however, one of the most vital steps in making a new aircraft purchase. You can find out many things from looking at the maintenance logs of an airplane. First, you can check the compression levels of the engine. Typically, you want compression levels in the 70’s, with it still being okay in the high 60’s. Anything below 65 and there could be potential problems.

Second, you can find out if there has been any odd maintenance done pointing to possible unreported damage history. This is rare, as most aircraft owners are honest and up front when talking about damage history. But, if there is an entry detailing a prop overhaul after only 50 hours on that prop, you may start to ask some questions.

Third, you can find out how well the airplane has been maintained. If a lot of maintenance was completed at each annual, even if it was a lot of small things, then the airplane has been maintained by a good mechanic who is very thorough. This also involves a check of the ADs, Mandatory SBs, SBs, and SLs that have been issued for the airplane. If all that has been kept up with, it’s a well maintained airplane.

Finally, it gives you a good idea of how much the airplane has been flown. Sure, the ad online will have the total time and time since overhaul, but you can look at the year by year breakdown of how much the airplane has been flown. It may have been flown a lot earlier in it’s life, but not quite as much recently. That’s not necessarily a bad thing, but airplanes like to be flown.

Aircraft Purchase: Pre-Purchase Inspection

Before making an aircraft purchase, it is extremely vital that whenever you are buying an airplane that you get a pre-purchase inspection done on the airplane. Even better is getting one done by a mechanic who specializes in that type of airplane (eg. Piper Service Center for Pipers, Cirrus Service Centers for Cirrus, Kevin Mead for PA-46s). A pre-purchase inspection can save you a lot of money in the end.

There is always going to be some kind of maintenance issue with an airplane being purchased, whether it is big or small. Once a pre-purchase inspection is completed, you can take the findings to the seller and negotiate for a lower price based on those findings, or just have the seller fix the items before the sale is completed.

I would recommend having the seller fix the problems before the sale is completed. Even though it may take a little longer for the sale to be completed this way, you’ll get to enjoy your airplane right away instead of it being in the shop the next several weeks after you complete the purchase.

There is the circumstance where the pre-purchase inspection reveals some serious airworthiness issues which would cause the deal to be voided. Always put this clause in a purchase agreement, giving you, the buyer, an out if there are serious airworthiness issues.

When it comes to making an aircraft purchase, it is not a process to be rushed. Slow and steady usually gets the best airplane for the money, giving you years of enjoyment in the future.

Looking to make an aircraft purchase? Daunted by all the work that’s involved to find a good, quality airplane? Let Texas Top Aviation do your aircraft search for you! To learn more, visit Texas Top Aviation’s Aircraft Purchase Consultations page.