See if you agree with my conclusion…
We used to call them homebuilts, which a big majority have always been, and that activity is one of the few areas in private aviation that is still growing. The goal has always been to encourage pilots to build their own airplane for the purpose of self-education and recreation. Regulations are kept to a minimum to keep costs down and in return the builder is supposed to do over 50-percent of the work on the airplane. The activity is right there with apple pie and motherhood but that doesn’t keep naysayers from having their “aha” moments.
From time to time those “aha” folks will come up with the startling (to them) discovery that the safety record in what the NTSB now calls E-AB (experimental – amateur built) aircraft is not as good as it is in store-bought certified airplanes. Depending on whether fleet size or flight hours is used as a measure, the E-AB fatal accident rate has been shown to be from two to seven times higher than for certified airplanes.
A look at the accident history of these airplanes can put this into context. In a 2012 study the NTSB compared E-AB airplanes with certified airplanes used for the same purpose. In both groups that basically meant piston singles though they did also include gyrocopters which would be almost exclusively E-AB.
The NTSB found 131,700 certified piston singles and 21,300 E-AB airplanes that fit. (I have seen E-AB fleet estimates as high as 33,000.) For some reason the ratio of accidents to airplanes is often used when talking about E-AB airplanes where the number is usually in relation to 100,000 flight hours for certified airplanes.
In raw numbers, there were 70 E-AB fatal accidents in 2009 and 31 in 2013. That covers the highs and lows and in perusing the 2015 and 2016 preliminary accident reports I counted 52 for 2015 and 43 for 2016. The big difference between the high and low annual numbers is something that has never happened in similar certified airplanes, where the rate stays pretty steady.
Those are significant numbers when compared to an estimated fleet of from 21,300 to 33,000 airplanes. If you split the difference on fleet size and annual accidents, that would be one fatal accident for about every 600 E-AB airplanes. Using numbers I found in various reports I found that number to be about one fatal for every 1,000 certified singles. In its 2012 report the NTSB found a greater disparity than that.
As an aside, last year there was one fatal accident for every 8,136 registered motor vehicles in the U. S. There is no comparable number for U.S. airline flying because in almost all recent years there have been no fatal accidents.
It is assumed that certified airplanes fly more hours each than E-AB airplanes so the fatal accident rate per 100,000 hours would show a greater difference. Anything based on flying hours is suspect because nobody really knows how many hours are flown and the FAA has resisted calls to get an accurate count by simply requiring a post card after each annual inspection that shows how many hours the aircraft flew that year.
The higher incidence of accidents in E-AB aircraft is just as logical as the fact that the fatal accident rate in private (general) aviation is almost infinitely higher than it is in airline flying. When more freedom is granted by reducing regulations and eliminating stifling procedures then the risk goes up. In airline flying, risk is managed by making all pilots and carriers toe the line on procedures and regulations where in private and especially E-AB flying, risk management is left solely to the pilot. For E-AB that freedom extends to the building and testing of the airplane though the FAA does have requirements for the flight testing of newly-built E-AB airplanes.
E-AB activity is also well-supported by the EAA. The association offers excellent information and guidelines for builders, from construction through the required 25-hour (40 if an uncertified engine is used) test flight period, and individual EAA members and local chapters also offer support and encouragement to builders and pilots as they build and enjoy their airplanes. If you want to get a feel for this, look at the website for Chapter 1600 in Delaware, Ohio.
One of the first friends I lost in an airplane accident was flying an airplane he had built himself, from plans. It was small, a single-seater, and the only time I saw it was after the accident. There was not much left and what was there looked pretty flimsy to me.
The accident happened in the traffic pattern and it was likely a low-speed loss of control and spin-in. According to an NTSB study, loss of control is a factor in 43.9-percent of E-AB accidents v. 29.7-percent for certified airplanes.
That difference there is not as much as I expected it to be. The low speed handling and stall characteristics of a Cessna 172, for example, are carefully addressed in the certification requirements where in an E-AB those characteristic are left pretty much to the designer and builder. Maybe this tells us is that even without regulation, fairly careful attention is paid to low speed handling qualities in E-AB airplanes.
Flying qualities likely have a lot to do with the fact that a disproportionate number of E-AB accidents happen in the first hours the airplane is flown after it is completed, or in the first hours flown by a subsequent buyer. A pilot moving among certified airplanes won’t find many differences in basic handling qualities where there is likely a much wider variation among E-AB airplanes.
