Cirrus Autopilot Check

The Importance of Density Altitude

ByHank Gibson August 14, 2018August 14, 2018

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.

FBO Etiquette

ByAndrew Robinson October 3, 2015

If you’ve ever been to Nantucket Airport during the summer, you’ll understand when I say that it is a crazy place. During the summer months, especially on weekends, the airport is visited by an endless parade of airplanes ranging from the smallest GA airplanes to the biggest private jets.

One sunny Sunday afternoon I was standing in line at the front desk of the Nantucket FBO when the ramp door opened and a very grumpy and entitled man walked in. The man marched right up to the front desk and barked a fuel order at the girl working there, which she mistakenly read back wrong. After yelling at her for her wrongdoing, he announced that he had flown in to go to the restaurant and stormed off to drown his sorrows in fish and chips. Although he was a jerk, his attitude got me thinking about FBO’s and everything that the people who work at them do for us pilots.

For anyone who may not know, FBO stands for Fixed Base Operator. FBO’s can be found at airports everywhere and their business is to provide services such as fuel, hangar space, and tie downs. Bigger FBO’s can offer more services including rental cars, food, maintenance, flight instruction, etc. FBO workers have the ability to make life really good or really miserable for pilots, and, it seems to me, we pilots have the same power over them. Based on my personal experiences and the experiences of some friends who have worked at airports around the country, here are some things to think about next time you taxi onto an FBO ramp.

I’ve divided this article into two sections:

• FBO Etiquette: What can we as pilots do to make life easier for the workers at the FBOs
• FBO Pilot Perks: Ways that FBOs can help make a pilot’s life better (besides basic services like fueling)

 

FBO Etiquette

Be Polite

Everyone I talked to about their time working at an FBO said that simply by being friendly and polite is one of the biggest ways we can help. Most of the people that work at the FBOs love aviation and likely are working there to be around the industry in hopes of eventually being more involved. The girl working the desk at Nantucket didn’t deserve to be yelled at just for reading a tail number back wrong; don’t forget that “please” and “thank you” are still magic words.

Call Ahead

Whether you are flying to the airport, or you left your airplane at the FBO and you need them to pull it out or fuel it, calling ahead is greatly appreciated. Most FBO’s have a radio at the front desk and have their frequency listed online and in foreflight. Call ahead and tell them that you’re coming, when you’ll be arriving, and what you’ll need when you get there (gas, rental car, taxi..etc). That way they wont feel rushed and you may get what you’re looking for more expediently upon arrival.

Fuel orders

If your fuel order is difficult or confusing (example: 6.54 gallons in the right side and 4.32 in the left) you may be better off just to do it yourself at the self serve. One of the guys I talked to said that he would have pilots ask for extremely specific numbers and then stand there watching, ready to pounce when it wasn’t fueled exactly right. Its also worth noting that fuelers do make mistakes. Its highly recommended to watch and make sure that the correct truck (Jet A or 100LL) is the one pulling up to dispense your gas. Make sure you check that the fuel caps are properly installed before departing. 

Look outside

Taxiing onto the ramp is not the right time to be doing your after landing and shutdown checklists. Wait until the airplane is stopped before taking your eyes off the person marshaling you to your parking spot. I’ve been told that it isn’t uncommon for a pilot to be looking inside while taxiing and it makes the linemen very nervous as they are motioning to the pilot to stop (For those unfamiliar, with lineman hand signals, here’s a helpful link).

Brakes

Unless you have talked to them and get the okay, don’t leave the parking brake on when leaving your airplane at an FBO. Often the lineman will direct you to park upfront to make loading and unloading easy, but if you’re going to stay for a long period, the airplane will need to be towed and parked out of the way. Leaving the parking brake on can make serious headaches for the people trying to organize the ramp after you leave.

Lights

Don’t blind the poor guy parking you by leaving all your landing, taxi, and recognition lights on as you’re pulling into your spot at night. Likewise, when you are ready to leave your parking space, its courteous to signal the person waiting in front of your airplane by flashing one of your lights at them so they know you are ready to be directed off of the ramp.

FBO Pilot Perks

Good parking

This one is pretty basic. I’ve heard through the grapevine that you may get parked in the boondocks as punishment for being rude to the FBO staff. However, if asked, much of the time they can pull your airplane right up front and may even let you pull a vehicle onto the ramp to load people and bags more easily.

Cheaper hotel rooms/ rental cars

Some FBO’s have special rates with hotel and rental car companies around in the area. Although it varies from place to place, you may be surprised with the amount you can save on these travel essentials. I had a flight last week where I called and was given a quote of 185 dollars for a rental car…after telling them that I was parking at the local FBO, I got the special price of 125. Check with the FBO you will be stopping at for any of their current offerings.

