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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.

Cirrus Alternator Failure

ByHank Gibson April 27, 2018May 1, 2018

A Cirrus is an electric airplane.  There are no vacuum pumps and therefore no vacuum driven instruments. The Klapmeier brothers did this on purpose, trying to make it a modern airplane.  No vacuum systems means no vacuum pump failures, hence there is a lower likelihood of instrument failures in IMC.

What Cirrus did instead was put a lot of electricity producing and storing devices in the airplane.  All SR20 and SR22s are equipped with 2 engine driven alternators and 2 backup batteries.  Alternator 1 is a 28 volt alternator (the amperage varies based on whether or not you have an air conditioner) while Alternator 2 is a 28.5 volt alternator.  There are 2 24 volt backup batteries, as well.  Battery 1 is also used for starting.

In traditional airplanes that have 1 alternator, an alternator failure can affect a lot of things.  Depending on how many electronics are in the airplane, the battery can get depleted quite quickly.

The Cirrus electrical system is quite ingenious.  It’s a little bit different based on whether you have an Avidyne Cirrus or a Garmin Perspective Cirrus.  I will discuss that further below.

The main goal of this article is to talk through what happens in the event of a #1 Cirrus Alternator Failure (an Alternator 2 failure actually isn’t a big deal at all, though Alt 2 is required for IFR flight), the procedure for trying to fix it, and a technique I have developed that makes the pilot’s job easier.  First, let’s go through the #1 Cirrus Alternator Failure procedure.

Alternator 1 Failure

In either avionics configuration, the Cirrus Alternator Failure procedure is the same.

• Check and reset the circuit breaker for Alternator 1 (Reset only once)
• Cycle the Alternator 1 master switch
• If Alternator 1 doesn’t come back online, leave the Alternator 1 master switch off and shed load on the battery

Avidyne Entegra

The Avidyne Entegra has 2 busses, the Main Bus and the Essential Bus.  Alternator 2 isn’t set to come on until the engine RPM reaches 1700.  While on the ground, Alternator 1 runs both the Main and Essential Buses.  In the air, Alternator 1 runs the Main Bus and Alternator 2 runs the Essential Bus.  Since Alt 2 is 28.5 volts, the higher voltage won’t allow the power from Alt 1 to cross over and run the Essential Bus.  There are also 2 one-way directional diodes that prevent the voltage from Alt 2 to cross over and run the Main Bus.

Having said all that, when Alternator 1 fails, Battery 1 is now running the items on the Main Bus.  There are a significant number of items on the Main Bus which causes the 24 volt battery to quickly lose it’s charge. This precipitates the need for shedding load.  Items like GPS 2, the air conditioner and aircraft lights can all be turned off.

In the above scenario, Alternator 2 is running the Essential Bus still that has all the Essential items on it.  Those include:

• The PFD
• Flight Instruments and associated Avidyne computers
• Engine Instruments and associated Avidyne computers
• GPS 1
• Com 1
• Nav 1
• Autopilot
• Stall Warning
• Charging Battery 2

Note 2 important items that are not on the Essential Bus:  the flaps and the landing light (which is very handy at night).  Those two are only on the Main Bus, which Battery 1 is now powering.

Let’s further enhance our scenario.  You are flying over Nevada (quite remote and not a lot of airports) at night, 30 minutes from the nearest airport when your Alt 1 fails.  When you get to the airport you are planning on landing at, you want to have your flaps and your landing light, but we don’t know how long Battery 1 will last.

The solution (this is where my technique comes in):  Turn off the Battery 1 master switch.  This is an easy solution to ensuring you have battery power to use your flaps and landing light.  Instead of going through and shedding load, simply turn off the source.  You’ll still have all the above items on the Essential Bus, which is all you need to keep safely flying.  Then, when you get to your landing airport, turn Battery 1 back on to utilize your flaps and landing light.

Garmin Perspective

Cirrus wired the Garmin Perspective plane a little bit differently.  There are now 2 Main Buses along with the Essential Bus.  Alternator 1 runs Main Bus 1, while Alternator 2 runs Main Bus 2 and the Essential Bus. Both Alternators are running all the time.  The Alternator 1 Failure procedure remains the same.

The cool thing that comes along with the second Main Bus in the Perspective is the amount of items you still have available to you in the event of an Alternator 1 failure.  The only items you lose will be:

• Yaw Damper
• Landing Light
• Air Conditioner and associated components
• EVS Camera
• 12 Volt power supply in armrest

Everything else is powered off of Alternator 2.  That’s not much.  The only item you really want on the above list is the landing light if you are going to be landing at night.

Follow the Alternator 1 Failure procedure, then do my technique again.  Turn off Battery 1 to save the battery power in order to use the landing light when needed.

