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Shock Cooling in a PA46

ByJoe Casey October 25, 2018

We’ve all heard it said…”reduce the throttle by no more than 1-inch every minutes to ensure you don’t shock-cool your engine”. Does this advice apply to a PA46 engine? Can a PA46 engine (Lycoming 540 or Continental 520/550) really be shock-cooled? How should the engine temperature be managed?

Metals expand and contract with temperature, and the various metals in an air-cooled aviation engine expand and contract at a different rates. Shock-cooling supposedly occurs when the engine changes temperature quickly and the different metals in the engine cool (and therefore change shape) at different rates. When the change occurs dramatically supposed scoring, rubbing, and marking of the metal can occur, which can cause catastrophic results.

So, let’s back to the original question…can a PA46 engine suffer shock-cooling and should a pilot operate the engine so as to avoid shock cooling? Simply put, I’ve never seen nor heard of any piston PA46 engine suffer shock-cooling. In 5000+ hours flying the piston PA46 and 16 years of flying/managing/training in the Malibu/Mirage/Matrix, it simply has not happened to me nor anyone I know. Does it mean that it cannot happen or has never happened? No. But, it is certainly not a prolific threat to our fleet.

Should the owner/pilot operate the engine with a cautious eye cast toward the potential of shock cooling? Well, sort of…but, let’s flesh this out. My suggestion is that a pilot should operate the engine with conservatism in movement of temperature, but only because this is a good operating practice with any machine, and any flying machine is (by definition) not “overbuilt”. And, there are many ways to change the temperature of the engine…not just by reducing power. Here’s a partial list of ways to cool your PA46 engine:

• Reduce power: Obvious…yes. When the engine produces less power, less heat is generated. Reducing power in a piston engine will almost always result in less temperature.
• Lower the nose: By descending (and leaving power in a cruise setting) the airspeed will increase and cool the engine.
• Enrichen the mixture: Fuel has a cooling effect on the engine, so the richer the mixture the cooler the engine.
• Lower the landing gear: Yes…you read that right…engine cooling will occur when you lower the landing gear because more air will flow over the cylinders. Notice the landing gear doors on the PA46 have air louvers. Air flows into the engine nacelle on the front, passes down through the cylinders (along with the oil cooler, intercoolers, and other components) and then out the louvers of the closed gear doors. When the landing gear is lowered the “back door is opened” and a LOT more airflows over the cylinders.

My suggestion is that a pilot only perform ONE of these actions at a time when beginning a descent. This suggestion was presented to me by Chad Menne (Owner, Malibu Aerospace) some time ago and I’ve operated engines this way ever since. If you are at a higher altitude and simultaneously reduced the power, lowered the landing gear, started a big descent, and enrichened the mixture in one flail swoop, I think there’s a chance that your engine would suffer some negative effects that could be called “shock cooling”. So, when you do start a descent, pick one “cooling action” to accomplish at a time. I’m sure you’ll not hurt your engine.

Simply put, shock cooling is not a huge factor in the PA46 community, and a PA46 pilot does not need to be overly cautious. The “one inch per minute” rule may apply in some other airframes, but in the PA46 world it is not applicable.

Joe Casey’s aviation story began in 1990 with his first flight near Nacogdoches, TX in a Cessna 172. From lift-off, Joe knew he would have a lifetime passion flying just about anything that will leave the ground…He was completely hooked.

Along with being an FAA Designated Pilot Examiner (DPE), Joe is an ATP/CFI-AHMG and Commercial Rotorcraft/Glider Pilot in the civilian world and also a UH-60/AH-64 Pilot-in-Command/Instructor/Examiner Pilot in the US Army Reserves.  His passion for the last 19 years, however, has been the PA-46 Malibu/Mirage/Matrix/Jetprop/Meridian. Has has amassed over 6,500 hours in various PA-46 airframes and believe it to be one of the finest flying machines available for the serious cross-country pilot with an eye for efficiency.

Now, Joe has flown more than 12,200 hours in just about every imaginable environment. Whether providing initial/recurrent training in the PA-46’s, TBM’s, instructing in NVG’s in a UH-60 Blackhawk, flying the King Air series of airplanes, giving tailwheel endorsements, or taking kids flying for the first time, he simply loves flying machines and the people who fly them.

