noun
Technical term for the undercarriage of an aircraft, including wheels, struts, and related mechanisms.
パイロットは降着装置を下ろして着陸の準備をした。
The pilot lowered the landing gear and prepared for landing.
着陸装置 is a broader term for 'landing device/system', while 降着装置 specifically refers to the physical landing gear assembly.
Compound of 降着 (こうちゃく, 'landing' or 'alighting') and 装置 (そうち, 'device' or 'equipment'). The exact historical derivation is uncertain; the spelling is conventionally associated with aircraft landing gear.