I don’t have a lot of hours in E-AB airplanes but I have flown a number of different ones and have seen a wide variation in flying qualities, from terrible to excellent.
I’ll tell you about the excellent ones first.
When I flew the Swearingen SX-300 my first thought when I looked at the diminutive wing from the cockpit was about Ed Swearingen. I first met Ed when we were in our 20s. I was in the Army at the time and an L-23 (Twin Bonanza) showed up that had been heavily streamlined (probably with body putty) to get some extra speed.
Ed had something to do with that and with a lot of other airplanes as we both made our way in the aviation business. So when I looked out at the tiny wing, I thought it was okay because I trusted Ed. The airplane was delightful to fly though it sure was loud inside.
The Questair Venture was the same deal. I trusted Jim Griswold, who was key in the development of the Piper Malibu and who designed the Venture. When we finished the photo mission in that airplane, a low cloud deck had moved in and I had to fly a low-weather ILS in the airplane on my first flight in it. Jim’s pilot who was with me was not instrument rated. I wondered about the legality of that but decided it was one of those “don’t ask, don’t tell” situations. It was nice to fly on instruments.
I flew the Glasair, too, and found the handling qualities there to be good.
Those airplanes are small with big engines. There are no secrets in airplanes and you could look at any of them and tell that they would glide like a brick. I tried power off approaches and landings in the SX-300 and the Glasair and they reminded me a little of a helicopter autorotation. You had to arrive at the flare point with enough energy and there, in an instant, you had to make the peanut butter and jelly come out even.
That’s what E-AB is all about. If you want a little airplane with a big engine you can have (build) it and the stalling speed can be higher than the 61 knot limit for certified airplanes. That there will be more risk in case of an engine failure is obvious.
In the case of the E-AB airplane with the worst handling qualities, the Prescott Pusher, the problems there were pretty obvious too. It was a chunky, short-coupled airplane with a t-tail, a long wheelbase and a 180 horsepower engine. That suggested a sluggish takeoff with a lot of pull required to rotate and then an immediate reduction in back pressure. That’s a recipe for a pilot-induced pitch oscillation, which I had seen before but never that bad. It was twitchy as all get-out in pitch.
I offer those examples just to illustrate the potential for a wide variety of handling qualities when airplanes are designed outside the certification rules.
Pilots who have accidents in E-AB airplanes tend to have more flying experience than those wrecking certified airplanes. They are also older. There is not enough difference, though, to set the two groups of pilots apart.
Powerplant failures lead to almost twice as many accidents in E-AB airplanes and these also often come on early flights after build or purchase. Because power failures are often followed by a low-speed loss of control, these two accident causes do go together. I think the fact that less than half the E-AB powerplant failure accidents occur in airplanes that use a certified engine helps explain the number of power failures.
A frequent cause of power failures, especially early in the life of an E-AB airplane, is the lack of a proper amount of fuel and air being fed to the engine. This is a design matter, well covered by the regulations for a certified airplane, but if not properly addressed in the design and build of an E-AB airplane it can lead to an early power failure. The NTSB did note that the number of E-AB engine failure accidents could be substantially reduced by requiring that the builder document a functional test of the fuel system. This is actually in the EAA-recommended procedures before a first flight.
There are less weather-related accidents in E-AB airplanes than certified airplanes even though a lot of them are well-suited for cross country flying, where weather accidents usually occur. Properly equipped, they can be flown IFR, too, and just now, at 9:25 a.m. I counted five E-AB airplanes in the IFR system.
I attended my first Experimental Aircraft Association fly-in before the event moved from Rockford, Illinois, to Oshkosh. I didn’t know a lot about the homebuilder activity at the time and, as I walked the grounds and looked at the airplanes, my main thought was that a lot of them did indeed look like they had been built in a basement. They were, however, the pride and joy of the individuals that built them.
At the time, most of us thought of homebuilts as Pober Pixies and Breezy Pushers, both simple airplanes that were of greatest value to those who just wanted to get into the air, literally in the case of the Breezy which you fly on, not in. I did it once, it was a hoot, and I never went back for more.
How things do change. As time ran more build-kits were developed and fewer airplanes were built from plans, though that activity still goes on.
