JACKSON, WY, USA
N538AJ
PRICE BERKUT
As the pilot approached his destination, the landing gear 'transition' light illuminated indicating operation of the hydraulic pump, although the landing gear was still retracted. When the pilot lowered the landing gear, they failed to extend. He then manually lowered the gear, but was unable to obtain green 'down and locked' indicator lights for the main gear. During the landing, the main gear collapsed, and the aircraft impacted several runway lights. Postcrash examination revealed that the electrically driven hydraulic pump had burned out. Additionally, the over-center downlock springs, which were to assist in manually locking the gear into a down-and-locked condition during manual extension, had never been installed by the builder/previous owner.
On June 18, 1996, approximately 1915 hours mountain daylight time, a homebuilt Price Berkut, N538AJ, registered to and being flown by a private pilot, was substantially damaged when the landing gear collapsed on landing roll on runway 18 at the Jackson Hole airport, Jackson, Wyoming. The pilot was uninjured. No flight plan was in effect and visual meteorological conditions existed at the time. The flight, which was personal, was to have been operated under 14CFR91, and originated from Sioux City, Iowa, approximately 1500. The pilot reported that approaching the Jackson Hole airport while in turbulence the landing gear "transition" light (indicating hydraulic pump operation) illuminated even though the gear was presumed to be retracted. When the pilot attempted to lower the landing gear they remained retracted. He then manually lowered the gear and the nose landing gear green "down and locked" light illuminated but the corresponding main gear lights did not. The pilot attempted side load maneuvers and high "G" pull-ups to attempt to lock the main landing gear without success and the corresponding main gear green lights remained out. He then executed an approach and landing during which the main landing gear collapsed on rollout and the aircraft impacted several runway light during the subsequent ground slide. The pilot reported in a subsequent telephone conversation that the electrically driven hydraulic motor which operates the landing gear had burned out. Additionally, he reported that the over-center downlock springs which insure the main landing achieving a down-and-locked condition when the hydraulic system has failed, were not installed in the aircraft by the owner/builder from whom he purchased the aircraft. The pilot submitted only pages 1 through 4 of the NTSB Form 6120.1/2 and did not include a narrative history of flight.
failure of the electrically driven hydraulic pump; and the absence of the main landing gear over-center downlock springs, which were not installed by the previous owner/builder.
Source: NTSB Aviation Accident Database
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