Garmin GTN 750 Tips & Tricks

ByHank Gibson

The Garmin GTN 750 is an awesome piece of equipment.  Garmin tried to make the user interface with the touch screen as simple as possible (though there still is a bit of a learning curve when moving up from a Garmin 530W).  Garmin also integrated several key features that the 530W did not have that makes flying with a Garmin GTN 750 in IFR all that much better.

The two features of the Garmin GTN 750 I want to focus on today are the “Load Airway” feature and the “Hold at Waypoint” feature.  If a pilot isn’t looking for these specifically, they can actually be a bit hard to find.  The “Load Airway” feature is especially handy when flying IFR long distances with several airways as part of the clearance.  Here’s how to utilize both.

Load Airway

  1. On your flight plan page, insert the waypoint that you will be joining the airway, or, if your clearance was radar vectors to join an airway, then insert the waypoint on the airway that begins the leg you will be joining on.
  2. Tap the waypoint you just inserted.
  3. A menu will pop up.  Tap Load Airway.
  4. Select the Airway you want from the next menu that pops up.
  5. Then, a list of waypoints will display to exit the airway.  Select the waypoint where you will be exiting the airway.
    1. Note:  Garmin defaults to listing these waypoints alphabetically.  If you unselect the “Sort Alpha” option, it will sort the waypoints by direction and distance from the entry waypoint.  This is a little more practical, easier to work with, and how I recommend doing it.  This way you can either scroll up or down depending on the direction of travel on the airway and find your exit waypoint.
  6. Tap Load.
  7. The Airway and all the waypoints in between your entry and exit waypoints appear in your flight plan.
  8. If you are getting vectors to join the airway, you’ll need to use the Activate Leg function to activate the leg you will be joining the airway on.
    1. On the Flight Plan page, tap the waypoint that ends the leg you want to activate.
    2. On the menu that pops up, tap Activate Leg.

Hold At Waypoint

The Garmin GTN 750 allows pilots to place a holding pattern at any waypoint that is in the Nav Database (or any user created waypoint).  Here’s how to do it.

  1. On the Flight Plan page, tap the Waypoint that you want to hold at.
  2. On the menu that pops up, tap Hold At Waypoint
  3. On the next menu that pops up, input either the inbound or outbound course, right or left turns, leg time or distance, and the EFC time, then tap Load.
  4. You will see the hold now as a Waypoint in your flight plan.

 

Once the hold is entered, the GPS will go into Suspend mode, suspending the Flight Plan Waypoint Sequencing.  Once you are ready to depart the hold, you will have to tap Unsuspend before crossing the holding point on the inbound leg, then the GPS will resume normal waypoint sequencing.

These are 2 of the really cool, gee-wiz features of the Garmin GTN 750.  Following the above steps will make IFR flying much easier for the pilot, as well as much more enjoyable!

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  • Breathing…It’s The Difference in Engine Performance

    ByJoe Casey

    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.

  • Matching the Airplane with Your Mission

    ByHank Gibson

    Has it come time to buy your first airplane?  Have the skies been calling your name?  Or are you just tired of standing in the airport security line then getting shoved in a long metal tube with no leg room?  Or, maybe you are a businessman who does business in remote areas that have local airports but are hard to get to commercially.

    Wherever your need is, you have decided it’s time to make a purchase.  If you are familiar with aviation, you may have an airplane in mind that you would like to have, but is that the right airplane for your mission?  If you are new to aviation, you may have no idea what airplane to go for.  Here are some helpful hints in narrowing down the different airplane options out there to fit your specific mission.

    Flying For Enjoyment, but Not Going Far Fast

    Piper Cherokee

    If you’re just a weekend flyer who is tired of dealing with flight school rentals, but you don’t need to carry a lot of people or go very far, your options are pretty numerous.  Anything from a Cessna 152 to a Piper Cherokee, maybe a Beech Sundowner, or a Bellanca Viking, or anything in between.  If you are content with taking a weekend hop for a hamburger at 100-110 knots, you have limitless options for airplanes.  Tailwheels (Cubs, Citabrias, Huskies) are excellent birds for you well.

    Getting Places Fast With Only You and Maybe One Passenger

    Need to go 200-300 miles fast and not worried about weight?  A Cirrus SR22T, a Columbia 400, or Cessna Corvalis might be just what you need.  Cruise speeds on those are all around 180-190 knots at 10,000 feet. All are oxygen equipped if you want more speed higher up, as the service ceilings are 25,000 feet.  Payloads run in the range of 400-500 pounds with full fuel.  All these have air conditioning options, too.

    Hauling More Weight, but Still Need the Speed?

    Cessna 206 Mission

    A little slower (150-170 knots) but a little bit more payload options are A36 & B36 Bonanzas, Piper Saratogas, Cessna 206s, or Cessna 210s might suit your fancy.  All come in turbo models if you are a high elevation dweller.  The Cessna 206 has been used for many years as cargo and people haulers in remote regions like Alaska, South America, and Africa.  I’ve even seen pictures of snowmobiles being carried in a 206.

