An undercarriage can be a wheel.Logical formLearned from2 sentences. An undercarriage may be mounted on legs.Logical formLearned from2 sentences. Gears may pertain-to a conventional undercarriage.Logical formLearned from2 sentences. Gears of a conventional undercarriage may retract aft.Logical formLearned from2 sentences. (Undercarriage legs) may retract into (engine nacelles).Logical formLearned from2 sentences. An undercarriage can be of track.Logical formLearned from2 sentences. An undercarriage can be tracked.Logical formLearned from2 sentences. An undercarriage may have an axle.Logical formLearned from2 sentences. A (cantilever monoplane) can be with an undercarriage.Logical formLearned from2 sentences. An undercarriage may be used.Logical formLearned from2 sentences. (Undercarriage legs) can be retractable.Logical formLearned from2 sentences. A landplane can be with an undercarriage.Logical formLearned from2 sentences. An undercarriage may be jettisoned.Logical formLearned from2 sentences. An (undercarriage leg) may be introduced.Logical formLearned from2 sentences. Changes can be in a shape of an (undercarriage bay).Logical formLearned from2 sentences.