Beechcraft Bonanza Ownership

ByHank Gibson May 7, 2014July 14, 2026

If you walk up to any Beechcraft Bonanza sitting on the ramp at an airport and ask the owner, “How do you like your Bonanza?” be prepared to stand there and listen for 15-20 minutes while he brags about his airplane.

The thing about Beechcraft Bonanza owners is that they are almost a part of a cult. They will tell you up and down why the Bonanza is the best airplane out there. They’ll tell you why all the others don’t even come close. They’ll tell you about the payload, the six seats, the variety of configurations you can select from, the ability to land pretty much anywhere. By the time you walk away, you will probably be convinced to buy one yourself.

Bonanza’s are great airplanes. For those of you new to the single engine piston market, a good comparison for a Beechcraft Bonanza would be a Suburban. Not the flashiest ride out there, but extremely capable, comfortable, and family conscious. If you’re hauling a load, you’ll take a Bonanza over a Cirrus or Mooney any day. Have six people? No problem!

One of the best things about a Beechcraft Bonanza is the variety of designs. Four seats, six seats, long range tanks, tip tanks, turbo charged, normally aspirated, steam gauge, G1000, Aspen or G500 retrofitted, dual yoke, single yoke, leather, cloth, and a variety of different colors out there on the market make finding a Bonanza that fits your need pretty easy.

When it comes to picking out an airplane, the first question is always the mission. If you’re thinking about a Beechcraft Bonanza, you’ve already determined you need something with a good useful load. Do you need four seats or six? Depends on how often you’ll be carrying someone or how new of an airplane you want. Older Bonanzas have four seats, but a lot have had significant updating. Newer A36 and B36 Bonanzas have six seats, but are going to cost you more.

Do you need a turbo charged Bonanza? If you’re in a high elevation area or expect to visit the mountains a lot, then absolutely. If you want a better cruise speed and don’t mind a little less useful load, then go for it. If you’re more concerned about being able to load it up and you aren’t going to cross the Rockies often, then normally aspirated is what you want. You’re probably looking at about 160-170 KTAS with the normally aspirated whereas you get between 180-190 KTAS at altitude with the turbo.

Do you need tip tanks? Tip tanks have two advantages. One is the most obvious: you get to carry more fuel, therefore you get to go farther without having to stop (or when you stop for the bathroom, you don’t have to fill up with gas). The other advantage is you get a bump up in useful load. I talked to a Beechcraft Bonanza owner a few weeks ago who had tip tanks on his. He told me max gross on his Bonanza was 3,800 pounds and was eligible for an upgrade of up to 4,000 pounds and all it took was paper work for the STC. That’s quite a bit of load!

Are Bonanzas hard to fly? When moving up from a typical 172 or Cherokee that most people learn to fly in, it does take some adjustment. But, with good Bonanza training from a qualified Bonanza training instructor, then the transition is no problem. There are tons of resources out there to aid all future and present Bonanza owners in their foray into the Bonanza nation. With the American Bonanza Society and Bonanza Pilot Training, there is no lack of training, thoughts and opinions.

In need of an airplane that can pretty much do whatever you need? Then a Bonanza may be right for you.

Spring Cirrus Austin, TX Get Together (CATGT)

ByHank Gibson April 5, 2017April 13, 2017

The South Central Cirrus Owner’s and Pilot’s Association (COPA) Region is hosting it’s second Fly In dinner at the Austin Executive Airport (KEDC) on Friday, October 8th, dubbed the Spring Cirrus Austin, TX Get Together.  The event is from 5:30-9pm.

Like the first CATGT in October, there will be dinner ($25 per person), drinks, and several presentations.  Jack Long and Josh Marvil will speak about their trip around the world in a PC-12.  Ed McCombs and Eric Opiela will give a safety presentation about automation and task saturation.

Plus, best of all, Cirrus is bringing a real live flying SF50 Vision Jet, plus a brand new SR22 G6 with the Garmin Perspective NXi panel.

