Abstract: A fail safe retractable landing gear unit for model aircraft utilizing a fluid pressure powered piston type activator to retract and hold the landing gear retracted with sustained pressure. Upon release or loss of pressure a return spring acting on the piston automatically extends the landing gear. The hinged retracting mechanism and the activator are mounted rigidly in a unitary bracket, which holds the activator in sealed condition and precise alignment, the mechanism having positive locking in the retracted and extended positions to minimize landing gear loads on the mechanism and activator. Only a single pressure connection is required to each unit in a multiple unit landing gear installation.