Cirrus Electrical System Health

Pitch + Power = Performance

ByHank Gibson October 10, 2016October 17, 2016

My first chief flight instructor had an addage he would impart to his flight instructors when we began working at that flight school. “Pitch + Power = Performance” he would tell us. Then he’d glare at us and follow up with, “nobody teaches that right, so make sure your students know it.”

Now, having been a CFI for seven years, I would tend to agree with him. I have moved on from doing mostly primary training to transition training. Transition training is taking someone who is already a pilot and teaching them how to fly a different type of airplane. In jets, you get a type rating. In piston engine airplanes, there is no FAA requirement to go through any type of extra training as long as you are rated in category and class (eg. single engine piston). But, insurance companies know that Mr. Fresh Private Pilot can’t just hop from a Cessna 172 into a Cirrus SR22 or a Bonanza, so they require transition training before insuring those pilots.

What did my chief instructor mean when he imparted his wisdom? He was speaking about a particular phase of flight, the final approach phase, regardless of whether it’s a VFR approach or an IFR approach. The pitch of the airplane and the power setting of the airplane have to be utilized together to achieve the proper speed and descent rate (performance).

VFR

On the final approach leg of a VFR pattern, most piston engine aircraft are configured with landing gear down and flaps down in the landing position. This puts the airplane on the back side of the power curve in the region of reverse command. In the region of positive command, in cruise, for example, the more power you add, the faster you are going to go and, if you pitch up, you will go up and you pitch down, you will go down. But, they work together (if you point the nose down, you will accelerate unless you reduce the power); remember, Pitch + Power = Performance.

In the region of reverse command, the pitch controls the airspeed and the power controls your rate of descent, but, again, they work together. Let’s say the airplane is 5 knots above it’s approach speed on final. Initially, the pilot will need to pitch up slightly to bleed off that airspeed. The airplane will want to climb, so as he is pitching up, he’ll need to make a slight power reduction to stay on glide slope.

Alternatively, let’s say the airplane is high, but is on speed. The pilot will make a power reduction to descend to the glide path, but he’ll also need to pitch down to maintain the proper airspeed.

What you don’t want to do is this: if the airplane is high on final, don’t push the nose down to try and get down. This does cause the airplane to lose altitude quickly, but the airspeed increases quickly. With a higher airspeed, the airplane has a lot more energy to dissipate when it gets to the runway, meaning you’ll float longer which can lead to forcing the airplane down or using up too much runway and not being able to get the airplane stopped in time.

IFR

On an instrument approach, you are on the front side of the power curve. When trying to stay on glide slope, the power is controlling the speed of the airplane and the pitch is keeping the airplane on glide slope. This can be a little bit confusing for VFR pilots transitioning to instrument approaches as they are not used to being on the front side of the power curve.

Keeping in mind that Pitch + Power = Performance, let’s put the airplane above the glide slope on an ILS approach. In order to get down to the glide slope, the pitch needs to be lowered as much as needed (it’s always better to pick a pitch attitude to fly and see if it is working to bring the glide slope back to center. If it doesn’t work, pick a new one. Don’t just push the nose down until the glide slope moves) and the power needs to be reduced to maintain airspeed (again, pick a specific power setting). Once the glide slope centers, then the pitch will be raised slightly and the power will need to be increased to hold glide slope and speed respectively.

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.

Merry Christmas 2018

ByHank Gibson December 19, 2018December 19, 2018

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!

The Diamond DA62: The Ultimate Twin

ByHank Gibson February 9, 2016February 11, 2016

Late last year, the Diamond Aircraft Corporation announced a brand new twin engine, the Diamond DA62. At first glance, this is a pretty cool airplane.  It seats 7 passengers, spread out amongst 3 rows, with 2 massive doors, leading to an “SUV” type feel, according to Flying Magazine.  That is only one of the “neato” features of the Diamond DA62.

The thing that will make pilots believers is the fuel burn.  According to Flying Magazine, which did a test flight of the airplane, at 14,000 feet and 60% power, the airplane was only burning 12 GPH, but still doing 170 KTAS.  Remember, this is a twin.  That’s about the same as a normally aspirated Cirrus SR22 at the same altitude.

How does Diamond do it?  Jet A.  The company put two Austro AE330, 170 Horsepower, Jet A burning piston engines on the Diamond DA62.  You may say, well, yeah, at 60% power, that’s great, but I want to go places. How much fuel does it burn then?  Even at max continuous power of 95%, it’s still only burning 18.5 GPH total and cruising at 195 knots.  Paying Jet A prices, that’s pretty sweet.

The range on the airplane is quite nice too.  Again, according to Flying Magazine, the range with full fuel (86.4 gallons with aux tanks) is about 1,300 miles.  You can carry the whole family too, as the full fuel payload is 1,000 pounds.  Golf clubs?  No problem.  Just stick them in the nose.

The Diamond DA62 is probably one of the easiest twins to manage, engine-wise, too.  The Fully Automated Digital Engine Control (FADEC) system that Diamond installed leaves the pilot with only 2 power levers, instead of 6 on the typical piston twin.  All that needs to be done at cruise is set a percent power and the FADEC computer does the rest.

Need air conditioning, built in oxygen, and TKS?  Diamond can set you up.  The G1000 system complete with digital backup instruments is standard in the airplane.  What more can you really ask for?

If you haven’t figured it out, I really like this airplane and would be aching to fly it.  I enjoy the DA40 and have a good amount of DA42 experience, but I’d really like to hop in a Diamond DA62.

Read the whole Flying Magazine article here.

Sources:  Flyingmag.com