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Flying WAAS GPS Approaches

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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.

GAMI Gains STC for G100UL, Unleaded Avgas

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For years, there has been clamoring for airplanes to get rid of lead in piston engine Avgas. In the early 2000s, Thielert created a Jet A burning piston engine for Diamond Aircraft that gained some traction, but Thielert had internal issues and ended up declaring bankruptcy. Several other Jet A piston engines have come down the line since then to some success (Diamond is currently using 2 Austro manufactured Jet A piston engines on it’s DA62 and a Continental manufactured Jet piston on the new DA50).

The problem with a Jet A burning piston engine, though, is that those engines would be very expensive to put on existing airplanes, not to mention the cost of the STC alone.

Insert GAMI (General Aviation Modifications, Inc.), the famed Ada, Oklahoma company that championed turbo normalization, balanced injectors, and lean of peak operations. For those that have been to GAMI’s engine class, you know that these guys are at the very top of their game in engine knowledge.

In 2010, GAMI started the process of creating an Unleaded form of Avgas, terming it G100UL (the irony of traditional Avgas, 100LL, is the LL starts for low lead, but the lead levels in 100LL are actually quite high. UL stands for UnLeaded). Just before Osh Kosh in 2021, GAMI revealed that it’s work has come to fruition, gaining an STC for G100UL for Lycoming powered Cessna 172s.

The amazing thing about GAMI’s product is that it is able to mix with 100LL and not cause any issues. This means fuel trucks, fuel lines, fuel pumps, and aircraft fuel tanks don’t have to have any modifications to them to use G100UL. Plus, pilots will see longer engine life using G100UL because of the simple elimination of the lead. In tests, combustion chambers in cylinders burned cleaner, so theoretically, cylinders and engines will last a lot longer.

According to the company, GAMI has a few more tests to run and, assuming those go well, G100UL will be available for a whole lot more airplanes. An STC will still be required for the use of G100UL in a specific airplane, but the hope is, eventually, 100LL will be completely replaced by G100UL. The only downside is that G100UL is expected to cost about $1/gallon more than 100LL.

GAMI has partnered with Avfuel, so expect to see 100UL showing up at all Avfuel FBOs in the next year or two.

To read more, check out the press release on AOPA’s website.

Avidyne Vantage

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For years, Cirrus owners who have the Avidyne Entegra PFD and MFD have been clamoring for Avidyne to come up with some sort of upgrade. The Entegra, or EX 5000 system, is late ’90s technology and, though it still works, there will be a certain point in the future when it gives up the ghost. Avidyne still supports the Entegra system, but it’s hard for a Cirrus owner to see all this new technology coming on the market while not being able to upgrade the original Avidyne screens.

Avidyne gave it a go in the late 2000s with a panel upgrade known as the R9. The R9 was a good system, but Avidyne was very slow on the release (rumors were the company wanted it to be absolutely perfect before releasing it, which frustrated Cirrus, who then switched to the Garmin Perspective panel, leaving Avidyne behind) which led to the R9 only being available as a very expensive retrofit to the Entegra system ($80,000-$90,000 for the system and install). Needless to say, there weren’t that many takers.

Late in 2020, Garmin announced it had received certification to retrofit Avidyne Entegra equipped Cirrus Aircraft with the company’s G500 TXi displays, which gave new hope to G1, G2, and G3 Cirrus owners. The price tag wasn’t outrageous, coming in at $16,000 apiece for each display. The G500 TXi works with any possible GPS that can be installed in a Cirrus (GNS 430Ws, GTN 650s, GTN750, or the Avidyne IFD 540/440) and with the DFC 90 Autopilot (if the Cirrus is still equipped with an STEC 55x, the Autopilot would need to be changed to either a DFC 90 or a Garmin GFC 500).

Fast forward to June of 2021 and Avidyne re-enters the game with the Avidyne Vantage. After the R9 debacle, Avidyne has opted this time to go for a more simple approach. The Avidyne Vantage system changes out the Entegra PFD and MFD with bigger screens (12″; Garmin’s TXi units are only 10.6″) with high quality pixelation, synthetic vision, engine gauges, checklists, charts, a hybrid touch interface, and all the other information that was offered on the Entegra system, just all more modern and updated. The best news is that the system provides redundant reversionary mode, which was one of the biggest complaints about the Entegra system.

The price tag comes in lower than Garmin, with each screen being priced at $12,500. The units will work seamlessly with the Avidyne IFD Series GPS units, though, as of this writing, it isn’t clear if the Avidyne Vantage will work with Garmin GTN 430Ws or the GTN 750/650. I would assume that the integration would be there, but I haven’t found any documentation stating that yet. DFC 90 Autopilot integration would be seamless, but not sure the integration with the STEC 55x or Garmin GFC 500.

Avidyne says the Vantage will be fully certified in early 2022, but the company is taking orders now. Visit the Avidyne Website for more information.

Casey Aviation Makes Piper PA46 Systems Videos Free

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The safest pilots are the ones who attempt to gain as much knowledge and learning about their airplane and environment as possible. These pilots are the ones who enjoy learning, going to seminars and conventions, and soak up all the MMOPA magazine articles in each issue. These pilots are the ones who get as much training as they can, above and beyond what the minimum requirements are.

If you are one of these pilots and you own a Piper PA46, then this blog is for you.

Casey Aviation, one of the best Piper PA46 training companies out there, recently released all of their Malibu, Mirage, Matrix, Meridian, and JetProp systems training videos for free. These are some fantastic videos that Casey Aviation created which go much more in depth than any power point presentation could.

The great thing about the videos is they give the viewer an all access “inside look” to the specific airplane. Joe Casey, owner of Casey Aviation, takes off cowlings, crawls under the nose gear compartment, and even shows an airplane with the interior out so all the flap cables and environmental systems can be seen.

I have started referring all of my PA46 customers to the Casey Aviation videos as part of the prep work for our training sessions.

To access the videos, check out the Casey Aviation website.

Chuck’s Aircraft 10 Year Anniversary Fly In

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Chuck’s Aircraft, the Austin Cirrus Service Center located at the Austin Executive Airport (KEDC), is celebrating it’s 10 year anniversary this month. What better what to celebrate than to fly in for Texas BBQ? That’s what they thought too!

Chuck’s Aircraft will be hosting its 10 Year Anniversary Fly In on Friday, June 25th from 1pm to 5pm on their ramp at EDC (see airport diagram below). Chuck’s Aircraft always provides quality maintenance for Cirrus and other aircraft, so come show your appreciation for them.

Please RSVP to erin@chucksaircraftllc.com. Hope to see you there!!!

Chuck’s Aircraft is the hangar circled in green