Calm Wind Landings

ByHank Gibson

Some of a pilot’s favorite words are heard on the ATIS:  “Winds, Calm.”  These words set off all sorts of happy bells and hallelujah choruses.  Most pilots spend their lives fighting the winds.  On those rare days when the winds are calm, great happiness ensues.

Limp Wind Sock

But, are calm wind landings more complicated then everyone thinks?  Well, they can be if the proper planning doesn’t go into them.

Let’s think about wind.  We have surface wind and we have winds aloft. Sometimes the surface winds are calm.  When this happens, certain airports have preferred calm wind runways which are supposed to be used in these conditions.  Winds aloft are almost never calm.  95% of the time, there is some kind of wind even 100-200 feet above the surface.

Here is the question pilot’s face when coming into an airport with calm winds: which runway do I use?  Do I use the calm wind runway?  Do I use the runway that is easiest to enter the pattern for?  Do I use the one with the shortest taxi?

A lot of technologically advanced aircraft have a wind indicator on the PFD. This tool is often forgotten in calm surface wind conditions.  On the contrary, this is probably the most important tool a pilot can have when figuring out which runway to use when the winds are reported calm.

Here’s why.  That wind indicator is showing the pilot what the winds aloft are. The winds aloft should determine what runway is going to be used.  If the wind indicator is depicting a south wind, then a south runway should be used.  Even if it is a 5 knot wind at pattern altitude, it’ll still be a headwind coming in on final approach.  If the north facing runway is used, that same 5 knot headwind can blow an airplane halfway down the runway before the ground speed drops off enough for it to land.

So, the next time you are coming into an airport and the winds are reported calm, take a look at your wind indicator on your PFD when deciding which runway to use.  It’ll probably save a few go arounds!

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  • Flying WAAS GPS Approaches

    ByHank Gibson

    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.

  • Cirrus G2 Vision Jet

    ByHank Gibson

    Well, that was fast.

    In January, Cirrus announced the Generation 2 SF50 Vision Jet.  After getting the Generation 1 Vision Jet certified in late 2016, Cirrus didn’t waste any time in starting in on improvements.

    The improvements are pretty sweet, making the G2 Vision Jet even easier to fly and step into for Cirrus’ target market, SR22 owners.

    Here are the improvements on the G2 Vision Jet.

    RVSM Approval

    The G2 Vision Jet has received RVSM approval, allowing the airplane to fly at 31,000 feet.  RVSM stands for Reduced Vertical Separation Minimums (read more about RVSM here).  RVSM airspace starts at 28,000 feet, the G1 Vision Jet’s ceiling.  Now that the G2 Vision Jet is RVSM certified, it can fly at 31,000 feet.

    For piston pilots, you are left scratching your head as to the advantage of this.  In a jet, the higher you go, the thinner the air, so the faster you go, and the less fuel you burn since the thin air needs less fuel to mix with.  This caps out at a certain altitude and the speed begins dropping and you start losing efficiency (even though the fuel burn is quite low).

    According to Cirrus, at 31,000 feet, the G2 Vision Jet cruises over 300 KTAS and gets a range boost to almost 1,200 nm.

    Garmin Perspective Touch+

    Cirrus & Garmin have taken the new NXi interface and paired it with the Garmin Perspective Touch to create the Touch+.  You can read about the improvements on the NXi here, all of which are included in the Touch+ in the G2 Vision Jet.

    The big improvement that is included in the Touch+ is Autothrottle capability.  An Autothrottle is integrated with the autopilot.  It automatically adjusts power settings and speeds based on the phase of flight without the pilot having to touch the throttle.  Pretty cool.

    New Cabin

    The G2 Vision Jet has a redesigned cabin as well, making it an extremely passenger friendly airplane.  The second row has been redesigned and equipped with a center console.  There is also a drop down TV screen that allows passengers to connect their mobile devices to it to watch movies or videos while traveling (no internet on board, yet.  That’ll probably be the G3 Vision Jet!).

