For those of you in the Hill Country looking to kick off the Christmas month right, head over to the Castroville Airport (KCVB) on Saturday, December 6th and get yourself a short stack of flapjacks. For just $5, you can get yourself a good hearty breakfast that includes coffee or juice and bacon or sausage. The eating starts at 0800 and goes until 1200, local time. Come with an empty belly and an empty gas tank as CVB currently has some of the lowest priced gas in South Texas, currently listed at $4.70/gallon.
There will be plenty of hangar flying, lots of airplanes to look at, and most importantly, lots of pancakes!
Density Altitude: Pressure Altitude corrected for non-standard temperature.
That’s the book definition of density altitude. The problem is, that definition leaves a lot of general aviation pilots scratching their heads. What really is density altitude?
All airplane engines rely on air and fuel mixing together, then that mixture is ignited to create combustion. Normally aspirated piston engine airplanes get their best performance at sea level, where the air is nice and thick, allowing plenty of air molecules to get sucked in the engine intake. As a normally-aspirated airplane climbs, the ambient air pressure drops with an increase in altitude (the air gets thinner, less dense), thereby reducing airplane takeoff, climb, and landing performance. There just isn’t as much air at higher altitudes, to put it simply.
Turbo charged piston engines assist with this air density problem. A turbo charger boosts the air coming into the engine and fools the engine into thinking it is at sea level pressure all the time. The higher the altitude, the faster the turbo charger spins, spinning the compressor faster, which compresses more air to continue to give the engine sea level pressure air. This gets faster cruise speeds the higher you go.
Both normally aspirated & turbo charged engines do experience longer takeoff rolls and reduced climb rates at higher airport elevations & higher altitudes.
How does this all relate to density altitude?
When the outside air temperature rises, the air becomes thinner, less dense. This means that when an airport elevation is 1,000 feet, but the density altitude is reported as 3,000 feet, the airplane engine thinks it is at 3,000 feet. It won’t accelerate as fast. The airplane’s climb rate will also be reduced. That means that the normal climb pitch attitude a pilot is used to seeing won’t be accurate at higher density altitudes. It will lead to slower indicated airspeeds, slow enough to potentially lead to a stall if a pilot isn’t paying attention.
Where does this get dangerous? High elevation airports. Whenever the OAT creeps above 85 or 90 at an airport that is higher elevation (I would classify higher elevation as 2,500 feet or higher), the corresponding density altitude sky rockets. If a pilot isn’t paying attention to airspeed or angle of attack (if the airplane is equipped with an AOA), a stall can come very quickly on climb out.
What to take home from this? Monitor your climb speed and angle of attack, especially right after takeoff, when you hear density altitude on the ATIS or AWOS.
There are multiple ways to save money during the aircraft buying process. To start, since you are buying an airplane, you have some means of positive income in order to afford an airplane. Airplanes come in all different shapes and sizes and usually, an airplane can be found to fit almost any budget, whether is a $20,000 Texas Taildragger all the way up to a multi-million dollar jet.
One way is to stay within your budget. There will always be a shinier, newer, lower time airplane that is just above where you set your budget at. Don’t reach for it! There is a reason you set your budget where you did.
Another way is to shop around and get multiple insurance quotes. Your agent is in charge of engaging underwriters who are going to evaluate you and your airplane as risks, then price a policy accordingly. With most airplanes, you should get multiple quotes to see what fits you best. Beware though, because sometimes, you can get a lower rate, but it will require more training, so you end up shelling out more money in the long run. If you find a policy you like, but the training seems skewed or the liability isn’t high enough, you can always have your agent ask the underwriter to modify the quote. You are still in charge.
Finally, if you evaluate your mission and see that your budget can’t afford an airplane that carries enough or goes fast enough, look into taking on a partner or two to help with costs. Be thorough in vetting your potential partners as a good partnership is worth it’s weight in gold, but a bad one is downright unpleasant and often times hard to get out of. Find pilots who have the same mindset & personality you do and treat their stuff the same way you do. Try to take a ride in their car or go to their house, then you’ll see what kind of shape they will keep the airplane in.
The best way to cost yourself more money in the aircraft buying process?
Don’t do a pre-buy inspection.
A pre-buy inspection takes place after negotiations and once a Purchase Agreement is in place. You are pretty much set on the airplane, you just want a third party mechanic who is knowledgeable on that make and model of airplane (and this is a very important point) to go over it and make sure that it is sound from a mechanical standpoint. The buyer, you, want someone who has never had an association with the seller since the mechanic will be your representative in the process and you want him answering to you.
