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.
Thank you to everyone who made the 2022 Texas Top Aviation Fly In at the Hilton Santa Fe Buffalo Thunder Resort a success!
We had 22 attendees and 12 airplanes make it out to beautiful Santa Fe, New Mexico for the week.
After 2 days of very competitive golf, Chris Travland was our 2022 Texas Top Aviation Fly In Golf Tournament Champion.
While you are out in Santa Fe on your next trip, go check out the Rancho de Chimaya restaurant. It was excellent and a true New Mexican experience.
Mark your calendars for the 2023 Texas Top Aviation Dallas Fly In at the Westin Stonebriar Resort in Frisco, TX. McKinney National Airport (KTKI) will be our host airport. The event will be April 12th-April 14th, 2023. Hope to see you all there!
Thank you to everyone who made the 2022 Texas Top Aviation Fly In at the Hilton Santa Fe Buffalo Thunder Resort a success! We had 22 attendees and 12 airplanes make it out to beautiful Santa Fe, New Mexico for the week. After 2 days of very competitive golf, Chris Travland was our 2022 Texas…
The Garmin GFC 700 Autopilot is an amazing machine. Fully digital and fully integrated with the Garmin G1000 glass panel, it makes a pilot’s workload a lot easier, especially in busy airspace.
I train a lot of pilots in airplanes that have the Garmin GFC 700 autopilot. The Cirrus SR22, the Columbia 350 & 400, the G36 Bonanza, and the Piper Mirage and M350 to name a few. The most common problem I see for pilots transitioning into the Garmin GFC 700 equipped aircraft is that it doesn’t act like other autopilots.
STECs and DFC 90 Autopilots function like this: you push the button for the mode you want on the autopilot controller and that turns the autopilot on.
Not so on the Garmin GFC 700. If you push the button for the mode on the GFC 700, then the flight director engages, but not the autopilot. This confuses folks a lot who move up from different autopilots because their autopilot primacy side of their brain is telling them the autopilot is on whenever they push one of the buttons on the GFC 700 controller.
Here’s an example: A pilot has just departed and is ready to turn on course. In his old airplane with an STEC 55x autopilot, the pilot pushes the direct to key to go to his first waypoint, then pushes NAV on the autopilot controller and the STEC 55x comes on and starts flying on course. Then he presses VS and ALT to initiate a climb.
With the same scenario and a Garmin GFC 700 autopilot, the same pilot (who is used to a 55x), pushes the direct to key, then pushes NAV on the autopilot controller and pushes IAS or FLC to initiate the climb. He lets go of the flight controls thinking the autopilot is engaged. The airplane starts nosing over and he starts panicking.
Why did this happen? The pilot in the second scenario never pushed the AP button on the Garmin GFC 700 so the autopilot never engaged. All he did by pressing the NAV button and IAS button was to turn the flight director on.
How to remedy this? Get in the habit of checking your scoreboard. On the top of the G1000 or Garmin Perspective PFD, there is an autopilot annunciation strip (or scoreboard as I like to call it). In the very middle of the scoreboard is an area to show if the autopilot or flight director is engaged. AP means the autopilot is on; FD means the flight director is engaged but the autopilot is not.
I teach pilots to be in the habit of checking your scoreboard each time you get done pressing buttons on the autopilot controller to ensure the Garmin GFC 700 is in the proper mode. This saves some of those panic moments when it is supposed the AP is engaged, but it’s only the FD.
The Garmin GFC 700 Autopilot is an amazing machine. Fully digital and fully integrated with the Garmin G1000 glass panel, it makes a pilot’s workload a lot easier, especially in busy airspace. I train a lot of pilots in airplanes that have the Garmin GFC 700 autopilot. The Cirrus SR22, the Columbia 350 & 400,…
Four things moved this market between July and the end of September, and each one changes the arithmetic on what your airplane is worth today. Inventory is thinner than it was a year ago and has stopped draining. Asking values have split. The Fed raised rates and has penciled in one more increase for December. And the FAA ended single-pilot operation in the legacy Citations. Here is the short version, and what I would do about it before December 31.
The short version
Turboprop inventory is running about 12% under last year, and the field stopped shrinking in September.
Piston asking values are still giving back. Turbine asking values have turned up.
The federal funds rate is 3.75–4.00%, with one more quarter-point increase projected for December.
The FAA rescinded the legacy Citation single-pilot exemptions on September 29, with no wind-down.
Accepted offer to closing runs 30 to 45 days. To close before December 31 you need an offer accepted by about November 15 — which means listing by October 31.
Inventory is thin, and it stopped draining
In September, used single-engine piston inventory in the U.S. and Canada was down 12.2% against last year. Turboprops were down 12.0% worldwide. Jets were down 23.6%, with the large-cabin end off 39.8%. The field your airplane competes against is smaller than it was a year ago.
