Selecting the Proper Altitude

Selecting the Proper Altitude

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One of the first questions a student pilot asks me when starting the cross country portion of his or her training is, how do I know what altitude is best for my flight?  This is a good question, because without taking certain aspects of the flight into account, it’s really just a crap shoot when selecting an altitude.  Craps and flying don’t mix, so let’s take a look at a few considerations when selecting an altitude.

Sky Coverage

Sky coverage has several subcategories when it comes to selecting an altitude.  First is how high are the bases?  Is it IFR (VFR pilots would be grounded), marginal VFR (1,000 AGL to 3,000 AGL ceiling), or good VFR (above 3,000 AGL ceiling)?  If the cloud deck is only 2,500 feet off the ground, then VFR pilots are limited to either 1,000 AGL to 2,000 AGL.  This is an excellent segue into why VFR pilots shouldn’t scud run!

Scattered Clouds

Second, what kind of cloud deck is it?  Is it an actual ceiling (broken or overcast), or is it a scattered layer?  Few or scattered layers usually allow VFR pilots to find a hole to get higher to some smoother air, making the flight more pleasant.  VFR pilots, always make sure to check the destination weather as it could be scattered where you are departing from, but it might be broken or overcast where you are arriving.

Last, how high are the tops of the clouds?  Pilots can only get this information in the planning stage from the area forecast or from pilot reports, so most of the time, it’s not very precise information.  If the tops are at 10,000 feet and the pilot is flying a 172 on a 30 mile trip, it doesn’t make much sense to get on top of the clouds.

Terrain and Obstacles

Terrain goes hand in hand with sky coverage.  If there are low clouds and high terrain, that doesn’t bode well for trying to stay VFR and not hitting anything.  Obstacles need to be taken into account too, as there are some pretty tall radio towers that can stretch up into a 1,500-2,000 AGL deck of clouds.

Winds Aloft

Winds Aloft

Once the sky coverage and terrain have been considered, it’s time to look at the winds aloft.  Tailwinds are preferred, but, sometimes, a headwind is the only option.  After taking the clouds and terrain into account, this narrows down your altitude to a handful of options.  The winds aloft will further narrow it down.

Aircraft Performance

Once you have two or three altitudes in mind, taking a look at the performance charts for your airplane will help nail down that final altitude.  Pull out the POH, compare fuel burn and cruise speed, and you’ll have your altitude selected.

Skyvector Has a New Look

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Skyvector has changed it’s look.  The aeronautical chart website is now offering flight plan filing capability. In order to gain the ability to file flight plans, the user has to form an account first.

Personally, I really liked how Skyvector had a simple interface before they changed.  As an instructor, a lot of times, I go to multiple airports on one flight.  It was really nice to just plug in airport IDs to check distances and heading information on Skyvector.  The new format is a little clunky as the website has made it a little more difficult to do what it did best before.

Did the aviation community need another venue to file flight plans?  Not with Foreflight, Garmin Pilot, and WingXPro leading the way in the app market.  Skyvector was smart in not trying to develop another app to compete with the big boys.

Will the new Skyvector last?  We’ll see.  I’m hoping they’ll go back to the way they used to be, but we’ll see. I may use it enough to come around to liking it.

L-3 Lynx Transponder Line

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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.

That Pesky Rudder

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Whenever I get in an airplane with a pilot for recurrent training, I can assure myself that I will mention rudder usage more than once during the flight.  If it is in a tailwheel (or if the pilot is doing tailwheel training), I’m going to mention the rudder a lot.  How do I know this?  Because basic rudder skills are actually one of the most difficult things to master in flying.

Let’s start simple.  What does the rudder do?  The dictionary definition is it controls the movement about the vertical axis of the airplane.  If you stick a pole down through the CG of the airplane and rotate the airplane around that pole, this is the vertical axis.  Looking at it another way, the rudder moves the airplane’s nose left and right.  Keep this in mind as we move on.