    Tired of Oxygen Cannulas?

    The next step up from a Cirrus, Corvalis, or Saratoga is the Piper Malibu.  A bigger brother to the Saratoga, the different PA-46 models offer one of the best options for a single engine piston out there.  All except the Matrix (PA-46-350T) are pressurized, all the pistons cruise about 200 knots, and all are configured with club seating with plenty of leg room.  Useful loads range around 1200-1400 pounds (they hold 120 gallons of fuel, so payloads range from 480-680 pounds).  The original Malibu (PA-46-310P) only burns 16.5 GPH so that allows partial fuel to be carried to allow more people and bags.  All have 6 seats.

    Need to Carry Even More Weight?

    It’s time to get into the piston twin market, then.  A Cessna 414, a Cessna 421, a Cessna 340, a Beech Duke or a Beech Baron are all pretty good options here.  The 421 and the 414 have the largest cabins, while the Duke has the highest useful load.  Cruise speeds range from 200-220 knots, but the cabin is roomier and you get a few more pounds useful load than a piston single.  If you do get into a 421, get good training as they are equipped with Continental geared engines, which can be tricky to operate if you don’t know what you are doing.

    Need to Carry a Lot of People and Go Fast?

    Turboprops are the way to go for you.  King Airs have the most utility while  the Pilatus PC-12 is the cream of the single engine turboprop crop as you can put almost anything you want in it.  If you have 4-5 passengers, stay away from a Piper Meridian as you can’t carry a lot of weight.  Those are better for 2-3 passengers at the most (plus a pilot).  The TBM 900 is pricey, but fast (300-325 knots).  The original TBM 700 can be had for under a million bucks, you get 280 knots, and a very usable useful load.  You still can’t fill all 6 seats with full fuel, but you can do more with it then a Meridian.

    Have a Boatload of Money Sitting Around?

    A jet might be for you then.  Fuel, insurance, maintenance, and hangar costs are high, but jets will get you places real fast with room for all your friends and family.

    Gulfstream

     

  • Garmin VNV

    ByHank Gibson

    The Garmin G1000/Perspective combined with the Garmin GFC 700 Autopilot can be a great tool in descent planning.  When you want to end up at pattern altitude a certain distance from the airport or you get a clearance to cross a fix at a certain altitude, Garmin VNV is a great tool.  Here’s how to use it.

    VFR Garmin VNV Use

    Let’s say you want to end up at pattern altitude 3nm from your destination, but you don’t want to descend down into the bumps before you have to.  Here’s how to set it up:

    • Go to the Flight Plan page on the MFD
    • Press the ATK OFST soft key on the bottom of the MFD.  It stands for Along Track Offset, which, in laymen’s terms, means you are setting a point along your track a certain distance from your destination.  In this case, it will be 3nm
    • Input the distance using either the keypad or the small FMS knob and press enter
    • Select the altitude you want to be at (in this case pattern altitude) and press enter
    • You will see a point 3nm before you destination appear on your magenta line and a Top Of Descent (TOD) appear where you need to start your descent
    • 1 minute before the Top Of Descent, an indicator will appear next to your altimeter
    • To have the GFC 700 Autopilot fly the descent for you, you have to do two things
      • Set the Altitude bug for the desired altitude
      • Press VNV on the autopilot
    • All you have to do now is manage power

    IFR Garmin VNV Use

    Let’s say you are told to cross a fix at a specific altitude.  Here’s how to use Garmin VNV to plan it out.

    • Go to the Flight Plan page on the MFD
    • Turn the cursor on and highlight the altitude blank next to the fix in the flight plan
    • Input the desired altitude
    • You will see a Top Of Descent (TOD) point appear along your course where you need to start your descent
    • 1 minute before the Top Of Descent, an indicator will appear next to your altimeter
    • To have the GFC 700 Autopilot fly the descent for you, you have to do two things
      • Set the Altitude bug for the desired altitude
      • Press VNV on the autopilot
    • All you have to do now is manage power

  • The Importance of Transition Training

    ByHank Gibson

    In September, the FAASTeam at the San Antonio FSDO put a special emphasis on transition training (AOPA put out a free course last year covering general transition training topics).  A lot of pilots don’t understand the need for transition training or what it even entails.

    Transition training deals mainly with piston engine aircraft, regardless of whether the airplane is a single or twin.  The FAA doesn’t have any special requirements for changing from one piston engine airplane to another, as long as the pilot has the appropriate endorsements (high performance, complex, high altitude, etc.) and is rated in that category and class.