The monthly direction is the other half. Piston inventory was flat in September, turboprops rose 3.5% and jets rose 5.1% — the second month running that inventory added rather than drained. So the field is thin by the standard of a year ago, and it is no longer getting thinner.
Asking values have split
The three categories stopped moving together. Piston singles fell 0.74% on the month and are down 2.36% against last year. Turboprops rose 0.22% on the month and are up 0.57% on the year. Jets rose 2.02% on the month and are up 0.71%, led by the super-mids at plus 5.29%.
Asking prices are not values, and I will keep saying that. What they give you is the leading edge — VREF and the closed comps follow a quarter or two behind. Right now that edge says the turbine market has turned the corner and the piston market has not.
Rates went up, and may go again in December
On September 16 the Federal Open Market Committee raised the federal funds rate a quarter point, to 3.75–4.00% — the first increase since 2023, on a unanimous vote. The Committee’s own projections point to one more quarter-point increase in December. A financed buyer’s payment is higher than it was in the spring, and his offer reflects it.
The FAA ended single-pilot flying in the legacy Citations
On September 28 the FAA published a policy change rescinding the training-provider exemptions that let a single pilot fly the transport-category Citations. Effective September 29, no wind-down. Thirteen of the fourteen exemption holders reviewed were rescinded or denied renewal.
It catches the two-crew airframes: the 500, 550, S550, 552, 560, 550 Bravo, 560 Encore and Encore+. It does not touch the 501, the 551, the CJ/525 family, the Mustang, or any turboprop.
A large share of those airplanes are owner-flown. That owner now hires a second pilot for every leg, or he stops flying. NBAA and Citation Jet Pilots asked for a 90-day pause on September 29. No answer yet.
The 500-series Citations. The single-pilot exemption ended September 29, with no wind-down.
Why single-engine turboprops gain from it
The demand moves, it does not disappear. The owner-pilot still wants to fly himself, and what he can legally fly is a short list: the CJ family, the Vision Jet, and the single-pilot turbines — TBM, M500, M600, M700, PC-12, JetProp. Those are legal single-pilot by type certificate, not by exemption.
The budgets line up. A clean legacy Citation’s price buys a strong TBM or a good PC-12, so these buyers arrive at the top of the turboprop market, where supply is thinnest and inventory is already 12% under last year.
Expect it in the leading indicators first — inquiries, showings, days on market — with price following a quarter or two behind.
The single-pilot turbines are where the displaced Citation owner-pilots can legally land.
The number that should drive your decision
Our airplanes went from listing to closing in a median of 98 days last year. This year that median is 178 days, an 81% increase. Buyers take longer, financing takes longer, pre-buys are more thorough.
At that pace an airplane listed today closes in March, not December. The year-end buyer is the exception — he is working to a December 31 placed-in-service deadline and moves far faster than the median.
Work the calendar backwards from that deadline. From an accepted offer, 30 to 45 days covers scheduling the prebuy, the inspection itself, the acceptance window and then escrow and title. To close before December 31 the offer has to be accepted by about November 15. To have an offer in hand by then, the airplane needs to be in front of buyers by the end of October. That is the whole reason for the date.
Our closings this year came in a median of 4.8% under the ask the airplane carried when it sold, and 7.1% under its original list price. We reduce the ask; we do not haggle.
On the fence about selling? List by October 31
If you own a Meridian, M500, M600, JetProp, TBM, Epic, PC-12 or Vision Jet and you have been going back and forth, here is the case for the next three weeks.
The buyers are shopping now. The displaced Citation owner-pilots are working through their options this quarter, and what they can legally fly is close to that list. An October listing puts your airplane in front of them while the field is thin. A March listing puts it in the spring wave, beside every other owner who had the same idea over the winter.
We took a full-price offer on one of our single-engine turboprops after a week on the market.
The call is yours. The calendar is the part that is not negotiable.
The Epic E1000, one of the eight types a year-end buyer is shopping right now.
Turboprop inventory is 12% under last year, asking values have split, and the FAA ended single-pilot flying in the legacy Citations. What it means for Q4 2026 — and why October 31 is the date that matters if you are thinking about listing.
Talk about star treatment. The Lajitas Golf Resort rolled out the red carpet for the 2019 Texas Top Aviation Lajitas Fly In. I had been to Lajitas twice before; once in July when it was hot, miserable and bumpy. The second time was the week before our Fly In. Both times, everyone from the airport folks to the bus drivers to the front desk and restaurant staff were top notch. It made for a very pleasurable experience.
If you haven’t been out to Lajitas (or don’t even know where it is) and you’re a pilot (you don’t even have to play golf), you have missed a sure gem. Lajitas is positioned on the southern tip of the Big Bend area of Texas, right on the Rio Grande river. Lajitas has great lodging with several different room options from big to small, an excellent restaurant for 3 square a day (and even a bakery for sweets, coffee, and breakfast tacos in the mornings), and a 5 star golf course in Black Jack Crossing.
