N124BKBeech F90 · 1979

On September 28, 2010, about 1940 mountain daylight time, the ventral tail strakes of a Beechcraft F90 King Air, N124BK, contacted the runway during a go-around from the landing roll at Idaho Falls Regional Airport, Idaho Falls, Idaho. The commercial pilot, who was the sole occupant of the airplane, was not injured, but the airplane, which is owned and operated by MTB Investments LLC, sustained minor damage. The 14 Code of Federal Regulations Part 91 personal flight, which departed West Yellowstone Airport, Yellowstone, Montana, about 25 minutes prior to the incident, was being operated in visual meteorological conditions. No flight plan had been filed.

According to the pilot, during his straight-in approach to a planned full-stop landing, he lowered the gear, and subsequently all three green "gear-down" indicator lights illuminated and the red "gear unsafe" light terminated its illumination. He then made a normal touchdown on the main landing gear, but about the time that the nose gear was being lowered, the gear horn sounded, the red "gear unsafe" light illuminated, and the airplane began to settle toward the runway. The pilot therefore immediately initialed a go-around, and as the airplane was lifting off the runway surface, both ventral tail strakes and the ventral/tie down fin contacted the runway surface. After departing the pattern, the pilot performed a manual gear extension, and then flew by the tower to make sure that the landing gear appeared to be in the full down position. After the tower confirmed the position of the gear, the pilot made an uneventful landing. The initial post-incident inspection of the landing gear system revealed that the actuator rod that extends from the left main gear electro-mechanical actuator assembly had fractured.

After being recovered to a hangar, further inspection revealed that the left main gear electro-mechanical actuator assembly had broken loose from both of its airframe mounting brackets, and the right main gear electro-mechanical actuator assembly had broken loose from one of its airframe mounting brackets. It was also determined that the circuit breaker that protects the gear actuator electrical circuit had popped.

According to the Federal Aviation Administration (FAA) Airworthiness Inspector from the Salt Lake City Flight Standards District Office (FSDO) who responded to the incident, after the airplane was recovered, the operator shipped both the left and right electro-mechanical actuator assemblies to Aerospace Turbine Rotables, Inc., for inspection and overhaul. Reportedly, during that process no anomalies were noted that would have contributed to a malfunction of the landing gear system or led to an uncommanded retraction of either main landing gear. The FAA Inspector also stated that upon inspection of the airplane's landing gear system, maintenance personnel did not find any evidence of an anomaly or malfunction that would have contributed to an uncommanded gear retraction.

During a discussion with a representative of Hawker Beechcraft, it was determined that both the popped circuit breaker and the damage and/or fracturing of the brackets that mount the electro-mechanical actuators to the airframe are indicative of a situation where the load that should be carried by the landing gear mechanical over-center down locks has been transferred to the gear actuator assembly.

In conversations with the NTSB Investigator-In-Charge, and with both the FAA Airworthiness Inspector who responded to the incident, and a later discussion with an FAA Operations Inspector from the same FAA FSDO, the pilot was adamant about the landing gear being down, the three green "gear safe" lights being illuminated, and the red "gear unsafe" light terminating its illumination.

At the conclusion of the investigation it could not be determined why the load that should have been carried by the over-center down locks had been transferred to the landing gear actuator assemblies.

On March 20, 2008, about 0100 mountain daylight time, a Beech F90, N124BK, had the nose gear collapse during a landing overrun at Idaho Falls, Idaho. The pilot/owner was operating the airplane under the provisions of 14 Code of Federal Regulations (CFR) Part 91. The certificated private pilot and five passengers were not injured. The airplane sustained substantial damage to the airframe in the nose wheel well. The personal cross-country flight departed Salt Lake City, Utah, with a final destination of Idaho Falls. Visual meteorological conditions prevailed, and an instrument flight rules (IFR) flight plan had been filed.

The pilot stated that he flew IFR from Salt Lake City to Idaho Falls. He cancelled IFR about 25 miles from Idaho Falls, and proceeded under visual conditions. He decided to land on runway 35.

The pilot stated that he was high and fast as he crossed the numbers. At touchdown and reverse thrust, he didn't like what he was experiencing, so he added power to abort the landing. It took the engines 1 to 2 seconds to spool up, and he decided that it would be better to roll off the end of the runway than to attempt a takeoff with so little runway left. He went back into reverse thrust. He did not apply full brakes, as he was concerned that the airplane might flip over. The airplane went off the end of the runway, and slid to a stop in snow and mud. The nose gear collapsed in the process.

The pilot shut the engines down, and verified that his passengers were not injured. They evacuated the airplane, and went to the hangar.

The pilot stated that he had planned for the late hour arrival by resting during the day. He was alert and in good health. The runway was clear and dry, with excellent braking conditions. The airplane had come out of a phase check recently, and there were no squawks; the engines ran great.