English English English English English English English English English English landing gear landing gear English English undercarriage English English English English retractable main landing gear English English landing gear English English English English Landing gear English Landing gear English English English retractable main landing gear English English English English LANDING GEAR English English landing gear سخت افزار فرود landing gear English English English English English English landing gear English English landing gear landing gear English en.wikipedia.org... undercarriage English English English English http://en.wikipedia.org/wiki/Landing_gear#Direct_steering English English English landing gear English English English English Landing gear English English landing gear English English English English retractable main landing gear