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.
Field Condition, or FICON, reports show up in NOTAMs both during the summer time and the winter time. In the southern states, FICON reports are seen more in the summertime during and after hard rains and thunderstorms (with the exception of winter 2021 & 2022, where Texans quickly got familiar with FICON reports after some very unusual winter weather). In cold winter climates, FICON reports are a staple during the winter season, showing up during and after snow & ice storms.
The question is, what do those codes mean in the FICON report? You could see 5/5/5, 3/3/3, 3/4/4 and any combination thereof. And why are there three numbers?
Let’s start with the second question first. The three different numbers in the FICON report indicate the 3 different sections of the runway: the touchdown third, midpoint third, and rollout third of the runway.
Now, what are those numbers describing? The three numbers are the indication of how slippery that portion of the runway is. This is referred to as a Runway Condition Code (or RCC). The lower the number, the more slippery the runway is. The higher the number, the dryer the runway. The scale is 0-6, with 6 being completely dry and zero being no traction at all.
Here is the FAA table for the RCCs.
Now, in order for those RCC codes to generate, at least 25% of the surface must be wet. If there are just spots of standing water, slush or snow, a FICON report will be issued to report the contaminants, but no codes will be generated.
The Runway Condition Codes are only part of a FICON report. In addition to the codes, a descriptor in the NOTAM will be published describing what percentage of the portion of the runway is affected and by what.
For example: RWY 28 FICON 3/3/3 100 PRCNT 2IN DRY SN OVER COMPACTED SN.
Deciphered, that is saying that all sections of Runway 28 have braking deceleration that is noticeably reduced or direction control is noticeably reduced and 100% of each section has 2 inches of dry snow over compacted snow. Sounds like a runway to avoid!
Braking action reports are separate from FICON reports, but also issued via NOTAM. Braking action reports are issued by the airport manager whereas the FICON reports are computer generated.
Are you still trying to master the Garmin 430 in your airplane? Is it giving you fits because you keep twisting the big knob instead of the small knob? Would you like a step-by-step guide to each and every part of the Garmin 430?
Pilot proficiency website PilotWorkshops.com has published a very thorough, step-by-step manual on how to use the Garmin 430. Want to load a flight plan? There’s a section for that. Want to load an approach? There is a section for that as well.
The Pilot-friendly Garmin 430 manual is a great reference to have for Garmin pilots. Pilot Workshops offers a guide for the Garmin 430 and the Garmin 430W, depending on if you have WAAS or not.
The hard copy guides are $44.95, but you can also download the PDF version of each for $19.95.
To get more information on the guide or to order one, you can visit the Pilot Workshops website. (Have another Garmin or King GPS unit? Pilot Workshops has guides for a variety of different GPS units)
The AOPA’s Air Safety Foundation will be returning to Texas this coming week with their After the Crash: Surviving An Aircraft Accident seminar. Though aircraft accidents are rare to most pilots, they still happen. It is best to be prepared with the proper knowledge and supplies in case you are stranded in a remote area while awaiting help to arrive.
The seminar will cover the following items:
How and what to pack in a survival kit
Ways to help search parties find you
What to do first immediately after the off airport landing
How to survive will awaiting rescue
The seminar will be put on in Houston, San Antonio, and Austin on three consecutive nights, the 20th-22nd, so everyone will get a chance to attend. The location and times are below.
No signup is necessary, just show up and be ready to learn. The seminar does count for WINGs credit and there will be a sign in sheet at each event.
The AOPA Air Safety Foundation puts on numerous seminars throughout the country during the year covering a wide variety of topics relevant to general aviation pilots. The content is always interesting and the presenter always knowledgeable and entertaining. Hope to see you there!
Tuesday, January 20th
Wyndham Hotel, Houston West
14703 Park Row Blvd.
Houston, TX 77079
7:00pm-9:00pm
Wednesday, January 21st
Doubletree Hotel, San Antonio Airport
37 NE Loop 410
San Antonio, TX 78216
7:00pm-9:00pm
Thursday, January 22nd
Omni Hotel, Southpark
4140 Governor’s Row
Austin, TX 78744
7:00pm-9:00pm
For more information on the event and the locations, please click here.
I got the privilege of going to the EAA AirVenture at Osh Kosh this year. It was my first Osh Kosh experience. I’ll be the first to tell you, walking in the gate on the first day is mildly overwhelming. There are people and stuff everywhere. Airplanes, tents selling everything from airplane parts to mattresses (I wasn’t really sure how mattresses tied to flying), vendors, colleges, and loads of people.
