Avidyne Vantage

Cirrus Autopilot Check

ByHank Gibson May 26, 2015June 3, 2015

In the Pre-Takeoff Checklist for any Cirrus aircraft, it calls for pilots to perform a Cirrus Autopilot Check.  It is prudent to check the autopilot before your flight to ensure that all aspects of the autopilot are working properly.  The only problem is, the checklist doesn’t spell out how to perform the Cirrus Autopilot Check.  You would have to go to the POH for the airplane, which is usually in the back seat or a bag somewhere and therefore hard to get to, in order to find the procedure.

The procedure for checking the autopilot is slightly different depending on what autopilot is in your airplane.  The procedures for all three are below.

S-TEC 55x

• Sync the heading bug to your current heading
• Activate heading mode on the autopilot
• Twist the heading bug left and right to ensure the ailerons move left and right
• Sync the heading bug to your current heading
• Activate vertical speed mode on the autopilot
• Move the vertical speed bug (or the vertical speed on the altitude pre-selector if you have a steam gauge Cirrus) up and down to ensure the elevator moves accordingly
• Ensure you can overpower the autopilot
• Press the autopilot disconnect switch to ensure the autopilot shuts off

Avidyne DFC 90

• Press the AP button to activate the autopilot
• Ensure AP, ROLL, and PITCH Annunciations are depicted in green on the top of the PFD
• Set the heading bug 90 degrees from the current heading
• Press the HDG button on the autopilot
• Ensure the ailerons are moving in the proper direction and HDG is annunciated on the top of the PFD
• Ensure you can overpower the autopilot
• Press the autopilot disconnect switch on the stick and ensure the autopilot has disconnected

Garmin GFC 700

• Press the AP button to activate the autopilot
• Ensure you can overpower the autopilot
• Press the autopilot disconnect switch on the stick to ensure the autopilot has disconnected

An Educational Runup

ByHank Gibson July 23, 2020July 17, 2020

When a pilot thinks of an engine runup in a single engine piston airplane, typically it is let’s find out if the engine is running rough or not, meaning a spark plug is fouled.  Believe it or not, there is a little more to learn from a runup than just checking the spark plugs.

A distinct advantage to having an engine monitor that monitors all EGTs and CHTs is you get a better idea of engine health.  When switching to one magneto or the other during the runup, all the EGTs should rise, showing that the temperature of the exhaust gas is going up from each cylinder.  This occurs because when running on only one magneto and one set of spark plugs in each cylinder, the mixture takes longer to burn, so, when the exhaust valve in the cylinder opens, the burn is still on going and this hits the EGT probe, causing a temperature rise.  An indication of a magneto failure in flight would be a rise in all the cylinders EGT without a change in mixture setting.

Now that we know what to look for when checking each magneto, what would one look for to show that there is a problem?  The basic that each student pilot is taught still applies.  The engine manufacturer puts a limit on RPM drop during the runup.  When checking one magneto or the other, watch for an excessive RPM drop.  If the RPM drops past the limit, this usually will be accompanied by engine roughness.

Why is that?  Let’s look at the cause for the excessive RPM drop.  For this, we need to go back to our EGT indicators.  Let’s say we have a 6 cylinder engine.  When the key is turned to the right magneto, the RPM drops 250 RPM and the engine gets very rough.  Look at the EGT gauge.  The cylinders where the spark plugs are firing normally will all show a temperature.  The cylinder (or cylinders) where there is no combustion, meaning a bad plug, will show no temperature.  This is because the mixture is just sitting in the cylinder and not igniting, therefore, no exhaust gases will be pushed out so there will be no EGT indication for that cylinder.  This is also how you tell a mechanic which cylinder to check for the bad plug.

It could also be a bad magneto.  If multiple cylinders EGT all drop, or the engine wants to quit entirely, you have a bad magneto or bad ignition harness.

What else can you learn during the runup?  Electrical system health is key, especially in all electric airplanes (meaning no vacuum system).  It’s a very good idea to turn on all the lights and pitot heat to ensure that a rise is indicated on the ammeter.  This means the alternator is carrying the load and working properly.

The next time you do your runup, keep an eye on your EGT to see the rise during a magneto check.

Winter Ops

ByAndrew Robinson August 10, 2015August 19, 2015

It’s summertime and the weather is hot! Over this dry, sunny season, winter flying is probably the last thing on your mind. However, now is the perfect time to start getting things in place for winter and that includes having a plan for taking care of your airplane.

Why are preparations for winter ops needed in the first place? Cold weather, especially during the engine start and warm up period, can be very damaging to your engine if precautions aren’t taken to ensure that safe temperatures exist inside the engine before you turn the key. I always thought that the biggest problem associated with cold weather was engine oil. The logic is since cold oil is thicker and less viscous as the temperature drops, it is not able to circulate quickly throughout the engine to provide proper lubrication upon starting.

While cold oil may be a factor, the introduction of multi­viscocity oils has greatly reduced that issue. The real problem is created by the different ways that various parts of the engine respond to heat. Because aluminum expands more quickly when heated than steel does, the pistons (made of aluminum) expand more quickly than the cylinders (made of steel). This can lead to scuffing on the sides of the cylinder barrel. In the same way, differential heating can reduce clearances which are designed to provide cooling oil to bearings and other vital engine parts, thereby causing damage which greatly reduces the life of the engine.

