Medical Matters

The aviation industry in recent years has highlighted loss of control in-flight (LOC-I) as the leading cause of general aviation fatal accidents. Many aviation organizations, including government agencies, have devoted considerable time and resources to target this problem and develop effective mitigations to reduce the number of LOC-I accidents. Much of that effort focuses on a pilot losing control, and how to train and equip to prevent it, because its the final event in the accident chain.

The primary cause of a bounced landing is flaring too high above the runway, perhaps with too much speed. In our ideal, perfect landing, the airplane will quit flying just inches above the runway. Instead, a bounce results when the flare occurs a few feet above it, and the airplane has the energy-resulting from excess altitude, excess airspeed or both-to rebound back into the air. In any event, a bounce results when the airplane isnt finished flying.

Years ago, when I first heard the term runaway trim, my initial thought was something along the lines of, How can that happen? All of the trim systems Id seen up to that time had been manual, unassisted crank, lever or thumbwheel affairs, which rely on the pilot grabbing something and moving it to achieve the desired change. I was aware that trim systems could mechanically fail, but generally would stay in a fixed position when they did. I had discussed and trained for abnormal trim conditions, but how could a trim system run away? Then I learned about electric trim, autopilots and runaway trim, and it all became clearer.

I was flying a 2002-model A36 Bonanza (yeah, with me its always a Bonanza) home to Wichita from Thanksgiving in Ohio with my wife and our son aboard. Somewhere over Indiana, the Bonanzas attitude indicator (AI) began to tumble. The failure announced itself slowly, but very soon the instrument was pitching up and down in very distracting oscillations. It then displayed a range of indications-from off-scale nose-up pitch excursions to slightly below 20 degrees nose-down-in a roughly two-second cycle, while indicating bank angles between wings-level and about 10 degrees left.

During descent, pilot noted oil streaking back from top engine cowl louvers, then dropping oil pressure. Pilot conducted precautionary shutdown and feathered propeller. Pilot continued descent and landed at destination without issue. Maintenance removed cowling and found oil appearing to come from the turbocharger (p/n 4066109025) area. Further investigation revealed oil bypassing the seals on the turbo.

I had flown a full day with the new owner of a turbocharged Beech Bonanza, a recently retired airline pilot who also had been a U.S. Air Force tanker pilot. He was IFR proficient from the airline and wanted to focus on visual and hand-flying skills while orienting to his airplanes autopilot and avionics. He did a great job and got markedly more comfortable with the airplane as the day progressed. At the end of the day, I recommended he get more experience with the airplane before going IFR in it. We shook hands and I went to my office to complete my paperwork.

By the time you read this, itll be late September or early October. In some regions of the U.S., that means leaves changing color, frost on the pumpkin and winterizing the house, the vehicles and the airplane. In other regions, like where I am, it means shutting off the air conditioning, opening the windows and putting a final close cut on the yard. Cooler, better flying weather, along with some seasonal challenges, likely will confront us all soon.

I appreciate David Jack Kennys take on the value of keeping up with performance and ground-reference maneuvers after the checkride (Maneuvers, September 2018). Ive found that they definitely help me to build confidence when Ive been out of the left seat for a while, and can quickly restore the feel of the airplane. The same is true when confronting an unfamiliar type or when assessing skills of a new pilot-acquaintance.

If there were some way I could make a series of trips back in time to change things, one of the stops on my itinerary would be to somehow infiltrate the small cadre of early pilots and airplane designers to convince them to use a word other than stall to describe what happens when a wing exceeds its critical angle of attack. The word obviously has numerous other applications, and using it for this purpose has confounded student pilots and television news anchors ever since. That said, Im not sure what should replace it, and remain open to suggestions.

Recent, similar efforts involving the FAA and the GA community are picking up in tempo. Youve already seen some of the institutional changes: relaxed certification standards for installing advisory angle-of-attack indicators and the new rash of all-electronic attitude indicators, among others, which are designed to help minimize the classic loss-of-control inflight accident. These and other outcomes may be producing tangible results, but its too early to be sure. Regardless, by using a data-driven approach and producing specific safety enhancements, these efforts are creating some useful outcomes for GA pilots. The way this came to be is an example of why you never want to see sausage made.