Plane & Pilot
Friday, July 1, 2005

Safety In Numbers


The latest NTSB statistics suggest a decrease in general aviation accidents


This past March, the National Transportation Safety Board (NTSB) released preliminary accident statistics for 2004. The numbers show a welcome overall safety trend for general aviation (GA), with total accidents going down from 1,741 in 2003 to 1,614 in 2004. The accident rate decreased from 6.77 per 100,000 flight hours in 2003 to 6.22 in 2004. That’s a drop of more than 8%. Even better was the change in the number of fatal accidents, going from 352 in 2003 to 312 in 2004. The fatal accident rate in 2003 was 1.37 per 100,000 flight hours, and the 2004 rate was 1.20, which is a decrease of just over 12%. In 2004, 556 people were killed in GA accidents, compared with 623 in 2003.

If there’s a wild card in the accident rates, it’s in the number of flight hours upon which the calculations are based. Flight hours for GA are estimated by the FAA. The FAA’s estimate for 2003 was 25,705,000. For 2004, the estimate was 25,900,000 flight hours. Some pilots who observed that traffic at their home airports was lighter in 2004 than in the past might wonder how the FAA came up with an estimate of increased general aviation flight hours. One possible explanation is because of the increased business aircraft activity, which would have a positive effect on the accident rates, since flight crews of upscale business aircraft generally engage in recurrent training, hold advanced certificates and ratings, and may even be full-time professionals.

So as a category, GA has made good progress in the area of safety according to the statistics. But there’s still more work to be done. Here are two examples of accidents from 2004, which might have been avoided through better preflight planning and in-air decision making as well as a better understanding of aircraft limitations.

Cessna 182G
On January 1, 2004, about 7 p.m., a Cessna 182G crashed in snow-covered terrain about 21 miles southwest of Glasgow, Mont. The airplane was owned by the pilot and was being operated as a VFR cross-country personal flight under Part 91. The private pilot and three passengers were fatally injured. Dark night conditions prevailed. The flight originated at Mobridge, S.D. The pilot’s flight-planned destination was Cut Bank, Mont. The aircraft departed Mobridge approximately three hours prior to the accident. At 6:23, the pilot contacted the FAA’s Automated Flight Service Station at Cedar City, Utah, and requested an in-flight “weather update from Glasgow to Cut Bank.” The specialist reported, in part, that low ceilings and visibilities were forecast for Cut Bank and that VFR flights were not recommended along the intended route of flight due to an AIRMET for IFR conditions, icing conditions and areas of mountain obscuration. After receiving the forecast weather for the route as well as current weather observations for north central Montana, the pilot reported that he was diverting to Havre, Mont. At that time, the most current observation for Havre reported broken clouds at 5,500 feet and a visibility of 8 sm.

After midnight, the FAA issued an alert notice for the aircraft after it failed to arrive at the pilot’s flight-planned destination. A search for the missing aircraft was initiated. On the afternoon of January 4, 2004, the aircraft wreckage was located approximately 21 miles southwest of Glasgow, southeast of the intended alternate. Bad weather, including blowing snow and below-zero temperatures, prevented investigators from reaching the site until January 7.

The pilot held a private-pilot certificate with an airplane single-engine land rating. The pilot didn’t hold an instrument rating. The pilot’s third-class medical certificate contained a limitation requiring the pilot to wear corrective lenses. On his medical application, the pilot reported that he had accumulated approximately 175 total flight hours, including approximately three hours in the six months preceding the application date. At 7:16, the hourly report for Havre was wind from 030 degrees at nine knots; visibility, 3 sm with light snow; sky conditions and clouds, 1,100 feet overcast; temperature, minus-13 degrees C; dew point, minus-16 degrees C; altimeter, 29.69.

The 6:56 hourly observation at Cut Bank was wind from 350 degrees at 13 knots; visibility, 3⁄4 mile in light snow and mist; vertical visibility at 600 feet; temperature, minus-16 degrees C; dew point, minus-17 degrees C.





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