 SCP-1850 Object Class Safe Special Containment Procedures SCP-1850 is to be kept at an aircraft hangar in Site-6. The temperature within the hangars will be kept above 15°C. A radio beacon has been attached to SCP-1850's landing struts. The beacon's battery levels and proper function must be confirmed before SCP-1850 leaves its hangar for any reason. No personnel are to enter SCP-1850's cockpit, or to touch any surface within the cockpit unless SCP-1850 has first been neutralized. Tranquilizers are to be administered by injecting its food with 80mg of disapam, warming the food to 30°C, introducing it to SCP-1850's cockpit, and then waiting until the food has been consumed. An 80mg dose of disapam tranquilizes SCP-1850 for approximately 90 minutes. Tranquilizers are not to be administered more often in once every 10 days. Once every 3 days, SCP-1850 is to be fed 65kg of mice, rats, rabbits, chickens, and pigeons, pre-killed and warmed to 30°C, 3g of veterinary-grade chondroitin sulfate, and 15g of veterinary-grade glucosamine sulfate are to be included in SCP-1850's food during each feeding. Foundation veterinarians have recommended that, for the sake of its physical health, SCP-1850s be allowed to leave its hangar once every 5 days to engage in tethered flight. The tether is to be made of reinforced steel cable, and is not to exceed 150m in length, see Document 1850-NL4 for tethered specifications. The tether is to be attached before SCP-1850 leave its hangar. During its flight, SCP-1850 is to be accompanied by 2 Foundation light aircraft. Tethered flight sessions are not to exceed 40 minutes in duration. SCP-1850's fuselage and external components are to be hand-watched after each flight session. Description SCP-1850 is an anonymous organism in the exact shape of a full-size 1917 soft-width triplane aircraft. It is composed entirely of living tissue. DNA analysis of samples indicate that it is avian and male, and of an unknown species of the genus decipiter. Tethered's epidermal tissue covers the fuselage, and the airplane infrastructure, struts, etc. is made of reinforced bone. However, there did not appear to be any other particular correspondence between aircraft structure and avian anatomy. See Document 1850-Y23 for detailed analysis of SCP-1850's eternal anatomy. Notably, the cockpit functions as a mouth equivalent. Whenever an object with a mask greater than approximately 8 kg, and an overall temperature greater than approximately 30 °C, touches any surface within the cockpit, the pilot's seat and safety harness animate, restrain the object, and tear it into small pieces while secreting a mixture of digestive enzymes and gastric acid. The resulting flurry is absorbed through all surfaces in the cockpit. 24-36 hours after SCP-1850 feeds, its machine gun will activate and fire several rounds of ammunition. This ammunition is formed entirely of guano, moving at approximately 8 meters per second, and as such is not considered a significant hazard to personnel. Although SCP-1850 has not been found to have any identifiable sensory organs, it is nonetheless able to detect and respond to external stimuli, and has demonstrated the ability to recognize faces and voices despite the lack of any identifiable brain analog. It has also demonstrated the ability to aim its machine gun in specific personnel. SCP-1850 is able to move organs which would correspond to mechanical parts, such as rotating its wheels, flexing its ailerons, and spin its propeller, with this last apparently being a sign of pleasure. But it is largely in mobile and docile when on the ground, allowing itself to be touched, probed, and examined as long as nothing is placed within its cockpit. However, it will flinch when tissue samples are taken, tremble during thunderstorms, and bounce up and down when its tether is being attached prior to flight sessions. Subject is able to regenerate tissue removed during sampling. Isotopic labeling experiments with subjects food confirmed that mass is being conserved, and no ecto-entropic phenomena are involved. In the 33 years since SCP-1850 entered Foundation custody, the rate at which its tissue regenerates has decreased by approximately 10%. Seed document 1850-74E for detailed statistical analysis. This is believed to be a natural result of the aging process. As further evidence supporting this hypothesis, radiographic imaging of SCP-1850 has revealed the onset of osteoarthritis. During its tethered flight sessions, SCP-1850 will take off and glide in the manner typical of non-anomalous members of the genus Asipiter. Seed document 1850-4AC-3 for detailed analysis of the anomalous aerodynamic properties it invents. After 20-30 minutes of gliding, or 10 in inclement weather, SCP-1850 will land itself and roll itself back into its hangar. Addendum on ██████ A seismic incident caused structural damage to Site-6, resulting in SCP-1850 breaching containment. Personnel observed it flying free for approximately three minutes after which it returned the containment of its own volition.