Rudder

Every pilot thinks about the rudder during the takeoff roll.  Because of the torque effect, the pilot must add right rudder during the takeoff roll to stay on the runway centerline.  Depending on the airplane’s horsepower, more rudder pressure is needed in higher powered airplanes.  The problem usually shows up once the airplane gets in the air.

In the worst situation, after takeoff, the pilot will set both feet on the floor and completely disregard the rudder.  Torque effect and now P-factor are continuing to cause the airplane to yaw left, causing the need for right rudder.  With his feet on the floor, though, the pilot is allowing the airplane to yaw.  It’s not terribly noticeable for him in the front seat, but the back seat passengers (especially in a six seat or larger airplane) are certainly feeling it.

One particular problem spot on the climb is the climbing left turn.  In a climbing left turn, training says to add left rudder since it is a left turn (see below for the reasoning).  But, since the airplane is climbing and therefore experiencing left yawing tendencies due to the aforementioned effects, the pilot needs to continue pressing the right rudder, though the pressure won’t be as much as in a straight climb.  Watch the ball the next time you make a climbing left hand turn and it’ll make a believer out of you.

I find only a handful of pilots are this egregious.  Most pilots have rudder problems in turns and in turbulence.  We’ll tackle turns first.  As we all learned when we first started flying, due to adverse yaw, a pilot must add rudder in the turn’s direction.  Again, this isn’t usually where the problem shows up.  During the rollout is the problem area.

Let’s take a turn to the left.  The pilot rolls in, adding left rudder, arrives at his heading, then begins to roll out with the ailerons.  Left adverse yaw is now being experienced and right rudder is needed to smoothly transition back to level flight.  Need some visual assistance?  Watch the nose the next time you make a turn. If you are working the rudder properly, the nose will pivot on one point in the horizon.  If you aren’t using the rudder properly, the nose will draw a U shape on the horizon.  Try making some turns without rudder, see what it looks like, then use the rudder properly.  You’ll notice a big difference.

Finally, let’s talk turbulence.  As we all know, turbulence in the hot summer afternoon is quite pronounced. When the airplane experiences a bump, it usually doesn’t bounce straight up in the air.  There is usually some kind of rolling motion involved.  As the pilot corrects this rolling motion by moving the ailerons, adverse yaw is experienced (just like rolling into and out of a turn that we talked about above), so rudder is needed.  There isn’t a need to stomp on the rudder or you’ll cause the airplane to severely yaw in the other direction, but rudder pressure is needed.

Final approach is where this gets most pilots.  By controlling the nose and not allowing it to move around on final by using the rudder, this will make your approaches a little more stabilized leading to a more successful landing.

Feeling lost when it comes to the rudder?  Ask your instructor the next time you go fly to do some rudder exercises.  Most instructors don’t emphasize these basic stick and rudder skills which leaves pilots lacking as they move on in their aviation lives.  So make it a point to do some basic rudder work the next time you fly with your instructor.

Avidyne IFD 440 Receives Certification

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Avidyne’s plug and play replacement for the Garmin 430, the Avidyne IFD 440, finally received certification from the FAA last week.  The touch screen GPS unit is being marketed as a simple swap out for the Garmin 430.  This release follows up Avidyne’s release last year of the IFD 540, also a plug and play replacement, but for the Garmin 530.

The features and touch screen of the GPS units sound quite nifty, but it will be hard for Avidyne to compete with the GTN 750 and 650 from Garmin.  The unit prices for the IFD 540 and 440 will be less (and installation is simpler), but we will see how the company does.

Avidyne IFD 440

The STC allows for installation in 1,000 makes and models of aircraft, according to the company, so there are a lot of possibilities for installs.

In conjunction, Avidyne also released a new version of it’s software for both GPS units.  According to Avidyne, this will unlock multiple features that enhances the capabilities of both units.

To read more on the IFD 440 and it’s bigger brother, the IFD 540, check out Avidyne’s website.