Cirrus did a great job creating an all electric airplane with plenty of backups in case something fails.  I focused mainly on the Alternator 1 failure here.  If Alternator 2 fails, the system is wired for Alternator 1 to run everything while still charging Battery 1 and 2.  No big deal.

In my experience, turning off Battery 1 to conserve battery power is just a simpler solution when shedding load in the event of a Cirrus Alternator Failure.

Flying the Piper Malibu

ByHank Gibson November 21, 2014

Looking for an airplane with more seats, more useful load, and good speed?  Look no further than the PA-46-310P Piper Malibu.  It feels like a corporate airplane, but this turbo charged piston single is good owner/pilot airplane for taking the family on vacation or using on business trips.

The original Piper Malibu, which was manufactured between 1984-1988, is a great next step airplane for Cirrus owners, Saratoga or Lance owners, and Mooney owners looking to move up to a pressurized, 6 seat piston.  The pressurization has got to be one of the best parts of the Piper Malibu.  The ability to climb up to the low flight levels (the service ceiling is FL250, but the airplane performs great between 16,000 and FL190) to catch better winds and get a better true airspeed (the airplane gains about 2.5 KTAS for every thousand feet) without having to wear oxygen makes the ride much more enjoyable.

Equipped with six seats and a 4,100 pound gross weight, the Piper Malibu allows for a lot more carrying ability than a Cirrus or even a Saratoga.  Now, like most piston airplanes, you can’t take 6 average adults, bags, and full fuel, but here’s the great part:  the Continental TSIO 320 only burns 16.5 GPH in cruise at 75% power.  The plane will still fly 200 KTAS at 16.5 GPH.  With 120 gallon capacity, even taking half tanks still allows for a 2.5 hour range with an hour reserve.  At 200 KTAS, that’s 450 miles.  And, you gain an extra 360 pounds useful load at half tanks.  That’s not too shabby.

The Piper Malibu was designed to be comfortable, fast, and be able to carry some baggage.  There are two baggage compartments, one in the nose behind the firewall and one in the rear behind the rear seats.  The nose baggage is wide enough to fit golf clubs in, while the back baggage is large enough to fit rolling suitcases in (the front baggage has no problem with roller bags either).  Lots of weight in bags?  Again, no big deal.  Just plan on taking less fuel and still flying for 2.5 hours.

From a pilot’s standpoint, the Piper Malibu is a pretty straightforward airplane to fly, though it does require some specialty training.  A lot of PA-46s on the market right now have upgraded glass panels and digital engine monitors, making piloting the airplane that much more streamlined.  Most Piper Malibus are equipped with the KFC 150 autopilot.  Some have a yaw damper installed, others don’t.  Some have the vertical speed and altitude capture installed, others don’t.  It just depends on that specific airplane.  They aren’t like a Cirrus where they are all made the same.

Looking to upgrade to something with more seats, a higher service ceiling, but not a significant increase in fuel costs?  Look into the Piper Malibu.  You can get one in good shape from about $300,000.

Aviation News: The Formation of ONE Aviation

ByHank Gibson April 30, 2015May 1, 2015

Earlier this month, Eclipse Aerospace and Kestrel Aircraft merged to form ONE Aviation.  Most pilots are familiar with Eclipse, who makes the Eclipse 550 jet, but not many have heard of Kestrel Aircraft.

Kestrel Aircraft is run by Alan Klapmeier, co-founder of Cirrus Aircraft and brother to Dale Klapmeier, who still runs Cirrus.  Klapmeier joined Kestrel in 2010 and brought innovation to the K350 Turboprop design that Kestrel was developing.  Kestrel has been lacking in investors to further their project, but the merger will help a lot in getting more funding.  Klapmeier assumed the CEO role for ONE Aviation.

The merger will also help bring more innovations to the Eclipse 550.  The original Eclipse Jet was a miserable failure and the company went into bankruptcy in 2009. The Eclipse Jet came back to market in 2013 as the Eclipse 550 with many much needed improvements, including making GPS a standard amenity.

Klapmeier and his genius will lead ONE Aviation in good directions.  The K350 will come to market a lot sooner as more investors will be drawn to the company, while the Eclipse 550 will continue to see new and innovative developments.

Air Traffic Control Privatization

ByHank Gibson January 25, 2016

There was a bill introduced in Congress recently to take control of Air Traffic Control away from the FAA and give it to a private, for profit, corporation.  The initial reaction of pilots is “Ahhh!  User fees!” which we are all adamantly opposed to.  There are a myriad of reasons why this is a bad idea (the “Flying” article makes a comparison to giving NASA to Richard Branson and Jeff Bezos) and we as pilots should be against it.

Read the “Flying” Magazine full article here.