    Cirrus also put in more noise reduction in the cabin, creating a quieter ride for passengers.  Cirrus also allows for multiple different seating configurations, depending on the needs of the owner.

    As always, Cirrus is on the leading edge of airplane technology, creating airplanes that are easy as well as fun to fly.  I’m excited to see how they continue to improve the design to both the SR22 and the Vision Jet.

  • Flight Training Deemed Essential Business

    ByHank Gibson

    There have been lots of changes in all parts of our lives with the coming of COVID-19. All of our lives have been affected in one way or another. We hope and pray that none of your families have been directly affected by the illness.

    A lot of us have been living under Shelter in Place orders for several weeks now, only going out for groceries and making sure to keep our distance from people. We have to take a different mindset when we go out now. Even meeting new people is different since we can’t shake hands.

    Flying has been an afterthought for a lot of pilots. There have been multiple ATC facilities where controllers have been afflicted with the virus and have had to shut down for hours or days. Airspace can change pretty quickly, going from what we all know as normal, to an ATC-ZERO scenario. This was the case for New York Center several times over the last two weeks.

    There was some uncertainty regarding flight training under the shelter in place orders and Texas Top Aviation has been asked several questions about it over the last week. Yesterday, the Flight School Association of North America (FSANA) announced that flight instruction was indeed an essential business.

    In an article on GeneralAviationNews.com, the website quoted a memorandum of understanding written by attorney George Winton on March 24th. Winton was a senior attorney for the FAA and U.S. Department of Justice, and now operates The Aviation Law Firm in Annapolis, Maryland.

    “This memorandum affirms the statement that…flight training would be included as a critical infrastructure activity. Those engaged in the provision of and receipt of flight training who work to provide enhanced compliance with CDC recommendations for limiting potential COVID-19 exposure and spread would be considered exempt from travel limitations imposed by local authorities.”

    Winton’s memo was sent to the Department of Homeland Security’s Cybersecurity and Infrastructure Security Agency (CISA). In the memo, Winton stated:

    “CISA listed Other Community-Based Government Operations And Essential Functions as follows: Workers who support necessary credentialing, vetting and licensing operations for transportation workers.”

    “The aviation sub-sector stakeholders involved with operation of recreational aircraft and flight schools, who employ Essential Critical Infrastructure Workers from the Transportation Sector, support necessary credentialing, vetting and licensing operations for transportation workers seeking pilot certification by the Federal Aviation Administration. Since CISA intended to be overly inclusive to reflect the diversity of industries, the aviation mode stakeholders understand that essential employees involved with the operation of recreational aircraft and flight schools continue to be identified as Essential Critical Infrastructure Workers from the Transportation Sector. Accordingly, the aviation sub-sector stakeholders who employ Essential Critical Infrastructure Workers from the Transportation Sector will continue to operate recreational aircraft and flight schools, appropriately modified to account for CDC workforce and customer protection guidance, based upon the CISA memorandum dated March 19, 2020.”

    Based on the above guidance, Texas Top Aviation will continue to operate flight training in all of it’s normal capacities, while maintaining vigilance concerning sanitation, cleanliness, and health. Our company will keep it’s customer’s up to date on instructor health and wellness and won’t hesitate to cancel if there is any kind of health concern. We ask our customers to do the same.

    If you are scheduled to train with Texas Top Aviation, please don’t hesitate to contact us with any questions or concerns you might have.

    To read the entire memo from George Winton, you can find it here.

    Concerning the 2020 Texas Top Aviation Santa Fe Golf Fly In scheduled for June 5th-7th, that event is currently being re-scheduled for September 2020. Dates will be announced by the end of April. We look forward to seeing you in Santa Fe in September!

  • An Educational Runup

    ByHank Gibson

    When a pilot thinks of an engine runup in a single engine piston airplane, typically it is let’s find out if the engine is running rough or not, meaning a spark plug is fouled.  Believe it or not, there is a little more to learn from a runup than just checking the spark plugs.