If you have used a broker or a buyer’s agent, that person should have already gone through the logbooks for you, so you’ll have a basic idea of the history of the airplane. However, knowledgeable mechanics find things all the time that turn out to be the responsibility of the seller to repair since it happened on their watch. Without a pre-buy, you would end up having to pay for that in the not to distant future.
Here is an example of where not doing a pre-buy can cost a lot of money.
An owner bought a late ’70s model Citation ISP, one of the very first Citations ever made. It had been based in Florida (salt & humidity + aircraft don’t mix well) for a while. The buyer didn’t use a broker, but thankfully had someone look through the maintenance history of the airplane. Since it was so old, the logbook reviewer didn’t have time to do anything but a basic overview, but he gave the thumbs up to the buyer.
The buyer decided he just wanted a boroscope inspection and the seller’s mechanics to look over the airplane. Remember what I said before about a third party mechanic? Well, these mechanics didn’t do a very thorough job. When the buyer took delivery of the plane, after about 10 hours of flying, he already had an $18,000-$25,000 maintenance bill.
You may say, well that’s a jet. Jet’s have specialized maintenance and need a more extensive pre-buy inspection.
On the contrary, in my 8 years in the training business, I have seen Cirrus, Piper PA46s, Bonanzas and several other piston engine airplanes that either didn’t have a pre-buy done or the pre-buy was done by someone who didn’t know that airframe. Lo and behold, things started breaking and adding up very quickly that would have been discovered on a good pre-buy inspection.
Don’t skip on the pre-buy inspection. They usually run a few thousand dollars, but save tons of money in the long run.
When it comes to turboprop engines, a hot start is a really bad thing. For you piston drivers out there thinking, “What’s the big deal, you are just starting a hot engine,” then here’s a little education for you.
In a PT6 turboprop engine, there is a very important temperature gauge that a pilot monitors very closely during each and every start. It is called the Inter-Turbine Temperature gauge, or ITT. This temperature is a measurement of the exhaust gases between the compressor turbine and the power turbine (s). In the picture below, the probe is located where the blue and red colors meet.
In a turboprop engine, specifically the Pratt & Whitney PT-6 in all it’s different sizes and variations, there will always be a specific temperature that the pilot will want to keep the ITT below. This article will deal specifically with a Piper Meridian.
A Piper Meridian starts hotter than almost any other PT6 engine because of the way it’s air intake is designed. Unlike other turboprops, the Meridian has a permanently open inertial separator. This means that not all the intake air makes it to the engine during start because some of it goes out the inertial separator opening. So, coming to a Meridian from operating other turboprop engines can lead to a little bit of a surprise on the ITT temperature being higher than what a pilot is used to when starting.
As a rule of thumb, when starting a Meridian, never let a start continue when the ITT hits 875 degrees. Based on the chart below, you are still in the safe zone at 875 and have about a 50 degree buffer before you have to start getting worried.
On cold starts with a good battery or a GPU, 875 is typically not an issue. Most starts when cold are going to be in the high 700s or low 800s. On a cold start, if you are seeing starts in the mid to upper 800s, try starting with a GPU and see if that lowers the start temperature. If it does, then that means your battery is weak and needs to be replaced. Another tell-tale sign of a weak batter is the Ng doesn’t spool up properly (meaning it settles around 12-13%) or takes a really long time to spool up. Also, never start on the battery with less than 24 volts.
When there are multiple flights in one day, the pilot has to take into consideration the warm engine prior to starting. If the ITT, prior to the start sequence, is above 150 degrees, it is time to do some motoring of the engine.
What is motoring? It is simply using the starter to turn the engine, which leads to air being sucked into the engine allowing the engine to cool off prior to start. The theory is, the cooler your engine prior to start, the cooler the ITT peaks at during start.
Here’s the steps on how to dry motor a Piper Meridian:
Battery on
Strobes on
Fuel Pumps and Ignition off
Throttle idle
Condition Lever feather/cutoff
Push the start button
Monitor the ITT temperature
Reaching 150 degrees, if less than 30 seconds have elapsed:
Fuel Pumps on
Ignition On
Condition Lever run
Reaching 150 degrees, if 30 seconds have elapsed:
Push Manual/Stop button to stop the start
Let starter rest for 30 seconds
The starter has a 30 second limit on the Meridian, followed by a 30 second rest period. You can do the sequence twice, then, after the 3rd start, there is a 30 minute rest period. Typically, if the ITT won’t cool down to 150 after the 3rd time, there is probably something wrong.
