N349TAConstrucciones Aeronauticas Sa C-212-CC · 1986

On September 18, 2009, at 1412 Alaska daylight time, a Construcciones Aeronauticas SA (CASA) C-212-CC, N349TA, sustained substantial damage after veering off runway 05 during landing at Savoonga Airport (SVA), Savoonga, Alaska. Bering Air Inc., operated the airplane under the provisions of Title 14 Code of Federal Regulations (CFR) Part 135, as a cargo flight. The certificated airline transport pilot captain, and certificated commercial pilot first officer were not injured. Visual meteorological conditions prevailed, and a Defense Visual Flight Rules (DVFR) flight plan was in effect. The flight departed Nome Airport (OME), Nome, Alaska, at 1312.

During a telephone interview with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC), the captain reported that he was the flying pilot on the accident leg, and that prior to departure they had checked the weather, and obtained the pertinent Notice to Airman (NOTAMs) for the destination airport. The captain reported that one of the NOTAMs identified a partial runway closure with construction crews in the vicinity. The flight took about an hour, with no problems encountered; they noted gusty wind conditions, light rain, and an overcast cloud condition. Twenty miles from the destination airport, the flight crew notified the construction crew of their intent to land. On approach, they overflew the runway at 500 feet to verify the NOTAM, and noted a graded and rough runway. The captain indicated that they flew a teardrop approach and noted that the winds were from the north. He stated that he had to "crab" the airplane into the wind while on final, and said that while on the landing roll, he tried to maintain aircraft control with forward pressure on the nose and applying differential power while the first officer turned the ailerons into the wind. The airplane was difficult to control, and it began to veer to the right side of the runway. The airplane continued to the right, exited the runway surface, and came to rest in a ditch adjacent to the landing runway.

In the captain's written statement, he reported that the airplane was stabilized on a 3-mile final with 100 percent flaps, at an approach speed of 100 knots prior to touchdown. He calculated the crosswind component to be 16 knots gusting to 23 knots with the wind from the left. In the section titled: “Recommendation (How could this accident/incident been prevented?)” of NTSB form 6120.1, the captain recommended a lower crosswind limit for narrow runways, specifically that with runways less than 100 feet in width, the crosswind should be limited to 75 percent maximum demonstrated crosswind component.

A Federal Aviation Administration (FAA) inspector responded to the site and reported that the right main landing gear tire was depleted of air; it was a serviceable tire, but near its wear limit. The inspector stated that the right wing sustained structural damage, and that there were no mechanical anomalies noted with the remaining aircraft systems.

Automated Weather Observing System (AWOS) weather recorded from Savoonga at 1456 was, wind from 010 degrees at 26 knots gusting to 34 knots; visibility 5 statute miles, overcast sky conditions at 800 feet; temperature 04 degrees Celsius; dew point 02 degrees Celsius; the altimeter setting was 29.70 inches of Mercury.

The Airport/Facility Directory indicated that the runway at Savoonga is 4,400 feet in length by 100 feet in width. The airport is unattended and the runway conditions are not monitored. A visual inspection of the runway is recommended prior to landing. The runway is comprised of gravel, with rocks up to 5 inches on the sides of the landing surface. Several Notices to Airmen (NOTAMs) were in effect at the time of the accident. One of the NOTAMs reported that the north half of runway 5/23 was closed.

According to the airplane’s Operations Manual, under “Crosswind Speed Limits,” it notes a critical crosswind component has not been determined. However, the maximum crosswind component demonstrated during takeoffs and landings is 20 knots. In addition, a subheading titled “Slippery Runways,” in the Crosswind Landing section of the Operations Manual, recommends, in part, that the operators adjust the crosswind limit, reducing it by 25 to 75 percent, depending on slippery conditions.

In the section of the Operations Manual titled Landings, subheading “Final Approach, Flaps,” it is recommended that flaps be at 15 degrees for a normal approach and landing, and suggests that full flaps not be deployed in strong crosswinds due to controllability in the flare.