Van’s Aircraft currently shows eight different models of the popular RV series in both two- and four-place versions. When I had my airplane based at Hagerstown, Maryland, I had hangar neighbors who had built and were flying RVs. The workmanship in the airplanes was beautiful, better than any factory-built metal airplane, and the owners used the airplanes just like you would use a Piper, Cessna or Cirrus. The airplanes are fast, efficient and comfortable.
Where a lot of people equate amateur-built with inexpensive, that isn’t necessarily so. An example is the Lancair Evolution, a four-place pressurized airplane powered by your choice of three different P&W PT6A turboprop engines. It is an airplane you would use like your King Air except if you wanted to see how the King Air was doing you would need a rear view mirror in your Evolution.
You would also need at least half a King Air checkbook. Used Evolutions run well north of a million bucks and I doubt if you could build a new one for less than a million and a half.
The Evolution was developed by Lancair and the kits are sold by The Evolution Aircraft Company which also operates an extensive program to help buyers complete their airplanes in a manner that satisfies the FAA requirement for builder participation. It is definitely not a garage or basement project and professional help is a necessity.
The company is careful to make sure the airplane is built in compliance with those FAA E-AB rules and indeed builder attendance is required for a good deal of time during the process though what the builder does is steered away from the critical stuff.
I was interested in a comment on the Evolution website about approved ice protection equipment. The point was made that there is no type certificate for the airplane so no required supplemental type certificate can be obtained for icing flight approval. The equipment is available, it can be installed, and it will offer the same protection as it would if approved so I suppose that is just a bit of trivia.
There are likely ways for a person to have one of the many kit-built airplanes built by someone else and flown through a loophole in the regulations. There are also kits that look almost like completed airplanes when they reach the builder.
It is also perfectly legal to sell a completed E-AB airplane and there are a lot of them for sale in and on Trade-A-Plane. It is interesting to me that the NTSB found that new owners have many of the same problems that were experienced on early flights by the builders themselves so if you purchase a used one, approach it like it just hatched.
It is difficult to get an idea about the safety record of different E-AB airplanes because the FAA registration rules allow the pilot to register the airplane under whatever name he wishes. Most builders use their own name with a reference to the type, like John Smith RV, but nothing specific is required.
Just looking at the list of accidents, no conclusion can be drawn other than that the pressurized airplanes the Lancair IVP and Propjet and the Evolution might be there more often than things like RVs. This same situation exists in certified airplanes where P210s are wrecked more often (per 100,000 hours) than T210s and Malibu/Mirages more often than Saratogas.
In its study, the NTSB did note that in-flight structural failures don’t often occur in E-AB airplanes.
They do occur, though, and one E-AB accident is worthy of note here.
Steve Wittman was an icon in the homebuilding and air racing business for many years. He built some outstanding racing airplanes and did well flying them in a lot of races. Steve was also one of the founders and a force in the Experimental Aircraft Association. That little airport where pilots gather in great numbers every summer is, in fact, Wittman Regional Airport.
Steve lived in Oshkosh and Ocala, Florida, where it is said the winters are more pleasant. He built a one-of-a-kind airplane to fly between the two places and named it the O & O for Ocala and Oshkosh. It was a two seater, maximum takeoff weight of 1,850 pounds, powered by a Continental O-470 rated at 205 hp. No doubt that it was a good cross-country airplane.
Steve and his wife were lost when flying that airplane from Ocala to Oshkosh in April, 1995. He was 91 at the time.
The NTSB probable case and findings were as follows: Aileron-wing flutter induced by separation at the trailing edge of an unbonded portion of wing fabric at an aileron wing station. The debonding of the wing fabric was a result of improper installation.
The airframe had apparently failed as they cruised along in good weather.
Mistakes have been made when designing, building and maintaining all types of airplanes including all classes of private (general) aviation airplanes, airliners and military airplanes. A lot of those mistakes have led to accidents, as this one did, but that has never stopped aviation from flying on.
I have never owned an experimental airplane nor have I flown them extensively but I feel a bond with the folks who do.
The accident record in private flying when I soloed in 1951 was about like the accident record in E-AB flying today. When I started, we were free spirits, a band of brothers, who loved to fly. It was almost holy and we weren’t looking for anyone to save us. We knew that what we were doing was a lot riskier than knitting and we didn’t care. That is all true of many if not most E-AB pilots today and I think that in both cases the accident record is simply the result of the interface between the romance of flying and the pilots who practice the art.
So if you ask me what is wrong with experimental pilots, I say nothing. Just leave them alone and let them enjoy flying.