The most important thing a pilot can remember is never, ever push the condition lever forward if the ITT is above 150 degrees. You’ll be well on your way to avoiding hot starts that way.
There are a number of airplanes out there equipped with the Avidyne Entegra PFD and MFD system, most notably the Cirrus SR20 and SR22 models from the early 2000s and the Columbia 350 and 400 from the same era. The Entegra is pretty simple and easy to learn, but doesn’t have the capability that it’s Garmin glass panel counterparts do (I have not, however, tried the R9, which could prove much more capable than it’s predecessor). I have found that pilots master the Entegra a lot quicker because of the reduced functionality.
One of the nice features of the Avidyne Entegra is the CMAX Chartview option. With a yearly subscription, you can get all the Jeppesen approach plates and airport diagrams for the entire US on your MFD. Just like your GPS, though, you have to update the charts monthly to keep them legal. After a period of time when you don’t keep up with the updates (I believe it is 90 days), then the charts disappear.
The update process is a little tricky if you don’t have someone to explain it to you. Once you go through it a few times, you’ll have it down pat. Here’s the process for the Avidyne Entegra Chart Updates.
Jeppesen Subscription
The first step in performing your Avidyne Entegra Chart Updates is to create an account with Jeppesen, who handles all the GPS NavData and MFD Chart updates for both Garmin and Avidyne. If you already have a Jeppesen subscription, you can skip down to the next section. To do that, simply go to jeppdirect.jeppesen.com, and then do the following:
Click on Avionics Data on the upper left hand side
Click “Purchase Avionics Subscription”
Then, click on “Create Account” in the new users section
Once you’ve created an account, login, then put in your aircraft information and select 1 update for the Avidyne Entegra EX500 EX 5000
Click Continue at the bottom and you can put in your payment information
Software Needed
There are two different programs depending on if you have a PC or a Mac. If you have a PC, you need the Jeppesen Services Update Manager (JSUM). If you have a Mac, you need the Jeppesen Distribution Manager (JDM). Download whichever one you need, then login, and your updates will show up.
Downloading the Avidyne Entegra Chart Updates
First, we’ll go through the process of performing the Avidyne Entegra Chart Updates process for a Windows computer, using JSUM. You’ll need two 2 GB USB drives formatted to FAT 16. Here’s how to format to FAT 16.
Go to My Computer after inserting the USB drive
Right click on the drive
Click on Format, then select FAT and press OK
Once the USB drive is formatted to FAT16, open up the JSUM program. Login and your updates will be displayed on the screen
You’ll need to set the Avidyne CMAX Key Code
Right click the Avidyne Electronic Charts Service and click Set Avidyne Key
To get the key code, visit MyAvidyne.com and create an account using your JeppView subscription number and your serial number for your Avidyne MFD (found on the AUX page) and your PFD serial number (displayed on startup when the PFD is warming up)
Once you get the Key Code, copy and paste it in the window and click OK
Click on the service and click Start
The program should automatically detect the drive (if it doesn’t, click browse and select the drive)
Click Continue and the charts will start downloading and automatically programmed to the USB drive
If you are updating NavData on the MFD as well, follow the same steps as listed above in order to update the NavData
Next, we’ll go through the Avidyne Entegra Chart Updates process on a Mac, using the JDM program. You’ll need two 2 GB USB flash drives formatted to FAT 16 (the easiest way to format to FAT 16 is on a Windows computer, using the process above).
Open the JDM program and login
Insert the first USB drive
You’ll need to set your Avidyne CMAX Key Code
Click Service Details under the Electronic Charts Service
Click Set Avidyne CMAX Key Code
Program automatically detects the USB drive
Click and drag the Electronic Charts service over to the USB and release
The service is downloaded and copied to the USB drive automatically
Eject the USB drive
Insert the second USB drive (or plug the USB drive in to your MFD, do the update, then reformat the drive) and follow the same steps for the NavData
Updated the MFD with the Avidyne Entegra Chart Updates
Once everything is programmed the your USB drives, the rest of the process is simple. Just go out to your airplane, plug in the first USB drive with the Electronic Charts on it, turn your battery on and the avionics master, and the system will upload the information automatically. Once it’s finished, turn everything off, pull the USB drive out, then insert the second USB drive and do the same thing.
Now, you’re all updated!
If you’d like to see a video on the process, Jeppesen has some very good videos on the updating procedure. The links are below. If you have questions, please contact Texas Top Aviation and an expert will help you through the process.
This is a Press Release from Daher’s website, the maker of the TBM 960.