    A distinct advantage to having an engine monitor that monitors all EGTs and CHTs is you get a better idea of engine health.  When switching to one magneto or the other during the runup, all the EGTs should rise, showing that the temperature of the exhaust gas is going up from each cylinder.  This occurs because when running on only one magneto and one set of spark plugs in each cylinder, the mixture takes longer to burn, so, when the exhaust valve in the cylinder opens, the burn is still on going and this hits the EGT probe, causing a temperature rise.  An indication of a magneto failure in flight would be a rise in all the cylinders EGT without a change in mixture setting.

    Now that we know what to look for when checking each magneto, what would one look for to show that there is a problem?  The basic that each student pilot is taught still applies.  The engine manufacturer puts a limit on RPM drop during the runup.  When checking one magneto or the other, watch for an excessive RPM drop.  If the RPM drops past the limit, this usually will be accompanied by engine roughness.

    Why is that?  Let’s look at the cause for the excessive RPM drop.  For this, we need to go back to our EGT indicators.  Let’s say we have a 6 cylinder engine.  When the key is turned to the right magneto, the RPM drops 250 RPM and the engine gets very rough.  Look at the EGT gauge.  The cylinders where the spark plugs are firing normally will all show a temperature.  The cylinder (or cylinders) where there is no combustion, meaning a bad plug, will show no temperature.  This is because the mixture is just sitting in the cylinder and not igniting, therefore, no exhaust gases will be pushed out so there will be no EGT indication for that cylinder.  This is also how you tell a mechanic which cylinder to check for the bad plug.

    It could also be a bad magneto.  If multiple cylinders EGT all drop, or the engine wants to quit entirely, you have a bad magneto or bad ignition harness.

    What else can you learn during the runup?  Electrical system health is key, especially in all electric airplanes (meaning no vacuum system).  It’s a very good idea to turn on all the lights and pitot heat to ensure that a rise is indicated on the ammeter.  This means the alternator is carrying the load and working properly.

    The next time you do your runup, keep an eye on your EGT to see the rise during a magneto check.

  • L-3 Lynx Transponder Line

    ByHank Gibson

    L-3 has jumped into the ADS-B transponder game with their Lynx line of products.  Aircraft owners have a myriad of options with the Lynx line, from simply becoming ADS-B compliant with the NGT-1000 ($2,100, with ADS-B out that works with the GTX 327 and GTX 330), or going all in with the NGT-9000 touch screen transponder complete with ADS-B In, a traffic screen and NEXRAD ($6,800).

    L-3 Lynx

    The NGT 1000/2000/2500 line works with the existing transponder in the airplane (as long as it’s a Garmin GTX 327 or 330).  The 2000 gives ADS-B In capability, allowing the pilot to access NEXRAD and traffic, plus has a Wifi source to broadcast all the information to an iPad.  The 2500 includes all of that, plus gives the pilot MFD capability as well.  An optional control panel is available if the airplane is not equipped with one of the aforementioned Garmin transponders.

    The L-3 Lynx NGT-9000 is an actual transponder replacement.  It is a touch screen device that has a multitude of ADS-B features that, quite frankly, are really cool on a transponder.  The ADS-B traffic is displayed on the unit itself and can also be sent, via the optional Wifi connection, to an iPad on the WingXPro or SkyRadar apps.  The optional L-3 NextGen Active Traffic can also be installed to receive traffic callouts (this does not include resolution advisories).  Already have SkyWatch?  The L-3 Lynx can use the equipment.

    The L-3 Lynx NGT-9000 is also capable of displaying NEXRAD as well as METARs, TAFs, NOTAMs, and TFRs and a myriad of other weather products, all on it’s moving map.  It seems that L-3 has taken the transponder and turned it into something awesome.

    To read more about the L-3 Lynx line of transponders, you can visit their website.

  • Checking The Stall Warning Horn

    ByHank Gibson

    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.

    • Turn on the Avionics Master
    • Turn on the speaker
    • Put the flaps to full
    • Then move the stall warning vane and you’ll hear the horn

    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.

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