The 2020 Texas Top Aviation Santa Fe Golf Fly In has been re-scheduled due to the COVID-19 pandemic and quarantine. The new date is September 3rd-5th at the Santa Fe Buffalo Thunder Resort and Towa Golf Club.
For more information on the event and to register, please click here.
When a pilot first glances at the title of this article, the first thought that probably goes through that pilot’s head is, well that’s easy.
And it is, if you are flying a high wing Cessna. On other airplanes, there are a few tricks to checking the stall warning horn. If you get them wrong, you’re liable to get a bill from your maintenance shop for an hour of labor for a problem they couldn’t duplicate.
Cirrus SR22
Let’s start with the Cirrus. On the pre-FIKI Cirrus aircraft, there was a small little hole in the wing that contained a diaphragm. That diaphragm sensed a change in airflow at a certain angle of attack just below the critical angle of attack and set off the stall warning horn. Unfortunately, the only way to check that is to suck on the hole during pre-flight.
I don’t. I verify the hole is clear and that’s about it.
On the FIKI Cirrus aircraft, there is actually a stall warning vane. It looks like a high wing Cessna vane, but if you turn the batteries on and try and get it to come on during your light and pitot heat check, nada.
Here’s the trick, and the checklist doesn’t do a good job of describing this.
The speaker and the Avionics Master are so you can actually hear the horn (if you had the headset on while you were doing this, the speaker would be unnecessary). The flaps have to be full because the pitch attitude for the critical angle of attack is lower with the flaps down, so the horn goes off when at a different angle. You then don’t have to use as much force to push the vane.
Piper PA46
The early -310P Malibus are pretty simple and straight forward. Move the vane, get the horn.
In the -350P, you can’t get the horn to come on by moving the vane. So, Piper put a stall test button that’s hidden underneath the upper left side of the instrument panel. Push that to test the horn. On the G1000 PA46, it is located directly above the PFD. On the Avidyne, it’s below and to the left of the pilot’s yoke.
Testing the stall warning horn is a very important part of pre-flight. A pilot needs to know if the aircraft is close to a stall. The advent of Angle of Attack indicators in small, GA aircraft, have added a greater awareness to the angle of attack during all phases of flight to avoid those stall spins.
If the stall warning horn goes off or the AOA shows yellow, lower that nose immediately.
In the fall of 2021, Garmin announced the long awaited confirmation that the Garmin GFC 600 autopilot is now certified for the Piper Meridian. The Garmin GFC 600 autopilot has been certified for all other types of the Piper PA46 line of aircraft, but the Meridian was last in line. The airplane has to have been manufactured prior to 2009 and have Avidyne avionics, Meggitt, or have been retrofitted with a Garmin G500 (no G1000 aircraft since those already have the GFC 700 autopilot).
The Garmin GFC 600 autopilot is the ultimate digital autopilot. The integration with the Garmin G500, GTN 750 and GTN 650 units is a beautiful thing. The autopilot communicates with all the heading and altitude bugs, flies approaches smoothly, and even has a level button.
In the latest technological marvel from Garmin, Garmin Safe Glide, the GFC 600 autopilot is critical in reducing pilot workload in an engine failure situation. It flies the airplane for you and takes you to the nearest airport, reducing the stress and allowing the pilot to troubleshoot the situation.
Texas Top Aviation recommends Abilene Aero in Abilene, Texas for any and all avionics installs. They have worked with several of our customers in the last year, are extremely knowledgable and do excellent work. Call them for a quote on a new Garmin GFC 600 autopilot in your Piper Meridian.
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.
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!!!
We have all been hearing about the HondaJet for quite a while now. It’s been in testing for a number of years, but it sounds like certification and deliveries will commence early in 2015. Honda says they expect FAA certification in the first part of 2015 and deliveries will commence soon thereafter.
For those of you in the San Antonio area, if you’d like to get a glimpse of the first production HondaJet, it will be at Landmark Aviation at KSAT on Wednesday, October 29th. Cutter Aviation is hosting the event, as they will handle the regional sales for Honda. No flights will be conducted, but folks are welcome to walk around the airplane, climb inside, and give it a good once over.
For those planning on attending, RSVP is required. Contact Lisa Harris at Cutter to RSVP either by phone (602-267-4054) or by email (lharris@cutteraviation.com). Drinks and snacks will be served. The event runs from 5:30pm-8:00pm.
As was the case with the Class B Airspace around Houston several months ago, the Class B Dallas airspace has been overhauled as well. These changes were implemented at the last database update on September 18th. If you’ll be flying into any of the Dallas airspace airports IFR, make sure you have current charts and your GPS databases are updated.
According to AOPA, 14 SIDs and STARs were deleted, a number of new procedures were added, and changes were made to most of the other remaining procedures. The new procedures in the Dallas airspace consist mainly of RNAV procedures for turboprops and jets, so most GA aircraft won’t be affected by those. The legacy procedures that remained in place over went changes, including new frequencies, so piston aircraft going into the Dallas airspace are still affected.
From AOPA, departures from Dallas Love (KDAL) that file their flight plan with special equipment /G in their flight plan will automatically be given an RNAV departure procedure. This does not appear to affect piston aircraft as all the new RNAV SIDs in the Dallas airspace are for turboprops or turbojets.
The reason for the changes to the Dallas airspace? Similar to the changes in Houston, these airspace changes are meant to streamline departures and arrivals in the Dallas airspace area, reduce controller workload, and give continuous descent angles for arriving high altitude traffic.
Don’t be surprised the next time you are in the Dallas airspace area if you receive a clearance that states: “Descend via the arrival.” In that case, just check the chart and aim for the appropriate altitudes at the appropriate fixes. As we move closer to the ADS-B requirement, I believe we will see more and more of these terminal procedure overhauls, so be prepared and keep those charts and databases up to date.