Sun ‘n Fun Aerospace Expo, Lakeland, Florida, April 5, 2022 – Daher today unveiled the latest high-end version of its TBM pressurized single turboprop aircraft family – the TBM 960 – which incorporates Pratt & Whitney Canada’s advanced PT6E-66XT engine and a fully digital e-throttle, along with a digitally-controlled cabin that incorporates an all-new environmental control system, LED ambience lighting and electrically-dimmable windows.
The TBM 960 was introduced at the Sun ‘n Fun Aerospace Expo in Lakeland, Florida, where Daher is exhibiting the first production airplane (exhibit stand #MD-22B).
“The TBM 960 is the quintessential TBM, representing the fifth evolution of our very fast turboprop aircraft family since the TBM 900-series’ introduction in 2014,” commented Nicolas Chabbert, the Senior Vice President of Daher’s Aircraft Division. “It takes the maximum advantage of today’s turboprop technology to provide digital control of the engine and the propeller.”
The TBM 960 retains the rapid speed of Daher’s TBM family while enabling lower fuel consumption. At Daher’s recommended cruise setting of 308 kts., the fuel consumption is only 57 U.S. gallons per hour, which is a 10% fuel economy compared to maximum cruise setting for more sustainability.
At the heart of this latest TBM version is the intelligent PT6E-66XT powerplant and Hartzell Propeller’s five-blade RaptorTM composite propeller, both of which are linked to the dual-channel digital Engine and Propeller Electronic Control System (EPECS).
With the EPECS, the PT6E-66XT’s startup is fully automated after a single-switch activation. The cockpit’s power lever is an e-throttle, using a single forward position from takeoff to landing – with the EPECS optimizing powerplant performance throughout the flight envelope while
Daher unveils the TBM 960 at Sun ‘n Fun Aerospace Expo
reducing pilot workload by integrating all functions and protecting the engine’s life. Analysis of engine parameters is driven by 100-plus smart data inputs.
The RaptorTM propeller is fully integrated into the propulsion system. It is specifically designed to reduce overall weight and improve the TBM 960’s takeoff distance, climb and cruise speed. Turning at 1,925 rpm during maximum power output, the Raptor contributes to limiting noise and vibration. Its sound level during takeoff is just 76.4 decibels, meeting the most stringent international noise standards.
With its G3000® integrated flight deck, the TBM 960 retains Daher’s e-copilot® concentration of technological innovation and safety systems in the TBM, which can be compared to an “electronic copilot.” This includes an icing protection system, flight envelope monitoring through the Electronic Stability and Protection (ESP) and the Under-speed Protection (USP) systems, the Emergency Descent Mode (EDM) function, as well as the game-changing HomeSafeTM emergency autoland system.
New to the TBM 960 is the Garmin GWXTM 8000 doppler weather radar with advanced surveillance features such as lightning and hail prediction, turbulence detection, zero blind range for close-in returns, and ground clutter suppression. The TBM 960 also is the first application of Garmin’s GDL® 60 next-generation data transmitter for automatic database upload and interconnection with mobile devices.
The TBM 960’s Prestige cabin extends Daher’s use of digital power inside the aircraft, featuring an all-new environmental control system, LED ambience strip lighting integrated into both sides of the overhead ceiling panel, and electronically-dimmable windows – all controlled by a PassengerComfortDisplay(PCD). Enhancementsinthecabin’sstyleandcomfortalsoinclude new ergonomically enhanced seats, USB-A and USB-C power plugs, individual cupholders and headset hangers for each occupant.
For the TBM 960, a fifth TBM paint scheme – called Sirocco, based on the creativity of French designer Alexandre Echasseriau – has been added to the aircraft’s style customization possibilities.
The TBM 960 has been certified by EASA (the European Union Aviation Safety Agency); with certification by the U.S. FAA (Federal Aviation Administration) currently underway. Deliveries will begin in the first half of 2022.
With the new aircraft’s launch, Daher’s TBM family is now offered in two versions: the TBM 960 and TBM 910.
Redbird Skyport at the San Marcos Regional Airport will be hosting it’s 6th Annual Redbird Migration Flight Training Conference. The event is focused on flight training and flight training providers. Past speakers have included the president of Hartnell Propellers, the CEO of Big Red, and various Redbird Executives.
The list of speakers for this year’s Migration has yet to be released, but it promises to be a good lineup. Attendees every year always compliment Redbird on the event and the speakers they bring in.
If you are a CFI or flight school owner interested in attending, check out Redbird’s event page to request an invitation.