Fuel discounts

Sometimes the price of fuel or the minimum uptake to waive the fees can be negotiated.  Sometimes, the fees may be forgotten entirely. If you are unable to take the minimum amount of fuel to waive the landing or ramp charges, tell them what you can take and you may be pleasantly surprised with the response. Its not uncommon with our Bonanza that even though the “minimum” may be 20, I can waive the fees by up-taking 10 or 12 gallons instead.

Points/ Rewards cards

Some FBO’s offer incentives to pilots for buying gas. Many of the rewards programs are free to sign up for and will pay the fuel purchaser cash based on how much fuel they buy over a specified time period.  I am a member of the Avtrip program which rewards fuel purchases at Avfuel airports with points that are redeemable for money. Avtrip is just one example of an FBO fuel rewards program; if you fly regularly, it may be worth looking into whether or not there is a fuel rewards program you can take advantage of.

Crew Cars

Most FBO’s have cars designated for use by the pilots. They are extremely nice for going to get lunch or taking care of whatever short errands you may need to run around town. Most crew cars are limited to about 1-2 hours of use, but they can often be loaned out longer based on the discretion of the people working the desk. On a few occasions, I’ve had the cars loaned to me for longer, even over night, by the nice people at the FBO (They always appreciate pilots splashing a few gallons of auto gas into the cars while they are out, too).

FBOs and the services that they provide are invaluable to pilots, both commercial and private. If we as pilots are willing to work with the linemen and service reps we can make both our lives and their lives easier. Remember to be polite and don’t be afraid to ask if you need something….that’s what they’re there for!

Andrew Robinson is a 135 Charter Pilot and flight instructor who lives with his wife and 2 daughters in Pennsylvania.  He flies Pilatus PC-12s and instructs in Beechcraft Bonanzas.

Wind the Clock

ByMike Hostage July 26, 2016

There is truth in the old adage that 99% of flying is routine while the remaining 1% holds the potential for events that cause those who fly to hold themselves above mere ground-bound mortals. My 37 years of military flying might have distorted that ratio a fair bit given the complexity of high-energy fighter aircraft and the uncertainties of combat, but rest assured we all earn our right to be proud of our wings every time we fly.

The requirement that a single-seat fighter pilot be able to handle rapidly evolving emergency situations and complex systems diagnosis sets a high bar for any who join that group. However, the lessons we learned and techniques we developed for making fighter aviation significantly safer than in yesteryear have direct applicability to general aviation.

Prioritization and compartmentalization are two important skills that every pilot should have. These skills amount to the ability to look at a complex problem, quickly determine the most critical elements, and mentally set aside those things that can wait so as to deal with highest priorities first. While this does not sound like rocket science, the art is in the doing!

The technique for dealing with the immediate onslaught of information, such as when that caution tone or caution light presents and different gauges or displays go haywire, provided the title for this piece.

All flight training will, at some point, involve what is called situational emergency procedures training, know to military aviators as SEPT. We do this type of training in a simulated cockpit that has all the dials and switches for our particular aircraft. None of the switches and dials do anything, some are just decals on a wooden dashboard, but the presentation allows the SEPT victim to reach for the appropriate switch or lever, while telling the instructor what and why they are doing so.

One of the most common mistakes new trainees make is that of trying to act too fast, before they have fully and correctly analyzed the situation at hand. Herein lies the titled technique. After blurting out a quick and incorrect answer, the instructor would admonish with: “rather than try to react instantly, maintain aircraft control, analyze the situation, then take appropriate action. The best thing you can do is to reach up and wind the clock. This will give your nervous energy some place to channel itself, while your brain takes in the full situation.”

Winding the clock might seem like an archaic notion, but, amazingly enough, even our most modern aircraft have the same clock we flew with as far back as the 1960s. The Waltham A-13A aircraft clock and timer is a wind-up device that only uses power to light up at night. Unless your emergency involved some type of catastrophic impact to the instrument panel, you could count on at least your clock to be functioning normally. Thus, reaching out and winding it was unlikely to cause any worsening of your evolving emergency and would distract your brain from the need to take some poorly-thought-out action, too quickly.

Now, in most aircraft there are a few emergencies that will require immediate, reactive actions. In fighters, we call these Boldface Emergencies. For each type of fighter, we memorize, to the letter, the few key actions that have to be instinctive, to prevent disaster. For all other emergencies, there is time to reach out and wind the clock while assessing all instruments and lights to fully understand your situation.

For your aircraft, know those Boldface or Critical Action Procedures, but for all other emergencies, take the time to maintain aircraft control, “wind the clock” while you analyze the situation, then take appropriate action.

Mike Hostage is a retired USAF pilot with 37 years of experience, flying a wide variety of aircraft.  An instructor pilot for more than half of his 4800 flight hours, Mike is currently qualified in a Cirrus SR-22T and regularly flys his two homebuilt sailplanes.

TBM Debuts the 960 at Sun N Fun

ByHank Gibson April 15, 2022May 1, 2022

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.

About Daher – www.daher.com