AIRCRAFT LANDING GEAR TAIL WHEEL UNLOCKING SYSTEM Russian patent published in 2025 - IPC B64D45/06 B64C25/04 

FIELD: aviation.

SUBSTANCE: invention relates to aircraft engineering, particularly, to aircraft landing gear. Aircraft undercarriage tail wheel unlocking system consists of translational electric mechanism pivoted to fuselage frame attachment bracket, mechanism to unlock rotary and static parts of shock-absorber strut. At that, translational electric mechanism comprises tip; unlocking mechanism consists of the attachment bracket to the shock-absorber strut static part, upper and lower steady rests connected to each other by spacer bushings, cylinder performing translational movement on steady rests rollers, rod assembly located inside the cylinder and consisting of a rod and two slides separated by a compression spring, retainer, which locks landing gear tail leg, tip extending from cylinder upper part, manual unlocking lever and reed relays. Static part of shock-absorber strut is fixed on aircraft fuselage frame by means of shock-absorber strut bracket and is connected with unlocking mechanism by means of attachment bracket. At that, in lower region of static part of shock-absorber strut there is a hole for retainer. Rotary part of shock-absorber strut is connected with static one and has bushing of rotary part for installation in hole of retainer bushing. Reed sensors are made in the form of an upper reed relay and a lower reed relay. Sensors are mounted on a bracket mounted on the lower steady rest, and the control element of the sensor is mounted on the cylinder using the bracket. Wherein retainer arranged at unlocking mechanism cylinder bottom is connected to said cylinder. Wherein the translational electric mechanism is connected to the tip of the unlocking mechanism using a tip, a rocker mounted on its own bracket, and a rod.

EFFECT: possibility to unlock and lock tail wheel both in normal mode (without jamming of retainer) and in situation when retainer is jammed.

1 cl, 6 dwg