The landing-gear of this Boeing 737-500 is of course provided to support its movement on the ground, but also designed for absorbing the shock on landing. In order to reduce drag in flight, the landing gear is retractable. The extension and the retraction is performed hydraulically. The crew has an indication on flight-deck which confirms that the gear is down an locked. In case of a system-malfunction, a mechanical backup-system can unlock the gear. It causes it to fall out (and lock) by gravity force. The nose-gear is steerable for manoeuvring on ground. Hydraulically operated brakes are provided on the main gear wheels, but not on the nose wheels. An anti-skid system provides maximum braking performance on slippery runways. Considerable amounts of heat is generated during braking and absorbed by the brakes.