Why is this all relevant to us aviators? Lajitas has it’s own private airport, 89TE. Complete with a 5,500 foot asphalt runway, VFR conditions most of the year, and reasonable fuel prices, Lajitas is the pilot’s gateway to the resort and the entire Big Bend area. If you wait until the fall, a brand new, 7,000 foot concrete runway should be completed and an IFR approach should be available. An AWOS is in the works too.
The resort and airport are so far south, radar and radio coverage with Albuquerque Center is pretty poor below about 15,000 feet, and non-existent below 10,000 feet. This isn’t a big concern as any airplanes in the area should be on 122.9 and the airport manager will make contact with you, give you a weather report, and assign a runway.
Once you are on the ground, there will be a resort bus waiting to whisk you and all your friends to the resort for your getaway.
The 2019 Texas Top Aviation Lajitas Fly In was a big hit. We had 7 airplanes total: 5 Cirrus SR22s, 1 Piper Matrix, and 1 Citation M2. There were 15 attendees total, including 13 golfers. Everyone raved about the resort and the golf course. The only hiccup in the weekend was the cold front that blasted through on Friday afternoon, kicking up a lot of dust. Golfing on Saturday was windy too, but Sunday morning was absolutely perfect.
Thanks again to the folks at Lajitas for the star treatment!
Interested in participating in the next Texas Top Aviation Fly In? Contact Us or Sign Up for Our Newsletter and we will make sure you find out about the next one so you don’t miss out!
Talk about star treatment. The Lajitas Golf Resort rolled out the red carpet for the 2019 Texas Top Aviation Lajitas Fly In. I had been to Lajitas twice before; once in July when it was hot, miserable and bumpy. The second time was the week before our Fly In. Both times, everyone from the airport…
So the Word became human and made his home among us. He was full of unfailing love and faithfulness. And we have seen his glory, the glory of the Father’s one and only Son (John 1:14).
From the Texas Top Aviation family (Hank, Kelsey, Everett, Cooper, and Cord) to your family, we wish you a Merry Christmas! We are thankful for how the Lord has blessed us this year. We pray for blessings on your family this coming year.
Keep the wheel side down and the sunny side up!
Merry Christmas!
So the Word became human and made his home among us. He was full of unfailing love and faithfulness. And we have seen his glory, the glory of the Father’s one and only Son (John 1:14). From the Texas Top Aviation family (Hank, Kelsey, Everett, Cooper, and Cord) to your family, we wish you a…
I ran across the story about the Korean Air flight that crashed in Guam in the late ’90s the other day. It was a 747 that hit the side of hill about 3 miles short of the runway, killing most of the people on board. The flight was at night (arrival time was about 1:30am) and the pilot’s lost sight of the runway on a visual approach due to inadvertent IMC entry. They didn’t execute a missed approach soon enough, got too low, and crashed.
These were experienced pilots, mind you, who had flown into that airport a number of times. They were experienced enough to know when to execute a go around. There were several other factors that led up to the crash, but, ultimately, they lost sight of the runway due to inadvertent IMC entry.
To all the VFR pilots out there, what do you do if you accidentally fly into a cloud? It’s a lot easier to encounter inadvertent IMC at night, simply because you can’t see the clouds in front of you. It is no less dangerous during the day, either.
So, we’re going back to the basics today. What really is the best course of action for a VFR pilot when flying into a cloud? One option (and in my opinion, the best option) is to turn around. Immediately start scanning your instruments, execute a shallow banked 180 degree turn while maintaining altitude, and fly out of the cloud you just flew into. If you have an autopilot, turn it on immediately and let it do the turn.
What if you were descending or climbing when you encountered the inadvertent IMC? In this case, just reverse whatever you were just doing. If you were descending, climb. If you were climbing, descend. Caution is needed, though, as climbing or descending when flying on instruments for an inexperienced IFR pilot could lead to a greater chance of disorientation.
One thing that could assist in spotting those clouds at night is turning the cockpit lights down. This will allow you to see outside a little bit better and start to notice when those ground lights are disappearing.
Most VFR pilots only do instrument flying on flight reviews. That doesn’t lead to a very high level of proficiency, so go out and grab your instructor and tell him to put you under the hood once a month. You’ll be a better pilot overall for it.
IFR pilots, taking a note from the Korean Air flight; if you lose sight of the runway on a visual approach, especially at night, go missed and ask for the instrument approach procedure. Don’t try and duck down below the clouds as there may be a hill or a mountain directly below you.
I ran across the story about the Korean Air flight that crashed in Guam in the late ’90s the other day. It was a 747 that hit the side of hill about 3 miles short of the runway, killing most of the people on board. The flight was at night (arrival time was about 1:30am)…
Most VFR pilots only do instrument flying on flight reviews. That doesn’t lead to a very high level of proficiency, so go out and grab your instructor and tell him to put you under the hood once a month. You’ll be a better pilot overall for it.