So how cold is TOO cold? Unfortunately, that is a difficult question to answer. Because there is so much variation between engines, airplanes, and environments, there really isn’t any one specific answer. An older, more worn out engine may actually be less susceptible to cold weather damage than a newer, tighter engine because its internal clearances are probably not as tight as they were a few thousand hours ago. I have heard of some people who preheat their airplanes anytime the temperature falls below about 40 degrees. For us northerners, this seems excessive. On our E33A Bonanza which has a Continental IO­520, we generally preheat the airplane when it is cold soaked in temperatures below freezing (32° F).

Here are a few of the best ways to get your machine ready for a cold weather flight:

• Heated Hangar:­ Nothing beats a heated hangar for warming up an airplane. The warm air is evenly distributed around the engine and in the cockpit (your avionics and gyros will thank you!). The airplane will need to be in the hangar for a while in order to warm up the guts of the engine. Often, the easiest way is to have the airplane pulled in the evening before the planned departure and left overnight. Many FBOs will hangar airplanes overnight for a small fee and it is well worth the price. We almost always have our charter airplanes put into hangars overnight when on a winter trip to ensure that we don’t have any trouble when we depart the next day. This practice has the added benefit of keeping the airframe clear of any ice and snow that may accumulate before you are scheduled to leave.
• Electric Engine Heaters­: Multi­point electronic heaters use heating pads that are placed around the engine in order to heat up the various components such as cylinders, the oil pan and crankcase. Most of these systems are designed to be activated by being plugged into a wall outlet with an extension cord. Preheating for a winter flight is as simple as going to the airport the night before and plugging it in. Two well ­known manufacturers of multi­point engine heaters are Reiff and Tanis. These systems are relatively inexpensive and can be a life saver if you regularly travel in colder climates. If an engine heater is the right choice for you, it is recommended to avoid less ­expensive models that heat only the oil pan.

• Covers and Blankets­: If it is especially cold or you have to preheat outside, having something to insulate the cowling and keep the wind out can be very useful. Regular blankets will work long as you can secure them in place. If you have an ongoing need for additional insulation, there are companies that make custom blankets and propeller covers to fit your airplane. If you are landing and then taking off again relatively quickly, using a few blankets and cowl plugs will work nicely to keep the engine warm while it is sitting outside. In a pinch, placing a couple of powered light bulbs in the cowling overnight with insulation on top can result in sufficient temperatures for starting the engine.

• Forced Air:­ This method is used widely by FBO’s and flight schools. Hot air is produced in a portable heater and is then pumped into the engine compartment via the openings at the front or bottom of the cowling. This method has the benefit of not requiring any additional equipment to be installed on the aircraft beforehand and can be very effective provided there is adequate time for the engine to heat completely before removal.

• Winter Baffles:­ When the air temperature starts to drop into the teens and lower, you may find it difficult to keep your engine temperatures warm enough in cruise flight. The problem is that the air entering the cowling inlets is so cold that it overcools the engine. The solution is to install additional baffling in the engine inlets to reduce the amount of airflow into the cowling. These additional baffles are usually just sheets of aluminum that are cut to the correct size and are bolted in and removed quickly and easily as needed. Some pilots swear by them while others complain that they can cause uneven cooling. If you have questions about winter baffling, I’d suggest talking to your mechanic about your specific airplane.

Winter flying can be extremely rewarding. After their hands thaw from pre­flight, a pilot is often rewarded with smooth air, improved performance and outstanding views. Just don’t forget to prepare the airplane for the cold. The preparation is often as simple as plugging in an extension cord or making a phone call to the FBO. So whether you live in the north or the south, take good care of your engine so that it can keep taking good care of you.

AOPA Rusty Pilot Seminar in San Marcos

ByHank Gibson June 21, 2016July 7, 2016

“AOPA Rusty Pilot presented by AOPA Ambassador Pat Brown at Tempus Training Solutions”
Topic: A Rusty Pilots Seminar
On Saturday, July 16, 2016 at 09:00 Central Daylight Time
Location:
Tempus Training Solutions
2080 Airport Dr.

San Marcos, TX 78666

Select Number:
EA2769634

Description:

Life may have gotten in the way, but the dream of flight can be yours again. Returning to the skies is not as difficult as most rusty pilot think. We’re inviting you back in the cockpit and will help you get there. Come and participate in a FREE Rusty Pilot program with fellow lapsed pilots. We will help you understand what’s changed in aviation since you’ve last took the controls and brush up on your aviation knowledge. The Rusty Pilot program is developed by AOPA in partnership with local flight training providers in order to create the best environment for getting you back in the air and a part of the general aviation community.

It is easier than most people think:

• No FAA checkride or test
• Medical may not be required

As a Bonus, by attending, you get two to three hours of free ground instruction towards your flight review!

Register Now!

https://ww2.eventrebels.com/er/Registration/StepRegInfo.jsp?ActivityID=16910&StepNumber=1

To view further details and registration information for this seminar, click here.

Skyvector Has a New Look

ByHank Gibson July 26, 2015August 20, 2015

Skyvector has changed it’s look.  The aeronautical chart website is now offering flight plan filing capability. In order to gain the ability to file flight plans, the user has to form an account first.

Personally, I really liked how Skyvector had a simple interface before they changed.  As an instructor, a lot of times, I go to multiple airports on one flight.  It was really nice to just plug in airport IDs to check distances and heading information on Skyvector.  The new format is a little clunky as the website has made it a little more difficult to do what it did best before.

Did the aviation community need another venue to file flight plans?  Not with Foreflight, Garmin Pilot, and WingXPro leading the way in the app market.  Skyvector was smart in not trying to develop another app to compete with the big boys.

Will the new Skyvector last?  We’ll see.  I’m hoping they’ll go back to the way they used to be, but we’ll see. I may use it enough to come around to liking it.