Photo Courtesy of William Day, copyright 2018, All Rights Reserved
After I gathered myself from my initial shock, I set out to explore all that I could. I spent most of the first morning walking around the different manufacturer’s tents, getting a gauge on all the new airplanes I could never afford and only hope to ever fly.
The short of it is, the Cessna/Textron Denali is going to be stellar once it gets completed. The Epic E1000 (if it ever gets certified) might take a large market share from TBM, though they will have an uphill climb. The Cirrus Vision Jet is very cool and should be a relatively simple step up for SR22T owners. The Pilatus Jet is huge. Finally, the Diamond DA62 would be my below 12,500 airplane and the Piper M350 would be my pressurized plane. Money being no factor, of course.
Photo Courtesy of William Day, copyright 2018, All Rights Reserved
I decided to take in the entire airshow on Day 1, all 4 hours of it. Upon realizing I would be very stiff necked if I did that each day for the three days I was there, I decided on Day 2 to check out some seminars and learn something. I took a seaplane ground school course on Day 2, then listened to a NASA presentation on electric airplanes and low boom sonic jet technology (how to make supersonic passenger flight quieter).
The end of Day 2 at Osh Kosh had to be the highlight. I got to hang out with Cub Crafters at the 51WI grass strip just north of the OSH Class D airspace. There was a free BBQ and I got to take a ride in a Carbon Cub. My landing from the back seat was a bit rusty, but still a very cool experience. Buzzing the BBQ area in tandem was pretty neat.
Photo Courtesy of William Day, copyright 2018, All Rights Reserved
Day 3 brought some cooler temps and some clouds. We walked out to the vintage airplanes, spending the morning gawking at Cessna 195s and Wacos. Then I took the plunge to explore all the vendor hangars. My idea was to walk around and see if I can find some interesting and innovative technology. Well, after 2 of the 4 hangars, my head was spinning, so I decided to watch the rest of the airshow to let my brain drain out a bit.
Photo Courtesy of William Day, copyright 2018, All Rights Reserved
3 Days was a good amount of time to spend. I don’t think I could have stayed all week, but only a day or two wouldn’t have been worth it. I flew up with a former student in his TBM 700, which was a very nice way to travel. We landed and stayed in Green Bay (KGRB), which was super easy and low stress. Had a great tailwind on the return and made it to Houston non-stop.
A few closing observations:
The Stratos 716X Personal Jet
If Stratos Aircraft is ever able to bring this to market, it sounds awesome. 400 knots, single engine, single pilot, with 6 seats. Being a single engine jet, similar to the Cirrus Vision Jet, it’s 100 knots faster, plus with the airflow and engine technology, it doesn’t have that big V Tail in the back, thereby reducing drag. I have a feeling it would find a good market, but the certification process is a bear to get through. Just ask Epic.
The Lancair Mako
This is a legit airplane. Lots of thought was put in to the design of the Mako by the new Lancair organization in Uvalde, TX (KUVA). The airplane was extremely comfortable, capable, and pretty cool. The stick is in the center, with throttles on the side (where the stick would be in a Cirrus or Columbia). AC, full Garmin integration, and the cool factor of the nose gear retracting, but not having a gear handle. Higher useful load than a Cirrus or Columbia, it would be a great alternative (and cheaper) to one of it’s certified competitors.
Avionics
There is a lot of new avionics technology hitting the market. Dynon, beloved by experimental enthusiasts, is finding a foothold in the certified world with some neat panels. It will be an uphill battle to take on Garmin, but there is some potential in the retrofit market to offer a cheaper alternative to the Garmin TXi.
Speaking of the TXi, I played around with the 10.7″ panel at the Garmin booth. It is extremely intuitive. Garmin did a great job of making it a simple touch screen interface, easy to use, and easy to learn.
Avidyne is pushing their iPad integration with the IFD 100 iPad app. It ties via Wifi or Bluetooth to an IFD 550 or 440 navigator, giving an additional screen in the cockpit to work with. You have the ability to modify flight plans and such on the iPad and it will show up on the GPS units.
Photo Courtesy of William Day, copyright 2018, All Rights Reserved
All in all, Osh Kosh was an experience I’m glad to have finally experienced. I don’t think I would go every year like some folks, but every few years, especially when my sons are older, seems like just enough for me, but not too much.
All Photos Courtesy of William Day, copyright 2018, All Rights Reserved
Want to make it better than a Cirrus or a Cessna TTx?
Meet the team at RDD creating the LX7. Just make sure you are sitting down as you are about to be blown away.