Fly in or drive to EDC.  The dinner will be in the Henrickson Jet Center’s main hangar.  You will need to RSVP so event organizers can get a proper head count.  The link to RSVP is here.

Register for the CATGT before the slots are all filled up!

Drones: A Brief History

ByAndrew Robinson April 18, 2016April 22, 2016

Drones; these technological wonders have, seemingly, come out of nowhere over the course of a few years. Although they bring with them the promise of convenience and fun, they have also brought problems and uncertainty for the government, general public, and, specifically, the aviation community. But, where did drones come from and are they really something to be worried about? Let’s take a look at Unmanned Aerial Systems (UAS) and hopefully put to bed some of the concerns which seem to be following them around.

It shouldn’t come as a surprise to anyone when I say that drones have recently become overwhelmingly popular. The military, businesses, and hobbyists are increasingly utilizing them for all kinds of purposes, which range from enemy surveillance to package delivery. Drone pilots are in high demand and several aviation universities are even offering majors designed to produce graduates which specialize in UAVs (Unmanned Aerial Vehicles).

Drones are relatively new to the landscape of unmanned flying machines. Although model airplanes have been popular since the dawn of aviation, the first “drones” didn’t start becoming commercially available until a few years ago. As electronic technology advanced, so did model aviation. Models became more and more sophisticated and could be flown remotely as long as they remained within sight of the person flying it.

It wasn’t until about 3 or 4 years ago that the technology became available to develop drones. This is due to the need for very small and light electric motors, batteries, and stabilization systems. Once these started to become popular, it didn’t take long for drones to become bigger, cheaper, and completely automated.

It is important to note that there is a difference between drones and conventional model airplanes and helicopters. Drones are defined most simply as an unmanned vehicle which can be operated without user input from the ground. Conventional model aircraft can take all shapes and sizes, but must be operated within line of sight from the operator; as they have no ability to fly, takeoff, land, or navigate without input via a radio transmitter. So, if you happen to see a model aircraft flying, don’t assume automatically that it is a drone. Most of the time, model airplanes, helicopters and even drones are being flown safely and legally.

Generally, a drone is designed with several arms which come off of a central body. Each of the “arms” typically has a motor with a rotor mounted on it to provide lift while the main body is home to the radio equipment, landing skids and camera gear. If you see a model flying that looks like a conventional airplane or helicopter, odds are it isn’t a drone. Most likely it is being flown recreationally by someone nearby.

Historically, model airplanes and helicopters have been difficult to learn to fly. Before the times of pre-built foam airplanes and ready to fly drones, a modeler had to build their flying machine and find someone to teach them how to fly it. (Otherwise, they would likely only get one short flight). New modelers would be directed toward the local model flying club and would get plugged in with a group of established fliers who could outline the rules for model aircraft as well as get them up in the air safely.

However, because most everything is purchased online in today’s market, drones are bought and flown by enthusiasts who have not been taught the rules, safety protocols, and procedures necessary to safely operate their new kits. In addition, the drones incredible stability and ability to be flown without any skill means that anyone with great enough funds and an equally great lack of common sense can buy a model and program it to fly over any location they choose. Unfortunately, sometimes that includes places which cause problems.

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.

Avidyne IFD 440 Receives Certification

ByHank Gibson July 1, 2015

Avidyne’s plug and play replacement for the Garmin 430, the Avidyne IFD 440, finally received certification from the FAA last week.  The touch screen GPS unit is being marketed as a simple swap out for the Garmin 430.  This release follows up Avidyne’s release last year of the IFD 540, also a plug and play replacement, but for the Garmin 530.

The features and touch screen of the GPS units sound quite nifty, but it will be hard for Avidyne to compete with the GTN 750 and 650 from Garmin.  The unit prices for the IFD 540 and 440 will be less (and installation is simpler), but we will see how the company does.

The STC allows for installation in 1,000 makes and models of aircraft, according to the company, so there are a lot of possibilities for installs.

In conjunction, Avidyne also released a new version of it’s software for both GPS units.  According to Avidyne, this will unlock multiple features that enhances the capabilities of both units.

To read more on the IFD 440 and it’s bigger brother, the IFD 540, check out Avidyne’s website.