General Aviation

Subscribe to General Aviation via RSS

The initial investigation was conducted by local law enforcement in conjunction with the FAA. Now the National Transportation Safety Board will take over.

The NTSB’s job will be to examine the wreckage and attempt to determine if the crash was caused by a defective aircraft part, negligent maintenance, or pilot error. The NTSB concedes, however, that it lacks the manpower, the technical expertise, and the funding to do that job properly on its own. Therefore, as a matter of long-standing policy, it will seek engineering assistance from the companies that manufactured the aircraft components in question. In this case, the NTSB will recruit the help of Cessna Aircraft, which manufactured the aircraft involved in the accident, Cessna N5225J, and Teledyne Continental Motors, which manufactured each of the aircraft’s two 260 horsepower C-310 File Photo by Kensavition.comengines. The NTSB will exclude members of the victims’ families and their technical representatives from the investigation, feeling that they have nothing to offer. (Sad but true.)

Of course, the NTSB’s practice of asking the manufacturers for help – a practice it calls “the party system” — presents a conflict of interest.  After all, the manufacturers themselves might be the ones responsible for the accident. Some say that the NTSB’s party system is akin to asking the suspects for help in solving a crime. Nonetheless, the conflict – discussed further here – is ingrained in all NTSB investigations.

It’s no surprise that most NTSB final reports often favor the manufacturers who have “assisted” the NTSB investigators in their work. But perhaps it doesn’t make any difference because, by federal regulation, the NTSB’s probable cause findings are not binding on anyone. The families are free to conduct their own investigation, and in the event of a lawsuit, the NTSB’s conclusions are given no deference whatever. In fact, in the event of litigation, the NTSB conclusions are not even admissible. Aviation attorneys who conduct their own independent investigations find that the NTSB’s conclusions are wrong about 50% of the time.

In one recent example, a Teledyne Continental engine similar to those installed on N5225J quitContinue Reading Cessna 310 (Tesla) Crash at East Palo Alto: NTSB Probable Cause Investigation

One might think that a twin-engine aircraft is safer than a single-engine aircraft.  After all, if one engine fails, you still have the other to bring you home safely.  That’s the whole point of the second engine, right?

If one of the twin engines fails in cruise flight, maybe that’s true.  But if it quits right after takeoff, the twin can be extremely difficult to handle.  When the aircraft’s landing gear is down, its flaps set, and its airspeed just above the minimum flying speed, the asymetric thrust generated by the operating engine can flip the aircraft onto its back and out of control.  A "Vmc roll", as it is called, isContinue Reading Tesla Cessna 310 Crash at East Palo Alto: The Paradox of the Twin

Cirrus aircraft are now available with "flight into known icing" (FIKI) capability.  That’s a great feature. I’ve written before, however, that Cirrus is asking for trouble with its marketing.  Cirrus sells the feature as one that both enhances safety and increases the aircraft’s utility.  But Cirrus can’t have it both ways.  If a…

Updated February 12:

A Cirrus SR-20 single engine aircraft collided with a Pawnee tow plane that was pulling a glider. The Cirrus reportedly ran into the Pawnee’s tow line. The Pawnee crashed and the pilot was killed.  The occupants of the Cirrus were also killed.  The glider pilot, however, recognized the impending collision, released his aircraft from the tow line, and landed without injury to himself or his two Continue Reading Cirrus – Pawnee Mid-Air Collison Near Boulder, Colorado

The FAA has instituted new rules designed to keep sightseeing helicopters from colliding with airplanes that are transitioning the Hudson River Corridor near the Statue of Liberty.  The San Francisco Daily Journal, California’s largest legal newspaper, published this column on how the new rules came to pass, and why they aren’t enough.

FAA and

The NTSB’s preliminary report on the crash contains little more than what was in the news accounts. The report does, however, offer one bit of new information.  The helicopter impacted on a magnetic heading of 230 degrees.  That heading is not in line with the route from Reno to Susanville.  While that might ultimately prove to be important, little can be made…

Aircraft engine manufacturers recommend that owners overhaul their engines when they accumulate a certain amount of operating time, usually between 1200 and 2400 hours depending on the engine’s make and model. For example, Teledyne Continental Motors suggests that owners overhaul its IO-550 model engine at 2000 hours. Textron LycLycoming Engine - photo by wirelizardoming suggests that owners overhaul its O-235 engine, like the one pictured, at 2400 hours.

Overhauls are expensive.  Some can cost $40,000 or more.  An increasing number of owners opt to run their engines 200, 400 or more hours past the manufacturer’s recommended "time between overhauls," or TBO.  Once past TBO, they may take extra precautions by, for example, regularly sending out engine oil samples for spectrographic analysis, checking the engine’s compression, and looking inside certain parts of the engine with a boroscope to insure that  things look good. They feel the manufacturer’s TBO recommendations are somewhat arbitrary. By running their engines past TBO they are squeezing more life out of them, and that just makes good economic sense.

The FAA does not require private owners to comply with the manufacturer’s stated TBO interval. The manufacturer’s TBO is therefore advisory only.  As long as a properly certified mechanic hasContinue Reading Running Past TBO: Smart Economics or Owner Negligence?

Burdett v. Teledyne Continental Motors involved the forced landing of a Beech Bonanza after the Teledyne Continental IO-550 engine installed in the aircraft came apart in cruise flight. The passenger was severely injured.

The National Transportation Safety Board blamed the engine failure on the mechanic who last worked on the engine, and cleared the engine…

An A-Star AS350B air ambulance helicopter crashed November 14 at Doyle, California, killing the A-Star Helicopter that Crashed Saturdaythree crew members on board.  According to an article in the Reno Gazette Journal, the pilot made a distress call before the crash. That indicates that the pilot was likely experiencing a mechanical emergency. The photographs accompanying the article show that the wreckage was spread over a fairly large area.  That indicates that the pilot lost control of the helicopter well before he was able to attempt an emergency landing.

Under the circumstances, the NTSB will be looking at the helicopter’s Continue Reading Mountain Lifeflight EMS Helicopter Crash at Doyle, California

Zodiac AircraftThis past April, the NTSB called upon the FAA to ground the entire fleet of Zodiac aircraft because their wings tend to fall off in mid-flight.  As it turns out, a defect in the Zodiac’s design induces an aerodynamic phenomenon known as flutter.  Flutter can destroy a wing or other control surface in a matter of seconds. …