RDD (Research. Design. Development) is a professional building company for the Lancair line of experimental aircraft (Lancair unveiled the Mako at Osh Kosh this summer, which performs slightly less than the advertised values of the LX7, but is available as a new kit). For those unfamiliar with the experimental world, when an experimental kit is bought, the owner/builder can build the entire aircraft himself, partially build it then send it to a completion center, or have a professional build company put it together. This last option is what RDD did with Lancair aircraft before Lancair moved from Oregon to Uvalde, TX.
Once Lancair was sold, RDD started thinking on how to make the IV-P better. Boy, did they. What resulted is the LX7.
The LX7 is a retractable gear, single engine piston, pressurized aircraft that sits 4. See it on the ramp and it looks like a Lancair or a Columbia. Sit in the cockpit and you’ll know something is different.
Starting with the power plant, RDD put a Continental TSIO 550-E engine in the IV-P airframe, giving the airplane 350 HP. They redesigned the wing to hold 180 gallons of usable fuel and a much better stalling envelope (anyone who has looked at a Lancair IV or IV-P wing knows that there isn’t much wiggle room with angle of attack on those airplanes), lowering the stall speed to 62 knots dirty.
The cabin is roomier and the panel is beautiful. Equipped with 2 or 3 Garmin G3X Touch panels (the experimental equivalent of the G2000), plus a GTN 750 and a fully digital backup flight instrument from Grand Rapids, plus ESP technology built in to the autopilot, this plane seems like a pilot’s dream.
I haven’t even gotten to the best part: the speed. Being pressurized, the LX7 has a 25,000 foot service ceiling where it can achieve cruise speeds of 260 knots at best power (24 GPH) and 250 knots at best economy (18 GPH).
Yes, I did just say 250 knots at 18 GPH in a single engine piston.
Worried about an experimental? The airframe is equipped with a full BRS system similar to the Cirrus SR22, keeping everyone safe and sound.
There is one flying LX7 currently and RDD is working on 3 more. The price tag for the full conversion is $550,000. The kicker is, the owner has to provide the Lancair IV-P airframe. There are currently 10 Lancair IV-Ps for sale on Controller, varying in price from $200,000-$400,000, bringing the total price of the project to $750,000-$950,000. Owners who already have a IV-P or a IV-P kit can send it on over to RDD to get started on their project.
I recently purchased the new, wireless, Lightspeed Tango headset. I’m a little OCD, so when a headset wire is banging against my shoulder while I’m trying to tune a radio or point something out, it’s a little annoying. A headset without the wires caught my eye.
As I’ve stated before in a previous article, I really like Lightspeed headsets. They are more comfortable than Bose, and a little bit more affordable too. The noise canceling quality is very high in the different Lightspeed models. I personally believe it got even better with the Lightspeed Tango.
Let’s talk about the obvious first. Not having a wire connecting you to the headset jacks is really nice. You’re not tethered to anything, so your head is free to move anywhere without getting yanked back in place. Lightspeed developed a new technology, called Lightspeed Link, which bypasses Bluetooth or Wifi and connects the Panel Interface to the headset wirelessly.
The Link technology works pretty well. The only problem I have noticed is in certain airplanes, I occasionally lose one ear, but after I wiggle the input wires around, the deaf ear comes back up. It may be a loose connector in the plane itself.
The really nice thing about the Lightspeed Tango is the fact that it doesn’t need AA batteries anymore. Lightspeed put rechargeable lithium ion batteries in both the Panel Interface and the headset. You get 12 hours of battery life out of both, far surpassing any length of time you would want to be in an airplane. If the battery dies, there is a handy aux cable that can connect the Panel Interface directly to the headset (the ion batteries recharge with the included wall charger and USB cables in 2 hours).
Though the Lightspeed Tango is slightly heavier than the Zulu 2 due to the Link hardware and the lithium ion battery, it is still extremely comfortable. The ear cups actually fit better over my ears and give me a better seal with glasses on then the Zulu 2 did. As with all Lightspeed products, there is no squeezing of my head and the cushions on top of the headset sit very comfortably on top of my head.
The Bluetooth is much simpler to use than the Zulu 2 and definitely simpler than the Bose A20. Sound quality is very good for phone calls and music. The volume control on the headset itself is set to make smaller adjustments so you don’t have to deal with wide swings in volume.
Overall, I’m a big fan of the Lightspeed Tango. I am recommending them to all the pilots I talk to. Rolling in at $400 cheaper than the Bose, you can’t go wrong.