    Transition training is promoted mostly by insurance companies. An insurance company looks at a pilots experience when deciding to insure him or her in a new airplane.  If the pilot has only flown Cherokees and Comanches and is now upgrading to a Malibu, then the insurance company is going to require some transition training with a knowledgable instructor.

    What is transition training?  It is when an appropriate rated pilot needs to learn how to fly a different airplane.  These are referred to commonly as checkouts, but with more complicated airplanes, the training is actually very in depth.

    Using the example above, Pilot A just sold his Comanche 260 and bought a 1987 Malibu.  Pilot A says, “A Malibu is a complex, high performance, single engine piston, which is what I had in my Comanche.  I can fly that, no problem.”  In reality, a Malibu has a lot of differences.

    pa46-transition-training

    First, there are more systems in a Malibu.  You have pressurization, air conditioning, emergency oxygen, turbo charging, and possibly radar.  Not to mention you are dealing with a Continental engine instead of a Lycoming.  And, is it a factory TSIO 520 or a converted 550?  2, 3, or 4 blade prop?  Glass panel or steam gauges?  What kind of autopilot?  Plus, it’s a much heavier airplane so it’s going to fly different, have different rotation and landing speeds and handle differently in stalls.  What’s the sight picture supposed to be on final approach?  What are the emergency procedures?

    Overwhelmed yet?

    An experienced, insurance approved instructor and training program is a necessity when getting into new airplanes.  It makes for safe pilots and safer skies.

    Texas Top Aviation offers Cirrus Transition Training as well as Bonanza Transition Training and Columbia/Corvalis Transition Training.  We are working on an insurance approved Piper PA 46 piston transition course as well (Malibu and Mirage) and will have the course approved by the end of 2016.  Contact us today to schedule your transition training.

  • AOPA Air Safety Institute: More Difficult Decisions

    ByHank Gibson

    The AOPA Air Safety Institute is making it’s annual loop through Texas this January. The topic for this Safety Seminar is “More Difficult Decisions: Choices & Consequences.”

    The seminar is geared our the decision making process that we as pilots face on each flight. Some decisions are easy (what altitude should I pick?) while some have much greater consequences and should be taken very seriously.

    This event will be interactive for the participants as several scenarios will be presented. The goal is to help pilots learn to think through each decision, weighing the consequences along the weigh to arrive at the safest outcome of the flight.

    The first area seminar will be held on Tuesday, January 21st at the Stinson Field Airport (KSSF, 8535 Mission Road, San Antonio, TX 78214). The second area seminar will be held on Wednesday, January 22nd at the TXDOT office in Austin (200 E. Riverside Dr., Austin, TX 78704). WINGs credit is available for all attendees.

    Learn more here.

  • Flying To Mexico

    ByHank Gibson

    I took a Piper Malibu to Cabo San Lucas a few weeks back.  This was my second trip flying to Mexico, but the first where I arranged everything.  Cabo is a beautiful place and the MMSL airport is a fabulous facility. For those who haven’t been fying to Mexico before, MMSL is the place to go.  The folks there are extremely helpful and do most of the paperwork for you.  You just have to pass along your information to them.

    Mexico Flying

    Flying to Mexico and back out is different than flying in the US.  First of all, don’t forget your passport. The authorities on both sides frown upon that.  You’ll probably get sent back to the US (or sent back to Mexico if you are on your return trip).  Your aircraft also needs, Mexican insurance (talk to your US insurance agent) a radio license, and a customs decal.

    Second, you’ll have to file an ICAO specific flight plan for flying to Mexico.  This is available on Foreflight now, but I really like Fltplan.com’s way of doing it.  I don’t fly internationally enough to remember what everything means, but Fltplan.com does a great job of walking pilots through the the different classifications.  It’s almost impossible to get confused.

    Third, you have to fill out an eAPIS form.  This has to be done at least 24 hours prior to departure from the US, but it can be done as far in advance as you’d like.  If your departure time changes or your passengers change, you can edit the eAPIS form to bring it current.

    Flying to Mexico IFR is a lot simpler than flying VFR.  I have only flown IFR and it is very easy.  I’m already on a flight plan, already squawking a discreet code, and already on radar, so there really isn’t any way I can mess up the ADIZ penetration.  I really recommend going in and out of Mexico IFR instead of VFR.

    Once you land in Mexico, you have to close your IFR flight plan.  The tower doesn’t do this for you.  After clearing customs, you’ll have to pay a landing fee and sign your flight plan confirming you have arrived and closing it out.

    When departing, you have to file another eAPIS 24 hours in advance.  Wherever you plan on clearing Customs in the US, you’ll need to call the Customs office no less than 1 hour, but not more than 23 hours before arrival.  It’s called an Advanced Notice of Arrival.

    You’ll need to fill out a paper flight plan before departing, clear customs again to leave, then away you go.

    There are a lot of really fun getaways in Mexico and flying there doesn’t have to be difficult.  When you have the right information, flying to Mexico can be a breeze!

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